Earthquakes

Texas Hazard Mitigation Package (THMP)

 

SUMMARY DATA

Data Layer:
Earthquakes: 1882 - 1985
Content:
 Number of earthquakes from 1882 – 1985, summarized by county
Counties categorized into 5 classes using the natural breaks method
Use Notes:

Identify the relative risk of this hazard, as expressed by historical occurrences

Please note that these summarized occurrences (by county) are relative only to Texas. For example, if this data were combined with data from the Western U.S., including California, the resulting map may display all the Texas data categorized in the lowest class.
 
Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:
Data layer was compiled internally, sourced from NOAA / National Geophysical Data Center -- see Earthquake Reports data layer below

 

DETAILED DATA

Data Layer:
Earthquake Reports: 1882 - 1985
Content:
 Reports of earthquakes from 1882 to 1985
Earthquake Reports categorized into 5 classes using the natural breaks method.
Use Notes:

Size and color of symbol denotes the magnitude (not the MMI Scale Intensity) of the reported earthquake.

Note: There may be multiple reports for each earthquake event, which may be reported by different cities.
 
Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

National Geophysical Data Center
www.ngdc.noaa.gov

Direct access to the data layer source:
www.ngdc.noaa.gov/seg/hazard/int_srch.shtml

 

Data Layer:
Earthquake Risk Zones
Content:
 Relative risk areas by ground acceleration associated with earthquakes
Risk areas categorized into 12 classes using the natural breaks method
Use Notes:
 Isolines indicate ground acceleration zones, showing 2% probability of exceedance in 50 years
 
Direct statewide download of this data layer.
User options for downloading this data layer or others by county (or statewide), use the Download Utility
Source:

USGS / Earthquake Hazards Program
earthquake.usgs.gov

Direct access to the data layer source:
earthquake.usgs.gov/hazmaps



 

OTHER MAPS AND DATA

 

Federal Emergency Management Agency (FEMA):
https://hazards.fema.gov/femaportal/wps/portal
Note: Launch Map Viewer and choose Basic or Advanced for earthquake-related data/maps

USGS / Seismic Hazard Map of Texas
earthquake.usgs.gov/regional/states/texas/hazards.php

USGS / Earthquake Hazard Downloadable Data FTP links
earthquake.usgs.gov/research/hazmaps/html/ftpbrow.php
Note: Copy & paste the ftp link onto your browser's Address bar. If you get a login prompt, click on the 'login as anonymous' checkbox.

 

OTHER HAZARD INFO

FEMA / Earthquakes
http://www.fema.gov/hazard/earthquake/index.shtm

FEMA / National Earthquake Hazards Reduction Program (NEHRP)
http://www.fema.gov/plan/prevent/earthquake/nehrp.shtm

UT at Austin / Institute for Geophysics: Earthquake Seismology
www.ig.utexas.edu/research/projects/eq/index.htm

Disaster Help / Earthquakes
https://disasterhelp.gov/portal/jhtml/community.jhtml?community=Earthquake&index=0&id=5