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The main-shock and aftershock records contained
in this CD-ROM compilation presented herein have been obtained
from eight sources. A general description of the sources and the
organizations involved are summarized in Table 1.
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The authors believe that there are additional records
that either are (a) not widely known to exist or (b) not being released
by the owners for one reason or another.
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The number of permanent and temporary stations that
recorded the August 17, 1999 Izmit earthquake main-shock and November
12, 1999 Duzce earthquake main-shock as well as aftershocks and
the total components of data and number of events are summarized
in Table 2. The numbers presented in the table are approximate but
sufficiently accurate.
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Each source of data is obtained by different recorders
and sensors with different binary or ASCII data format (e.g.
USGS-Menlo data is obtained with GEOS recording systems [see
http://nsmp.wr.usgs.gov/geos/]
).
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The variation in instrument types deployed by the
different sources and the resulting variation in data format led
to the decision to provide all data in ASCII format so that the
user does not have to search for or develop converter software.
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The CD-ROM is organized such that the compiled data
and all relevant tabulation of station information from each source
is in a separate directory under the data souce name provided in
Table 1. Within each data source directory, there are sub-directories.
One of the subdirectories in each case contains the zipped or unzipped
ASCII data files.
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For each source of data, a specific file describes
the station identity, coordinates, event time if available, and
absolute peak value of the specific component of motion.
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We have not provided event history. These can be obtained
from other sources.
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Detailed geotechnical description of the stations
are not available in most cases. However, general descriptions,
as provided by the sources are provided in the respective directories
of each source.
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No corrections of data are made. Spectral values are
not computed or provided.
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A general deployment map identifying the different
deployments and therefore data contributors identified by a different
color-code is provided in pdf format. This map is based on the general
station information table prepared using commercially available
public-domain software, Excel (
ALL_SOURCES_STATIONS_INFO.xls). This map can be magnified with
the magnifier tool of Adobe Acrobat to get a quick understanding
of the relative locations of the stations from the different sources
of data identified by a different color.
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Similarly, for each data source, one or more detailed
maps are provided in pdf and other formats
