| Study on a gravity precursor mode of the Ms=7.0 Lijiang earthquake |
| |
| 作者姓名： | 申重阳 李辉 傅广裕 |
| |
| 作者单位： | InstituteofSeismology,ChinaSeismologicalBureau,Wuhan430071,China |
| |
| 基金项目： | 地震科学联合基金，国家重点基础研究发展计划(973计划) |
| |
| 摘 要： | To study the seismogeny process or the precursory behavior of the 1976Ms=7.0 Lijiang earthquake,we analyze the repeat gravity data with high precision from the Westem Yunnan Earthquake Prediction Experiment Area(WYEPEA)and the relted results of geology and geophysics survey in this paper.Considering the gross errors caused by observation data and model difference,we have firstly inverted the slip distribution of the main active faults with time based on the robust Bayesian least squares estimation and multi-fault dislocation model.The re-sults show that the slip changes of the faults with time from 1990to 1997obviously reflect the preparation process of the Lijiang earthquake.The images of main precursor mode have the characteristic of main shock-after shock type,which is agreement to the model of coupling movement tetween crust density and crust deformation(DD mode of coupling movement).
|
| 关 键 词： | 丽江地震 地震前兆 重力异常 云南 地球物理测量 地震观测 断层 地壳变形 |
| 收稿时间： | 27 May 2002 |
| 修稿时间： | 18 October 2002 |
Study on a gravity precursor mode of the M s=7.0 Lijiang earthquake |
| |
| Shen Chong-yang , Li Hui and Fu Guang-yu.Study on a gravity precursor mode of the Ms=7.0 Lijiang earthquake[J].Acta Seismologica Sinica(English Edition),2003,16(2):175-184. |
| |
| Authors: | Shen Chong-yang Li Hui and Fu Guang-yu |
| |
| Institution: | (1) Institute of Seismology, China Seismological Bureau, 430071 Wuhan, China |
| |
| Abstract: | To study the seismogeny process or the precursory behavior of the 1976 M
S=7.0 Lijiang earthquake, we analyze the repeat gravity data with high precision from the Western Yunnan Earthquake Prediction
Experiment Area (WYEPEA) and the related results of geology and geophysics survey in this paper. Considering the gross errors
caused by observation data and model difference, we have firstly inverted the slip distribution of the main active faults
with time based on the robust Bayesian least squares estimation and multi-fault dislocation model. The results show that the
slip changes of the faults with time from 1990 to 1997 obviously reflect the preparation process of the Lijiang earthquake.
The images of main precursor mode have the characteristic of main shock-after shock type, which is agreement to the model
of coupling movement between crust density and crust deformation (DD mode of coupling movement).
Foundation item: Joint Seismological Science Foundation of China (101005) and the State Key Basic Research Project (G1998040703). |
| |
| Keywords: | Lijiang earthquake repeat gravity observation precursor mode time changes of faults slip |
| 本文献已被 维普 万方数据 SpringerLink 等数据库收录！ |
