2 Examples of Near-Source Accelerograms in digital files

Prepared by W. H. K. Lee with seismic data kindly provided by Dr. K. W. Kuo, Director of the Seismology Center, Central Weather Bureau (CWB), Taipei, Taiwan and his staff.

Strong-motion records have been retrieved at two stations (TCU078 and TCU129) in the epicentral area (epicentral distance of about 5 and 13 km, respectively). Plots of these two accelerograms (with station coordinates) were given in Report #2. Location of these two stations with respect to the mainshock (23.85N, 120.81E) is shown in Figure 1.

Digital waveform files corresponding to these accelerograms are now available for download. We request that any user using these digital data will acknowledge that the data source is: Seismology Center, Central Weather Bureau, Taipei, Taiwan. Data unit is in digital counts and is stored in 16-bit signed integers (+- 2g = +- 32768 digital counts). Sample rates are 200 samples per second. Please note that time correction has not been applied.

The data files are in given in ASCII form of the PC-SUDS format, and it is self-explanatory. For further information on the PC-SUDS format, please see "PC-SUDS Primer" by Robert Banfill (1994).

Banfill, R., (1994). PC-SUDS Primer, in IASPEI Software Library, Vol. 2, 2^nd Edition,

edited by W. H. K. Lee, Seismological Society of America, El Cerrito, CA, p. 209-221.

Figure 1. Station location map with respect to the epicenter of the Chi-Chi earthquake.