Relocation of the Yushu MS7.1 Earthquake Sequence and Investigation on Its Seismotectonics
详细信息
- 责任者：Zhu Ailan (Earthquake Administration of Shanghai Municipality ; Shanghai 200062 ; China) ; Xu Xiwei
- 刊名：Earth Science Frontiers
- 出版年：2012
- 卷期：19(4)
- 关键词：地震序列 ; seismic sequence ; 地震定位 ; seismic location ; Yushu earthquake 2010 ; Qinghai Province
- 页码：p.8-14
- 图表：3 illus., 12 refs.
- 分类号：0500
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
The authors investigated the seismotectonics of the Yushu Ms7.1 earthquake by relocating the 1 670 earthquakes in its sequence from April 11 to September 15, 2010 using the double difference algorithm. Most of the relocated hypocentral depths are between 0 and 15 km. The focal mechanism solutions of the mainshock and some large aftershocks suggest that the seismic faulting along the segment with surface rupture to be pure sinistral strike slip, whereas to the northwestern end, the rupture mechanism might be different from that of the mainshock, the wide seismic belt there might be formed by a conjugate rupture. It can be concluded that the aftershocks occurred after a time period were triggered in the process of stress adjustment, and not constrained inside the rupture zone created by the mainshock.