Seismicity characteristics before the 2003 Chengkung, Taiwan, earthquake
Resource
Tectonophysics 457 (3-4): 177-182
Journal
Tectonophysics
Journal Volume
457
Journal Issue
3-4
Pages
177--182
Date Issued
2008-10
Author(s)
Abstract
We investigate the variations in seismicity pattern in the Taiwan region before the 2003 Chengkung, Taiwan, earthquake (Mw = 6.8) by calculating the standard normal deviate of the Z-values and b-values from the Gutenberg-Richter relation. The Mogi donut-shaped variations in the seismicity can be identified in the Z-value map surrounding the Chengkung earthquake source region. Noticeable decreases in the b-values have also been found around the mainshock region before the Chengkung event. The relatively low-seismicity rate and the decrease in the b-values may be the precursory phenomena associated with the quiescence in overall seismicity and the activation of moderate-sized events occurred around the mainshock region before the Chengkung event. © 2008.
Type
journal article
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