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Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1; p. 321-327; DOI: 10.1785/0120050069
© 2006 Seismological Society of America
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Seismic Quiescence before the 1999 Chi-Chi, Taiwan, Mw 7.6 Earthquake

Yih-Min Wu1 and Ling-Yun Chiao2

1 Department of Geosciences
National Taiwan University
No. 1, Sec. 4, Roosevelt Road
Taipei 106, Taiwan
drymwu{at}ntu.edu.tw
 (Y.-M.W.)

2 Institute of Oceanography
National Taiwan University
Taipei, Taiwan
 (L.-Y.C.)


Figure 001
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  		Figure 1. Epicenter distribution of disastrous earthquakes during 1900–1999 in the Taiwan area. These earthquakes may be divided into two general classes: the earthquakes associated with the subduction of the Philippine Sea plate northward under the Eurasia plate, and the ones associated with active faults in western Taiwan.

 

Figure 002
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  		Figure 2. Epicenters of the selected 66,069 events used in this study (open circles). The locations of the seismic stations of the Central Weather Bureau Seismic Network (CWBSN) are marked by solid squares. The epicenter of the Chi-Chi earthquake is depicted by the star, and the solid line marks the surface rupture.

 

Figure 003
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  		Figure 3. The log–log plot of the frequency- magnitude distribution of the selected events (dots). The solid line results from the least-squares regression, and the two dashed lines mark the range of one standard deviation. Magnitude completeness is 2.0 for the CWBSN.

 

Figure 004
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  		Figure 4. (A) Monthly event counts for ML >2.0; (B) monthly b-value variations; (C) monthly events counts for ML >4.0 from 1994 to the occurrence of the Chi-Chi earthquake. The solid line indicates the least-squares mean, and the two dashed lines show the range of one standard deviation.

 

Figure 005
Figure 005
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  		Figure 5. (a) Distribution of the Z-values from 1 January 1999 to 19 September 1999. Most of the Taiwan region is marked by the high positive Z-values that imply seismicity reduction. In contrast, areas surrounding the Chi-Chi earthquake source region have negative Z-values that imply increased activity prior to the main event. (b) Distribution of the Z-values from 1 January 1995 to 31 December 1996 suggests the background seismicity.

 




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