| Crustal structure and accurate hypocenter determination along the Longmenshan fault zone |
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| 作者姓名： | 赵珠 范军 郑斯华 长谷川昭 内茂木 |
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| 作者单位： | ZHU ZHAO 1) JUN FAN 1) SI HUA ZHENG 2) AKIRA HASEGAWA 3)SHIGEKI HORIUCHI 3)1) Seismological Bureau of Sichuan Province，Chengdu 610041，China 2) Center for Analysis and Prediction，State Seismological Bureau，Beijing 100036，China |
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| 摘 要： | Ｃｒｕｓｔａｌｓｔｒｕｃｔｕｒｅａｎｄａｃｃｕｒａｔｅｈｙｐｏｃｅｎｔｅｒｄｅ┐ｔｅｒｍｉｎａｔｉｏｎａｌｏｎｇｔｈｅＬｏｎｇｍｅｎｓｈａｎｆａｕｌｔｚｏｎｅＺＨＵＺＨＡＯ１）（赵珠）ＪＵＮＦＡＮ１）（范军）ＳＩ－ＨＵＡＺＨＥＮＧ２）（郑斯华）ＡＫ...
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| 收稿时间： | 2 August 1996 |
| 修稿时间： | 30 April 1997 |
Crustal structure and accurate hypocenter determination along the Longmenshan fault zone |
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| Zhu Zhao, Jun Fan, Si-Hua Zheng, Akira Hasegawa and Shigeki Horiuchi.Crustal structure and accurate hypocenter determination along the Longmenshan fault zone[J].Acta Seismologica Sinica(English Edition),1997,10(6):761-768. |
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| Authors: | Zhu Zhao Jun Fan Si-Hua Zheng Akira Hasegawa and Shigeki Horiuchi |
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| Institution: | (1) Seismological Bureau of Sichuan Province, 610041 Cheng du, China;(2) Center for Analysis and Prediction, State Seismological Bureau, 100036 Beijing, China;(3) Observation Center for Prediction of Earthquakes and Volcanic Eruptions, Faculty of Science, Tohoku University, 980-77 Sendai, Japan |
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| Abstract: | A P and S wave velocity model is obtained for the crust in the region along the Longmenshan fault zone, Sichuan Province, China, by using data from a refraction profiling survey carried out in this region and those from local earthquakes. 202 local earthquakes along the fault zone are based on this velocity model, location errors being estimated to be about 1.5 km. The present relocations fairly improved the accuracy of hypocenter locations for earthquakes in this area, which is recognized from small scatter of data in the arrival time distance diagram compared with that for the original locations in the Earthquake Catalogue of Sichuan Seismic Network. The obtained hypocenter distribution shows that shallow earthquakes, confined to the upper crust in the depth range from 3 km to 22 km, are actively occurring along the main fault of the Longmenshan fault zone. The velocity model and the location method are presently used quite effective for precisely locating local earthquakes such as those in Sichuan Province. Installation of these with the real time processing system developed by Tohoku University in the Sichuan Telemetered Seismic Network would help to improve the location accuracy of events beneath the network. |
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| Keywords: | Longmenshan fault zone P wave S wave hypocenter determination velocity model arrive time curve |
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