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| Study on displacement field generated by aftershocks in Landers earthquake fault zone and its adjacent areas | |
| 作者姓名： | 万永革 沈正康 兰从欣 |
| 作者单位： | Institute of Geology，China Earthquake Adiminstration，Beijing 100029，China，College of Disaster Prevention Techniques，Beijing 101601，China，Institute of Geology，China Earthquake Adiminstration，Beijing 100029，China，Department of Earth and Space Sciences，University of California，Los Angeles CA 90095-1567，USA，Earthquake Administration of Beijing，Beijing 100080，China |
| 基金项目： | National Natural Science Foundation of China (40374012) and National Basic Key Project (2002CCA04500). |
| 摘 要： | Introduction The displacement field produced by earthquake can be measured on the Earth surface. The displacement field variation with time can be used to study lots of geodynamics parameters such as the Earth′s viscosity structure (Nur and Mavko, 1974; Sun et al, 1994; Deng et al, 1998), after-slip distribution (Shen et al, 1994; Reilinger et al, 2000), etc. Furthermore, earthquake also pro-duces lots of aftershocks, which have nearly the same focal mechanism as the main shock (e.g. Hard… |
| 收稿时间： | 20 October 2003 |
| 修稿时间： | 17 September 2004 |
Study on displacement field generated by aftershocks in Landers earthquake fault zone and its adjacent areas |
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| WAN Yong-ge,SHEN Zheng-kang,LAN Cong-xin.Study on displacement field generated by aftershocks in Landers earthquake fault zone and its adjacent areas[J].Acta Seismologica Sinica(English Edition),2005,18(2):147-153. | |
| Authors: | WAN Yong-ge SHEN Zheng-kang LAN Cong-xin |
| Institution: | 1. Institute of Geology, China Earthquake Adiminstration, Beijing 100029, China;College of Disaster Prevention Techniques, Beijing 101601, China 2. Institute of Geology, China Earthquake Adiminstration, Beijing 100029, China;Department of Earth and Space Sciences, University of California, Los Angeles CA 90095-1567, USA 3. Earthquake Administration of Beijing, Beijing 100080, China |
| Abstract: | The displacement field generated by aftershocks in Landers earthquake fault zone and its adjacent areas is calcu- lated in this study. The result is compared with the displacement field of the main shock calculated by co-seismic slip model of Wald and Heaton (1994). The result shows that the direction of displacement generated by after- shocks in Landers seismic fault plane and its adjacent areas is consistent with that generated by main shock. The rupture of aftershock is generally inherited from main shock. The displacement generated by aftershocks is up to an order of centimeter and can be measured by GPS sites nearby. So when we use geodetic data measured after earthquake to study the geophysical problems such as crustal viscosity structure, afterslip distribution, etc., only the displacement field generated by aftershocks considered, can uncertainty be reduced to minimum and realistic result be obtained. |
| Keywords: | aftershocks displacement field focal mechanism Landers earthquakes |
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