Bulletin of the Seismological Society of America; February 2006; v. 96; no. 1;
p. 321-327; DOI: 10.1785/0120050069
© Seismological Society of America
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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.
