Stress interactions between normal faults and adjacent strike-slip faults of 1997 Jiashi earthquake swarm |
| |
Authors: | Zhang ZhuQi Chen John YongShun Lin Jian |
| |
Institution: | (1) Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing, 100871, China;(2) Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA |
| |
Abstract: | During a 4-month period starting from 21 January, 1997, an earthquake swarm of seven major events (M
s
⩾6.0) struck the Jiashi region at the northwestern corner of the Tarim Basin in Xinjiang,, China. Previous relocation studies
suggested that these strong earthquakes had occurred along at least two parallel rupture zones. According to the relocated
hypocenters and focal mechanisms of the events, we have constructed fault models for these seven earthquakes to calculate
the Coulomb stress changes produced by each of these events. Furthermore, we extended our model calculations to include an
adjacent 1996 M
s
=6.9 Artushi earthquake, which occurred one year before the Jiashi earthquake swarm. Our calculations show that the Coulomb
stress change caused by the preceding events was around 0.05 MPa at the hypocenter of the 4th event, and higher than 0.08
MPa at the hypocenters of the 2nd, 3rd, 5th and 6th events. Our results reveal a Coulomb stress interactive cycle of earthquake
triggering between two adjacent normal and strike-slip faults.
Supported by the National Natural Science Foundation of China (Grant Nos. 40520120222, 40125011 and 40521002) and the United
States National Science Foundation (Grant No. EAR-0003888) |
| |
Keywords: | Jiashi earthquake swarm normal fault strike-slip fault Coulomb stress change earthquake triggering |
本文献已被 SpringerLink 等数据库收录! |
|