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2017年四川九寨沟MS7.0地震及余震定位研究
徐旭1, 徐锦承2, 张伟2
1.中国科学技术大学, 地球和空间科学学院, 合肥 230026;2.南方科技大学, 地球与空间科学系(深圳市深远海油气勘探技术重点实验室), 广东深圳 518055
摘要:
采用特定震源台站校正定位方法对九寨沟MS7.0地震及其余震进行了精定位研究,结果显示九寨沟地震主震深度为19km左右,余震主要分布于5~15km深度范围;与单事件定位方法相比,其余震展布和断层的线性特征更吻合,更具有平面特征;与双差定位法相比,精定位事件覆盖范围更广。精定位结果显示,断层整体为虎牙断裂西北向的延伸,根据余震分布和特定震源区的校正项分布,认为此发震断层应分南、北两段;余震区长度为40km左右,西北段宽度为10km左右,东南段宽度为6.5km左右。
关键词:  特定震源台站校正  九寨沟地震  余震分布  发震断层
DOI:
分类号:P315
基金项目:国家自然科学基金(41804107)、深圳市深远海油气勘探技术重点实验室项目(ZDSYS20190902093007855)和深圳市科技计划(KQTD20170810111725321)共同资助
Relocation of Main Shock and Aftershocks of the MS7.0 Sichuan Jiuzhaigou Earthquake
Xu Xu1, Xu Jincheng2, Zhang Wei2
1.School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China;2.Department of Earth and Space Sciences, Southern University of Science and Technology(Shenzhen Key Laboratory of Deep Offshore Oil and Gas Exploration Technology), Shenzhen 518055, Guangdong, China
Abstract:
Relocation of the Jiuzhaigou earthquake and its aftershocks by using the source-specific station terms (SSTT) method has been performed in this paper. The results show that the Jiuzhaigou main shock is located at depth of about 19km,and the aftershocks are mainly distributed at the depth range of 5~15km. Compared with the results of single-event location method,the distribution of the aftershocks in our study is more consistent with the linear character of faults strike,and more likely to have plane character. Compared with the results of double-difference method,the spatial coverage of events could be wider. The results of relocation indicate that the faulting plate is from the northwest extension of the Huya fault. Based on the distribution of aftershocks and correction terms in the study area,we believed that the seismogenic fault could be divided into two sections,north and south. The length of aftershock area is approximately 40km,the width of northwest section is approximately 10km,and the width of southeast section is approximately 6.5km.
Key words:  SSST method  Jiuzhaigou earthquake  Aftershock sequence  Seismogenic fault