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Updated: Jul 7, 2026

Kinematic History of a Salient-recess Junction Explored through a Combined Approach of Field Data and Analog Sandbox Modeling
Published on: August 5, 2016
The chi-Chi earthquake sequence: active, out-of-sequence thrust faulting in taiwan
1Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, Taiwan 115, Republic of China. Department of Geology and Mid-America Earthquake (MAE) Center, University of Illinois, Urbana, IL 61801, USA.
Abstract:
We combined precise focal depths and fault plane solutions of more than 40 events from the 20 September 1999 Chi-Chi earthquake sequence with a synthesis of subsurface geology to show that the dominant structure for generating earthquakes in central Taiwan is a moderately dipping (20 degrees to 30 degrees ) thrust fault away from the deformation front. A second, subparallel seismic zone lies about 15 kilometers below the main thrust. These seismic zones differ from previous models, indicating that both the basal decollement and relic normal faults are aseismic.
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