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Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms, 1933-1994
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The Strong Motion Earthquake Data Values of Digitized Strong-Motion Accelerograms
is a database of over 15,000 digitized and processed accelerograph records from 1933
to 1994. Data were obtained from a variety of structural and geologic environments.
Most of the data are available in three levels of processed files. The first type
of file contains raw (uncorrected) time, history data points digitized from the analog
accelerogram. The second is a filtered, instrument corrected version of the time,
history data. This file also contains calculated velocities and displacements obtained
by the integration and double integration of the corrected accelerations. The third
type of file includes the calculated Fourier and response spectra data. The data are
from the United States, Algeria, Argentina, Armenia, Australia, Bulgaria, Canada,
Chile, China, El Salvador, Fiji, Germany, Greece, India, Iran, Italy, Japan, Mexico,
New Zealand, Nicaragua, Papua New Guinea, Peru, Portugal, Romania, Spain, Taiwan,
Turkey, and Uzbekistan. This database is static and is no longer being updated.
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Earthquake Name |
The name of the earthquake, usually associated with the geographic location, such
as Valparaiso Earthquake. |
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State |
The State abbreviation where the earthquake occurred. |
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Country |
The Country where the earthquake occurred. |
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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. The type of magnitude
(Ms, mb, etc.) is in the Mag Type column. The magnitude is a number that characterizes
the relative size of an earthquake. Magnitude is based on measurement of the maximum
motion recorded by a seismograph. Several scales have been defined, but the most commonly
used in the earthquake strong motion database are local magnitude (ML), commonly referred
to as "Richter magnitude," surface-wave magnitude (Ms), and body-wave magnitude (Mb). |
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Station Name |
The name of the acclerograph station. |
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Station Latitude |
Distance measured north or south from the equator. Distance north is positive, distance
south is negative. |
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Station 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 accelerograph station location. |
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Component |
Description not provided. |
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Floor |
The Floor number where the accelerograph is located. -1 is the basement and 99 is
the roof. |
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Site Geology |
The site geology of the accelerograph station. |
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Uncorrected Acceleration |
The peak uncorrected or raw acceleration value in cm/sec2. The term "uncorrected"
indicates that a digitized or digitally recorded time series has received no processing
that involves any hypotheses as to the character or frequency content of the ground
motions or recording instruments. An "uncorrected" analog-recorded time series has
been corrected only for uneven film transport with time, for transverse motion of
the film as it moved longitudinally through the recorder, and for angular tilts between
the baselines of adjacent scan segments of long records. Time series derived from
both analog and digitally recorded data have been shifted to have zero mean; and have
been converted from digitization units or volts to units of cm/sec/sec (ordinates)
and seconds (abscissas). |
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Corrected Acceleration |
The peak corrected acceleration value in cm/sec2. The "correction" process may apply
baseline corrections, bandpass filters (removing noise contamination) and instrument
correction (as necessary, to remove the effects of frequency-dependent instrument
response) to a time series. |
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Maximum Velocity |
The maximum velocity in cm/sec. For analog data and some of the digitally recorded
data, the velocity time series are derived by integrating the corrected acceleration
time series. For some digitally recorded data, the velocity is derived by integrating
the baseline-corrected but unfiltered acceleration time series and then filtering
the velocity. |
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Maximum Displacement |
The maximum displacement in cm. For analog data and some of the digitally recorded
data, the displacement time series are derived by integrating the velocity time series.
For some of the digitally recorded data, the displacement time series are derived
by doubly integrating the baseline-corrected but unfiltered acceleration time series
and then filtering the displacement. |
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Uncorrected Tape |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |
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Uncorrected File |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |
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Corrected Tape |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |
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Corrected File |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |
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Response Tape |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |
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Response File |
All of the digitized strong motion data are arranged into sets grouped by either triggering
events or geographic regions. These sets are identified by a particular data set number
(such as SM-USACA01 or SM-TAI04). Most of the data sets include three types of processed
records: uncorrected (raw), corrected (filtered), and response spectra (includes Fourier
spectra). Each data set is distributed with documentation containing (when available)
information on the triggering earthquakes, recording stations, record processing procedures,
and data format. These data were originally available on a three-volume CD collection.
The contents of each volume are available for download. The UNC TAPE column indicates
the directory the dataset of interest is located. The datasets are listed in the /data
directory and the files are located in the /records directory under the dataset directory.
The UNC FILE column indicates the file number for a particular record. Volume 1: California
records for 1933-1988, Montana, Nevada, and Washington records Volume 2: California
records for 1989-1994 and all other non-California USA records Volume 3: Non-USA records |