U.S. Geological Survey





Preparation Team

General Comments

Data Sources



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  1. 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.

  2. 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.

  3. 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.

  4. 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/] ).

  5. 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.

  6. 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.

  7. 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.

  8. We have not provided event history. These can be obtained from other sources.

  9. 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.

  10. No corrections of data are made. Spectral values are not computed or provided.

  11. 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.

  12. Similarly, for each data source, one or more detailed maps are provided in pdf and other formats