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United States Earthquake Intensity Database, 1638-1985
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The United States Earthquake Intensity Database is a collection of damage and felt
reports for over 23,000 U.S. earthquakes from 1638-1985. The majority of intensities
are for U.S. cities, but there are also a few earthquakes and intensities for Panama
(1925-1975), the Philippines (1926-1937), and Mexico (1887-1981). The data were compiled
from various publications, newspaper reports, and special catalogs. The annual serial
"United States Earthquakes," is the principal data source and provides 90 percent
of the observations. Most records in the file contain the date and time of occurrence
and location of the earthquake, magnitude, focal depth, two-digit state code, name
and coordinates of observing city or town, the observed intensity at each town, and
the distance from city (or locality) to epicenter. The file consists of more than
150,000 earthquake intensity observations. The data file serves as an important information
source for the preparation of intensity histories that are useful for environmental
and hazard impact statements. The file is static and is no longer being updated.
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GCMD Landing Page |
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NASA Goddard Space Flight Center, Earth Science Data and Information System |
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custodian |
https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords |
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Haz Info |
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NOAA National Centers for Environmental Information |
Hazards Data Manager |
haz.info@noaa.gov |
pointOfContact |
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NCEI (publisher) |
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NOAA National Centers for Environmental Information |
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publisher |
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Anna Milan |
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NOAA National Centers for Environmental Information |
Metadata Specialist |
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editor |
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Neumann, Frank |
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author |
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Nicolas Arcos |
Nicolas Arcos |
DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA,
U.S. Department of Commerce |
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haz.info@noaa.gov |
pointOfContact |
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United States Geological Survey (USGS) |
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originator |
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United States Geological Survey > Earthquakes Hazards Program |
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originator |
https://earthquake.usgs.gov/ |
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Wood, Harry O. |
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author |
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https://earthquake.usgs.gov/ |
United States Geological Survey (USGS) Earthquakes Hazards Program |
The USGS Earthquake Hazards Program is part of the National Earthquake Hazards Reduction
Program (NEHRP), established by Congress in 1977. We monitor and report earthquakes,
assess earthquake impacts and hazards, and research the causes and effects of earthquakes. |
information |
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https://www.earthdata.nasa.gov/learn/find-data/idn/gcmd-keywords |
Global Change Master Directory (GCMD) Keywords |
The information provided on this page seeks to define how the GCMD Keywords are structured,
used and accessed. It also provides information on how users can participate in the
further development of the keywords. |
information |
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https://www.ngdc.noaa.gov/hazard/eq-intensity.shtml |
United States Earthquake Intensity Database |
Descriptive page for the U.S. Earthquake Intensity Database, a collection of intensities
for over 23,000 U.S. earthquakes. The digital database contains information regarding
epicentral coordinates, magnitudes, focal depths, names and coordinates of reporting
cities (or localities), reported intensities, and the distance from city (or locality)
to epicenter. The database file is static and is no longer being updated. |
search |
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https://www.ngdc.noaa.gov/hazard/intintro.shtml |
United States Earthquake Intensity Database, 1638-1985 |
Description of database, definition of variables, history of earthquake intensity
scales, collecting data on earthquake intensity, and references. |
information |
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Latitude |
Distance measured north or south from the equator. Distance north is positive, distance
south is negative. |
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Longitude |
Longitude is measured from the Prime Meridian (which is the north/south line that
runs through Greenwich, England), values measured east are positive and values measured
west are negative. |
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Focal Depth |
The depth of the earthquake is given in kilometers, positive downward. |
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Magnitude |
The value in this column contains the earthquake magnitude, it is usually the Ms magnitude.
The Ms magnitude is the surface-wave magnitude of the earthquake. The magnitude is
a measure of seismic energy. The magnitude scale is logarithmic. An increase of one
in magnitude represents a tenfold increase in the recorded wave amplitude. However,
the energy release associated with an increase of one in magnitude is not tenfold,
but about thirtyfold. For example, approximately 900 times more energy is released
in an earthquake of magnitude 7 than in an earthquake of magnitude 5. Each increase
in magnitude of one unit is equivalent to an increase of seismic energy of about 1.6
x 10,000,000,000,000 ergs. |
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City Name |
The City where the felt report occurred. |
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State |
The State or Province abbreviation where the felt report occurred. |
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Felt Report Latitude |
Distance measured north or south from the equator. Distance north is positive, distance
south is negative. |
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Felt Report Longitude |
Longitude is measured from the Prime Meridian (which is the north/south line that
runs through Greenwich, England), values measured east are positive and values measured
west are negative. |
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Epicentral Distance |
The distance from the earthquake source to the felt report location. |