Seismic Quiescence before the 1999 Chi-Chi, Taiwan, Mw 7.6 Earthquake
Resource
Bulletin of the Seismological Society of America 96 (1): 321-327
Journal
Bulletin of the Seismological Society of America
Journal Volume
96
Journal Issue
1
Pages
321-327
Date Issued
2006
Date
2006
Author(s)
Abstract
The Chi-Chi, Taiwan, earthquake of 20 September 1999 was preceded by a notable decrease of the regional seismicity rate. The anomalous period started in January 1999 and lasted about 9 months, up to the occurrence of the mainshock, as revealed from analyzing the Taiwan catalog data from 1 January 1994 to 20 September 1999. Our results indicate that the mean seismicity rate is 435 events per month with a standard deviation of 78 events for earthquakes with magnitude above 2.0. During the anomalous period, seismicity rates fell outside the range of one standard deviation with a mean value of 314 events per month. There was also a consistent trend of decreasing regional b-value as well as notable increases of seismic activity in areas surrounding the Chi-Chi earthquake source region via the Z-test map (ZMAP) analysis.
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Type
journal article
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