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Data Set

Directory Name in the CD :  USGS_GOLDEN_USA

DATA PARTICULARS

1. There are two sources of data sets from USGS-Golden. Some duplicate data files exist. The user needs to be aware of the similar data in two data sets provided. Therefore, we divided the data sets as DATA SET 1 and DATA SET 2.

2. For DATA SET 1, each new record-file, identified by its name (e.g. 237L1ka.dof), has a short header that indicates, for each of the three components, (a) the component orientation, (b) total length of record, (c) sampling interval, and (d) the unit of motion (cm/s or cm/s/s). The file name indicates the Julian date and time. The last letter, a, before the station identifier (e.g. dof) refers to acceleration. For velocity, this will be , v. [SPECIAL WARNING: DATA SETS: xxxxxxxxxxa.ap1 and yyyyyyyyyya.adp are acceleration data. However during the conversion process, the headers of these data sets are shown as CM/SEC. They should be accepted as CM/SEC/SEC. DATA SETS: xxxxxxxxxv.ap1 and yyyyyyyyyv.adp are velocity data and the headers correctly provide the units as CM/SEC.]

3. For DATA SET 2, the information table is organized from the headers of the records. Components of each record are shown by different extensions on the filename of the record (i.e. .001, .002, etc.). There are two types of records under this folder: 3-channel acceleration or 6- channel acceleration-velocity records. In the 6-channel case, channels 4, 5, and 6 represent the velocity channels.

4. Records that clearly show distinct and clear errors have not been included into the data set. Erroneous recording are described as false triggers, files that contain no signals, and files that have all components clipped or exhibit clear instrumental errors.

5. The original data files were in binary format. The data files were converted into ASCII format using USGS-GOLDEN written software "vec."

6. Each new ASCII data file contains three component of recorded motion for each station and each event. Each component is separated and identifiable from the other two by a small header.

7. Sampling interval for all USGS-Golden data is 0.01 s.

8. No corrections of data signals have been made. Spectral values are not computed or provided.

9. There is a detailed table for each event that shows the stations and instrument characteristics.

10. There is no detailed available geotechnical information related to the USGS-Golden data.

11. The components are described by azimuthal angles. These are shown in the headers as
         000/000 UP-DOWN
         090/000 NORTH-SOUTH
         090/090 EAST-WEST.