HR: 0800h
AN: S11C-0716    [Abstracts]
TI: A study of the unified scaling law of earthquakes in the Taiwan region
AU: * Tsai, C
EM: silence8@ms14.hinet.net
AU: Shieh, C
EM: seifent@eq.ccu.edu.tw
AB: A recently proposed unified scaling law merging (1) Omori Law, (2) Gutenberg-Richter law, and (3) geometrical fractal distribution of epicenters, seems to successfully investigate the occurrence of earthquakes from a spatial- temporal perspective. This study plans to verify important questions arising from the definition of the model by doing three experiments. These experiments aim to: 1. understand the feasibility of applying this scaling law to the intrinsic characteristic seismicity in Taiwan, 2. ascertain the difference between aftershocks and main shocks in a unified scaling law by comparing earthquake time sequences with declustered ones, 3. investigate the differences among the scaling relationships obtained from various geological settings in Taiwan. Our results show that Regardless of the size of the cells and the cut-off magnitude, a distinct and unified scaling law is always obtained from the spatial-temporal occurrence of earthquakes in Taiwan. After declustering, the constant part that indicates the characteristic of the aftershock apparently disappears, and the slope of the fast decaying part that corresponds to the main shock remains almost the same. A Poisson distribution tends to be a better description for the main shock sequences. In addition, the scaling laws obtained from four different sub-regions in Taiwan, though being slightly different from each other, show a similar scaling relationship.
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
SC: Seismology [S]
MN: 2007 Fall Meeting