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Significant United States Earthquakes 1568 - 2004 Shapefile Metadata

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<-- Significant United States Earthquakes Description and Download

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Identification_Information:
Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 200501
Title: Significant United States Earthquakes, 1568-2004
Publication_Information:
Publication_Place: Reston, VA
Publisher: National Atlas of the United States
Online_Linkage:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>

Description:
Abstract:
This map layer contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological effects, or were otherwise experienced by populations in the United States, Puerto Rico, and U.S. Virgin Islands. Included are earthquakes located in the United States as well as some that occurred in adjacent portions of Canada and Mexico. The main sources for the data are Seismicity of the United States, 1568-1989 and the Preliminary Determination of Epicenters for 1990 to January 2004. This is a replacement for the June 1999 map layer.

Purpose:
These data are intended for geographic display and analysis at the national level, and for large regional areas. The data should be displayed and analyzed at scales appropriate for 1:2,000,000-scale data. No responsibility is assumed by the National Atlas of the United States or the U.S. Geological Survey in the use of these data. This map layer is intended for a mixed audience of specialists and non-specialists alike who have a need for general, non-technical information about significant United States earthquakes.

Supplemental_Information:
Provided with the downloadable files is a text file, quksigx_references.txt, which contains the reference information for earthquake magnitudes listed in the data.

Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 15680101
Ending_Date: 20040131
Currentness_Reference: Ground condition

Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed

Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: 143
East_Bounding_Coordinate: -60
North_Bounding_Coordinate: 65
South_Bounding_Coordinate: 10
Keywords:
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: geoscientificInformation

Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: Earthquakes
Theme_Keyword: Seismic events
Theme_Keyword: Magnitude
Theme_Keyword: Body wave magnitude
Theme_Keyword: Surface wave magnitude
Theme_Keyword: Modified Mercalli Intensity Scale

Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard 10-4): Washington, DC, National Institute of Standards and Technology.
Place_Keyword: United States
Place_Keyword: Canada
Place_Keyword: Mexico
Place:
Place_Keyword_Thesaurus: None
Place_Keyword: USA
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.
Place_Keyword: Alabama
Place_Keyword: Alaska
Place_Keyword: Arizona
Place_Keyword: Arkansas
Place_Keyword: California
Place_Keyword: Colorado
Place_Keyword: Connecticut
Place_Keyword: Delaware
Place_Keyword: District of Columbia
Place_Keyword: Florida
Place_Keyword: Georgia
Place_Keyword: Hawaii
Place_Keyword: Idaho
Place_Keyword: Illinois
Place_Keyword: Indiana
Place_Keyword: Iowa
Place_Keyword: Kansas
Place_Keyword: Kentucky
Place_Keyword: Louisiana
Place_Keyword: Maine
Place_Keyword: Maryland
Place_Keyword: Massachusetts
Place_Keyword: Michigan
Place_Keyword: Minnesota
Place_Keyword: Mississippi
Place_Keyword: Missouri
Place_Keyword: Montana
Place_Keyword: Nebraska
Place_Keyword: Nevada
Place_Keyword: New Hampshire
Place_Keyword: New Jersey
Place_Keyword: New Mexico
Place_Keyword: New York
Place_Keyword: North Carolina
Place_Keyword: North Dakota
Place_Keyword: Ohio
Place_Keyword: Oklahoma
Place_Keyword: Oregon
Place_Keyword: Pennsylvania
Place_Keyword: Rhode Island
Place_Keyword: South Carolina
Place_Keyword: South Dakota
Place_Keyword: Tennessee
Place_Keyword: Texas
Place_Keyword: Utah
Place_Keyword: Vermont
Place_Keyword: Virginia
Place_Keyword: Washington
Place_Keyword: West Virginia
Place_Keyword: Wisconsin
Place_Keyword: Wyoming
Place_Keyword: Puerto Rico
Place_Keyword: Virgin Islands
Place_Keyword: U.S. Virgin Islands
Place_Keyword: Guam
Place_Keyword: Northern Mariana Islands

Access_Constraints: None
Use_Constraints:
None. Acknowledgment of the National Atlas of the United States of America and (or) the U.S. Geological Survey would be appreciated in products derived from these data.

Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Margaret G. Hopper

Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: Mailing address
Address: MS966, Box 25046, Denver Federal Center
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-273-8564
Contact_Facsimile_Telephone: 303-273-8600
Contact_Electronic_Mail_Address: hopper@usgs.gov

Data_Set_Credit:
The following U.S. Geological Survey scientists contributed to this map layer: A. Tarr, M. Hopper, J. Dewey, M. McKeever, and N. Trevor.


Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The attribute table was manually checked for unreasonable attribute values for depth and magnitude.
Logical_Consistency_Report:
No formal tests for logical consistency were performed on this map layer, principally because the map layer contains attribute values that were arrived at by either or both quantitative (i.e. instrumental) and qualitative (i.e. historical) methods. Earthquakes that occurred prior to the introduction of seismological instrumentation are known only from written records, such as newspapers, books and journals, and diaries, which often may provide contradictory information that has to be carefully examined and weighed. As seismographs became more common in the early 1960's, the origin time and location were both more precisely and accurately determined but the compilation and evaluation of intensity reports was, and still is, a process that involves considerable subjectivity. As a result, all attributes associated with a given earthquake should be considered provisional and subject to further revision based on acquisition of new information and use of new analytical methods.
Completeness_Report:
This map layer contains information on significant, historical earthquakes that caused deaths, property damage, geological effects, or that were experienced by populations in the epicentral area, for the United States, Puerto Rico, the U.S. Virgin Islands, Guam, and the Northern Mariana Islands. These data are limited to the best estimates of earthquake locations and to attributes such as magnitude and maximum intensity.

Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
100 meter is the nominal precision of the reported instrumentally located coordinate values but accuracy is considerably less. Accuracy depends upon numerous factors including imprecision of the velocity model of the earth, uneven distribution of seismic stations, and imprecisions in the computational algorithm. Following initial proofreading of the input data file, a preliminary map of the locations of the earthquakes was produced which was examined for gross errors in spatial location.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report:
Although depths are reported to the nearest 1 kilometer, the accuracy is considerably less owing to uncertainties in the velocity model of the Earth, uneven distribution of seismic stations, and imprecisions in the computational algorithm.

Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Stover, Carl W.
Originator: Coffman, Jerry L.
Publication_Date: 1993
Title: Seismicity of the United States, 1568-1989 (Revised)
Edition: 1
Online_Linkage: <http://neic.usgs.gov/neis/epic/>
Series_Information:
Series_Name: Professional Paper
Issue_Identification: 1527
Publication_Information:
Publication_Place: Washington, DC
Publisher: U.S. Geological Survey
Type_of_Source_Media: Paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1568
Ending_Date: 1989
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: Seismicity of the United States
Source_Contribution:
Principal source of earthquake locations and attributes.

Source_Information:
Source_Citation:
Citation_Information:
Originator: U.S. Geological Survey
Publication_Date: 200411
Title: Preliminary Determination of Epicenters (PDE)
Online_Linkage: <http://neic.usgs.gov/neis/epic/>
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1973
Ending_Date: 20040131
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: PDE
Source_Contribution:
Supplemental source of earthquake locations and attributes.

Source_Information:
Source_Citation:
Citation_Information:
Originator: J.L. Coffman (ed.)
Originator: C.A. von Hake (ed.)
Originator: C.W. Stover (ed.)
Publication_Date: 1982
Title: Earthquake History of the United States
Publication_Information:
Publication_Place: Boulder, CO
Publisher:
National Oceanic and Atmospheric Administration and U.S. Geological Survey
Type_of_Source_Media: Paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1638
Ending_Date: 1980
Source_Currentness_Reference: Ground condition
Source_Citation_Abbreviation: EHUS1982
Source_Contribution:
Supplemental source of earthquake locations and attributes.

Source_Information:
Source_Citation:
Citation_Information:
Originator: J.G. Tanner
Originator: J.B. Shepherd
Publication_Date: 1997
Title:
Project catalogue and seismic hazard maps, Seismic hazard in Latin America and the Caribbean
Online_Linkage: <http://midas.uprm.edu>
Type_of_Source_Media: Online
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1997
Source_Currentness_Reference: Publication date
Source_Citation_Abbreviation: MIDAS-IPGH
Source_Contribution:
Supplemental source of earthquake locations and attributes.

Process_Step:
Process_Description:
Data for the years 1568 to 1989, from Seismicity of the United States, were combined with Preliminary Determination of Epicenters data for 1990 to 2004. EHUS1982 and MIDAS-IPGH were used to compile information for additional locations or for years not covered by the other sources. The resulting text file was loaded into ArcView and converted to a shapefile. Three records for Puerto Rico were dropped because they did not include values for longitude and latitude.
Source_Used_Citation_Abbreviation: Seismicity of the United States
Source_Used_Citation_Abbreviation: PDE
Source_Used_Citation_Abbreviation: EHUS1982
Source_Used_Citation_Abbreviation: MIDAS-IPGH
Process_Date: 200411


Spatial_Data_Organization_Information:
Indirect_Spatial_Reference:
U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.

Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 5351


Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000278
Longitude_Resolution: 0.000278
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: GRS1980
Semi-major_Axis: 6378137.0
Denominator_of_Flattening_Ratio: 298.257222


Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
Significant United States Earthquakes (described by Quksigx020.dbf)
Entity_Type_Definition:
Earthquakes within or near to the United States that caused deaths, property damage, or geological effects, or that were experienced by populations in the epicentral area. These events occurred between 1568 and January 2004.
Entity_Type_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Shape
Attribute_Definition: The representation of the entity in the data.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Point
Enumerated_Domain_Value_Definition: 0-dimensional element
Enumerated_Domain_Value_Definition_Source: ESRI GIS software
Attribute:
Attribute_Label: Quksigx020
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 5387
Attribute:
Attribute_Label: Quake_id
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 5390
Attribute:
Attribute_Label: Year
Attribute_Definition: The year when the earthquake occurred.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1568
Range_Domain_Maximum: 2004
Attribute:
Attribute_Label: Month
Attribute_Definition: The month when the earthquake occurred.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 12
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: The month of the event is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Day
Attribute_Definition: The day when the earthquake occurred.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 31
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: The day of the event is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Hour
Attribute_Definition:
The GMT hour of the day when the earthquake occurred, on a 24-hour clock.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 23
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: The hour of the event is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Minute
Attribute_Definition: The minute of the hour when the earthquake occurred.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 59
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: The minute of the event is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Second
Attribute_Definition: The second of the minute when the earthquake occurred.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0.010
Range_Domain_Maximum: 59.970
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999.000
Enumerated_Domain_Value_Definition: The second of the event is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Location
Attribute_Definition:
The name of the town, city, physical feature, or other describable location near to the earthquake event.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Unrepresentable_Domain: There is no predefined set of valid location names.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition: No location description is available.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Longitude
Attribute_Definition: The longitude of earthquake's epicenter in decimal degrees.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -179.990
Range_Domain_Maximum: 180.000
Attribute:
Attribute_Label: Latitude
Attribute_Definition: The latitude of earthquake's epicenter in decimal degrees.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 12.686
Range_Domain_Maximum: 68.689
Attribute:
Attribute_Label: Depth_km
Attribute_Definition:
The depth of earthquake's focus in kilometers. A value of 0 may indicate the depth is unknown.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 274
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999
Enumerated_Domain_Value_Definition: The depth is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Mb_gs
Attribute_Definition:
The body wave magnitude of the earthquake as reported by the U.S. Geological Survey. A body wave is a seismic wave that travels through the Earth's inner layers.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.400
Range_Domain_Maximum: 7.000
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999.000
Enumerated_Domain_Value_Definition: The body wave magnitude is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Ms_gs
Attribute_Definition:
The surface wave magnitude of the earthquake as reported by the U.S. Geological Survey. A surface wave is a seismic wave that travels along the Earth's surface.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3.100
Range_Domain_Maximum: 8.500
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999.000
Enumerated_Domain_Value_Definition: The surface wave magnitude is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Other_mag1
Attribute_Definition:
The magnitude of the earthquake as reported by the source identified in Ref1. The type of magnitude is described by the attribute Type1.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.080
Range_Domain_Maximum: 9.240
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999.000
Enumerated_Domain_Value_Definition: No additional magnitude measurement is available.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Type1
Attribute_Definition:
The type of magnitude recorded in the attribute Other_mag1, as defined by the source identified in Ref1.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: FA
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is an estimated body wave magnitude. It is commonly computed from the felt area for earthquakes which occurred before seismic instruments were in general use.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MD
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is based on the duration or coda length of the earthquake vibration.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ML
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the local magnitude, which is also known as the original "Richter" magnitude.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MW
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the moment magnitude. It is the measure of total energy released by an earthquake.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mn
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the local or regional magnitude. It is the body wave magnitude using the Lg wave.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ms
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the surface wave magnitude. A surface wave is a seismic wave that travels along the Earth's surface.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mw
Enumerated_Domain_Value_Definition: The magnitude given in Other_mag1 is the moment magnitude.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: UK
Enumerated_Domain_Value_Definition:
The magnitude type for the magnitude given in Other_mag1 is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mb
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the body wave magnitude. A body wave is a seismic wave that travels through the Earth's inner layers.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mbLg
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag1 is the local or regional magnitude. It is the body wave magnitude using the Lg wave.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition:
The type of magnitude given in Other_mag1 is unknown. The value came from Coffman, Jerry L., and von Hake, Carl A., 1973, Earthquake History of the United States: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Publication 41-1, Revised Edition (Through 1970).
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Ref1
Attribute_Definition:
A code identifying the source for the magnitude given in Other_mag1. The list of sources is provided in the text file quksigx_references.txt.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Unrepresentable_Domain: There is no predefined set of valid reference codes.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition: No reference information is available.
Enumerated_Domain_Value_Definition_Source:
National Atlas of the United States

Attribute:
Attribute_Label: Other_mag2
Attribute_Definition:
The magnitude of the earthquake as reported by the source identified in Ref2. The type of magnitude is described by the attribute Type2.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.900
Range_Domain_Maximum: 8.400
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: -9999.000
Enumerated_Domain_Value_Definition: No additional magnitude measurement is available.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Type2
Attribute_Definition:
The type of magnitude recorded in the attribute Other_mag2, as defined by the source identified in Ref2.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: FA
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is an estimated body wave magnitude. It is commonly computed from the felt area for earthquakes which occurred before seismic instruments were in general use.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MD
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is based on the duration or coda length of the earthquake vibration.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ME
Enumerated_Domain_Value_Definition:

The magnitude given in Other_mag2 is the energy magnitude which is the radiated energy of the earthquake.

Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ML
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the local magnitude, which is also known as the original "Richter" magnitude.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MW
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the moment magnitude. It is the measure of total energy released by an earthquake.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mn
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the local or regional magnitude. It is the body wave magnitude using the Lg wave.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Ms
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the surface wave magnitude. A surface wave is a seismic wave that travels along the Earth's surface.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Mw
Enumerated_Domain_Value_Definition: The magnitude given in Other_mag2 is the moment magnitude.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: UK
Enumerated_Domain_Value_Definition:
The magnitude type for the magnitude given in Other_mag2 is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mb
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the body wave magnitude. A body wave is a seismic wave that travels through the Earth's inner layers.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: mbLg
Enumerated_Domain_Value_Definition:
The magnitude given in Other_mag2 is the local or regional magnitude. It is the body wave magnitude using the Lg wave.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition:
The type of magnitude given in Other_mag2 is unknown. The value came from Coffman, Jerry L., and von Hake, Carl A., 1973, Earthquake History of the United States: U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Publication 41-1, Revised Edition (Through 1970).
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Ref2
Attribute_Definition:
A code identifying the source for the magnitude given in Other_mag2. The list of sources is provided in the text file quksigx_references.txt.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Unrepresentable_Domain: There is no predefined set of valid references.
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition: No reference information is available
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Mmio
Attribute_Definition:
Modified Mercalli Intensity (MMI), where the integer value represents the Roman numeral designation of the MMI intensity.
Attribute_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: F
Enumerated_Domain_Value_Definition:
The earthquake was felt but no Modified Mercalli Intensity was assigned.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
An earthquake felt only by a few persons at rest, especially on upper floors of buildings. Delicately suspended objects may swing.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition:
An earthquake felt quite noticeably by persons indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibration similar to the passing of a truck. Duration estimated in some cases.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
An earthquake felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
An earthquake felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
An earthquake felt by all; many frightened. Some heavy furniture moved; a few instances of fallen plaster. Damage slight.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition:
An earthquake causing negligible damage in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken. Noticed by persons driving motor cars.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 8
Enumerated_Domain_Value_Definition:
An earthquake causing slight damage in specially designed structures; considerable in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 9
Enumerated_Domain_Value_Definition:
An earthquake causing considerable damage in specially designed structures; well-designed frame structures thrown out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 10
Enumerated_Domain_Value_Definition:
An earthquaking causing destruction of some well-built wooden structures; most masonry and frame structures destroyed with foundations. Railroad rails bent.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 11
Enumerated_Domain_Value_Definition:
An earthquake where few, if any (masonry) structures remain standing. Bridges destroyed. Railroad rails bent greatly.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 12
Enumerated_Domain_Value_Definition:
An earthquake where damage is total. Lines of sight and level distorted. Objects thrown into the air.
Enumerated_Domain_Value_Definition_Source: <http://neic.usgs.gov/neis/epic/mm_scale.html>
Attribute:
Attribute_Label: Felt_area
Attribute_Definition:
The area, in square kilometers, in which the earthquake was felt.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: <1,000
Range_Domain_Maximum: 5,000,000
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: <Blank>
Enumerated_Domain_Value_Definition: The area in which the earthquake was felt is unknown.
Enumerated_Domain_Value_Definition_Source: National Atlas of the United States
Attribute:
Attribute_Label: Source
Attribute_Definition: The primary source of the earthquake information.
Attribute_Definition_Source: National Atlas of the United States
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: EHUS1982
Enumerated_Domain_Value_Definition:
Coffman, J.L., von Hake, C.A., and Stover, C.W., 1982, Earthquake History of the United States: U.S. National Oceanic and Atmospheric Administration and U.S. Geological Survey, Publication No. 41-1, revised edition, [through 1980], 258p.
Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: MIDAS-IPGH
Enumerated_Domain_Value_Definition:
Tanner, J.G. and Shepherd, J.B., 1997, Project catalogue and seismic hazard maps, Seismic hazard in Latin America and the Caribbean: Panamerican Institute of Geography and History, v. 1, 143 p.
Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: PDE
Enumerated_Domain_Value_Definition:
Preliminary Determination of Epicenters, a list of earthquakes located by the National Earthquake Information Center of the U.S. Geological Survey and its predecessors in the U.S. Coast and Geodetic Survey, the National Oceanic Survey, and the Environmental Research Laboratories of the Department of Commerce. The PDE is comprised of final hypocenter and magnitude computations by the USGS NEIC published in monthly lists several months after the events.
Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SUS
Enumerated_Domain_Value_Definition:
Stover, Carl W., and Coffman, Jerry L., 1993a, Seismicity of the United States, 1568-1989 (Revised): U.S. Geological Survey Professional Paper 1527, 418 p.
Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey

Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: Earth Science Information Center, U.S. Geological Survey
Contact_Address:
Address_Type: Mailing address
Address: 507 National Center
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
Contact_Voice_Telephone: 703-648-5920
Contact_Instructions:
In addition to the address above there are other ESIC offices throughout the country. A full list of these offices is at <http://ask.usgs.gov/esic_index.html>.

Distribution_Liability:
Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. No responsibility is assumed by the U.S. Geological Survey in the use of these data.

Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ESRI Shapefile
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Digital_Form:
Digital_Transfer_Information:
Format_Name: SDTS
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
<http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
Fees:
There is no charge for the map layer.


Metadata_Reference_Information:
Metadata_Date: 20060620
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Gita Urban-Mathieux
Contact_Organization: National Atlas of the United States
Contact_Address:
Address_Type: Mailing address
Address: 12201 Sunrise Valley Dr
Address: MS 561
City: Reston
State_or_Province: VA
Postal_Code: 20192
Contact_Voice_Telephone: 703-648-5175
Contact_Electronic_Mail_Address: atlasmail@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Security_Information:
Metadata_Security_Classification_System: None
Metadata_Security_Classification: Unclassified
Metadata_Security_Handling_Description: None

<-- Download ArcGIS Shapefiles
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<-- Significant United States Earthquakes Description and Download

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This data may come from a variety of U.S. government and self-reporting private sources. While we try to assure the accuracy of this material, we cannot promise that it is absolutely accurate. We do promise that using the map layer will be fun, entertaining or educational. Beyond this, we make no guarantee as to its suitability for any purpose. We assume no liability or responsibility for errors or inaccuracies. Please understand that you use these map layers at your own risk.

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