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Static Coulomb stress changes on faults caused by the 2008 Mw 7.9 Wenchuan, China earthquake
| Content Provider | Semantic Scholar |
|---|---|
| Author | Wan, Yongge Shen, Zheng-Kang |
| Copyright Year | 2010 |
| Abstract | Abstract The 12 May 2008 Mw 7.9 Wenchuan earthquake has changed the regional tectonic stress field significantly. It is important to know how such a change affects the tectonic loading processes of the faults and therefore the seismic potential of the region. Utilizing the slip distribution of the Wenchuan earthquake as the driving source we compute the changes of Coulomb failure stress ( CFS ) on the neighborhood faults assuming a friction coefficient of 0.4. Our results show that the CFS s have increased on average 1.6 × 10 4 and 1.8 × 10 4 Pa at the SW and NE ends of the Longmen Shan, 2.6 × 10 4 Pa at the western segment of the Qinling Southern Frontal, 2.0 × 10 4 Pa at the northernmost part of the Longriba, 1.4 × 10 4 Pa at the southernmost part of the Xianshuihe, 1.3×10 4 Pa at the southeast end of the East Kunlun, 9.0 × 10 3 Pa at the southernmost part of the Minjiang, 2.9 × 10 3 Pa at the Baiyu, and 3.5 × 10 3 Pa at the Longxian–Baoji faults. Recurring times of these faults are advanced, about 39 and 230 years for the SW and NE segments of the Longmen Shan, ∼ 5.5 years toward the east end of the East Kunlun, and ∼ 1.6 years for the SE segments of the Xianshuihe faults. The quake also relaxed the CFS significantly on most part of the Minjiang, southwest segment of the Longriba, northwest segment of the Xianshuihe, southeast segment of the Yushu–Maqu, north part of the Xiaojinhe, Daliangshan, and Anninghe faults, with the CFS reductions ranging on average of 1.8 × 10 4 , 2.5 × 10 4 , 7.1 × 10 3 , 2.4 × 10 3 , 1.0 × 10 3 , 1.0 × 10 3 , and 1.6 × 10 3 Pa, respectively. Recurring times of these faults are delayed, up to 185 years for the south segment of the Minjiang, up to 18 years for the northeast of the Longriba, up to 9.8 years for the West Qinling Northern Frontal, and up to 2.7 years for the northwest segment of the Xianshuihe faults, respectively. We test sensitivity of the changes of CFS to variations of apparent fiction coefficient μ ′, and find that the senses of CFS change are almost invariant with μ ′ except at the Minjiang, Longriba, and Qinling Southern Frontal faults, where large normal stresses on faults induced by the Wenchuan earthquake could play an important role in manifesting CFS change when μ ′ is large. The CFS changes vary slowly along seismogenic depth on most of the receiver faults. |
| Starting Page | 105 |
| Ending Page | 118 |
| Page Count | 14 |
| File Format | PDF HTM / HTML |
| DOI | 10.1016/j.tecto.2010.03.017 |
| Volume Number | 491 |
| Alternate Webpage(s) | http://scec.ess.ucla.edu/~zshen/publ/tectonophys10wan.pdf |
| Alternate Webpage(s) | https://doi.org/10.1016/j.tecto.2010.03.017 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
