Systematic correlations of the earthquake frequency-magnitude distribution with the deformation and mechanical regimes in the Taiwan orogen
Journal
Geophysical Research Letters
Journal Volume
43
Journal Issue
10
Pages
5017
Date Issued
2016-01-01
Author(s)
Abstract
©2016. American Geophysical Union. All Rights Reserved. We investigate the correlation of the earthquake frequency-magnitude distribution with the style of faulting and stress in Taiwan. The b values estimated for three types of focal mechanisms show significant differences with the lowest for thrust, intermediate for strike slip, and highest value for normal events, consistent with those found in global and other regional seismicity. Lateral distribution of the b values shows a good correlation with the predominant faulting mechanism, crustal deformation, and stress patterns. The two N-S striking thrust zones in western and eastern Taiwan under the larger E-W shortening and differential stress yield the lower b values than those in the in-between mountain ranges subject to the smaller extensional stress and dominated by strike slip and normal faults. The termination of the monotonically decreasing b value with depth at ~15–20 km corroborates its inverse relationship with stress and the existence of the brittle-plastic transition in the weak middle crust beneath the Taiwan orogen.
Subjects
brittle-plastic transition | earthquake frequency-magnitude distribution | stress-dependent b value | Taiwan orogen
Publisher
AMER GEOPHYSICAL UNION
Type
journal article
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