spatiotemporalruptureprocessofthe2008greatwenchuanearthquake
文献类型：期刊论文
| 作者 | ZHANG Yong1 ; FENG WanPeng2; XU LiSheng2; ZHOU ChengHu3; CHEN YunTai1
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| 刊名 | scienceinchinaseriesdearthsciences
 |
| 出版日期 | 2009 |
| 卷号 | 52期号:2页码:145 |
| ISSN号 | 1006-9313 |
| 英文摘要 | Focal mechanism and dynamic rupture process of the Wenchaun M (s)8.0 earthquake in Sichuan province on 12 May 2008 were obtained by inverting long period seismic data from the Global Seismic Network (GSN), and characteristics of the co-seismic displacement field near the fault were quantitatively analyzed based on the inverted results to investigate the mechanism causing disaster. A finite fault model with given focal mechanism and vertical components of the long period P-waves from 21 stations with evenly azimuthal coverage were adopted in the inversion. From the inverted results as well as aftershock distribution, the causative fault of the great Wenchuan earthquake was confirmed to be a fault of strike 225A degrees/dip 39A degrees/rake 120A degrees, indicating that the earthquake was mainly a thrust event with right-lateral strike-slip component. The released scalar seismic moment was estimated to be about 9.4x10(20)-2.0x10(21) Nm, yielding moment magnitude of M (w)7.9-8.1. The great Wenchuan earthquake occurred on a fault more than 300 km long, and had a complicated rupture process of about 90 s duration time. The slip distribution was highly inhomogeneous with the average slip of about 2.4 m. Four slip-patches broke the ground surface. Two of them were underneath the regions of Wenchuan-Yingxiu and Beichuan, respectively, with the first being around the hypocenter (rupture initiation point), where the largest slip was about 7.3 m, and the second being underneath Beichuan and extending to Pingwu, where the largest slip was about 5.6 m. The other two slip-patches had smaller sizes, one having the maximum slip of 1.8 m and lying underneath the north of Kangding, and the other having the maximum slip of 0.7 m and lying underneath the northeast of Qingchuan. Average and maximum stress drops over the whole fault plane were estimated to be 18 MPa and 53 MPa, respectively. In addition, the co-seismic displacement field near the fault was analyzed. The results indicate that the features of the co-seismic displacement field were coincident with those of the intensity distribution in the meizoseismal area, implying that the large-scale, large-amplitude and surface-broken thrust dislocation should be responsible for the serious disaster in the near fault area. |
| 资助项目 | [National Basic Research Program of China] ; [National Natural Science Foundation of China] |
| 语种 | 英语 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/126102]  |
| 专题 | 中国科学院地理科学与资源研究所 |
| 作者单位 | 1.北京大学 2.Institute of Geophysics, China Earthquake Administration 3.中国科学院地理科学与资源研究所 |
| 推荐引用方式 GB/T 7714 | ZHANG Yong,FENG WanPeng,XU LiSheng,et al. spatiotemporalruptureprocessofthe2008greatwenchuanearthquake[J]. scienceinchinaseriesdearthsciences,2009,52(2):145. |
| APA | ZHANG Yong,FENG WanPeng,XU LiSheng,ZHOU ChengHu,&CHEN YunTai.(2009).spatiotemporalruptureprocessofthe2008greatwenchuanearthquake.scienceinchinaseriesdearthsciences,52(2),145. |
| MLA | ZHANG Yong,et al."spatiotemporalruptureprocessofthe2008greatwenchuanearthquake".scienceinchinaseriesdearthsciences 52.2(2009):145. |
入库方式： OAI收割
来源：地理科学与资源研究所
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