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| Variational characteristics of shear-wave splitting on the 2001 Shidian earthquakes in Yunnan, China | |
| 作者姓名： | 高原 梁维 丁香 薛艳 蔡明军 刘希强 苏有锦 彭立国 |
| 作者单位： | Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Graduate School，Chinese Academy of Sciences，Beijing 100039，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Institute of Earthquake Science，China Earthquake Administration，Beijing 100036，China，Earthquake Administration of Yunnan Province，Kunming 650041，China，Earthquake Administration of Shandong Province，Jinan 250014，China，Earthquake Administration of Yunnan Province，Kunming 650041，China，Center for Comprehensive Surveying，China Earthquake Administration，Beijing 100039，China |
| 基金项目： | National Natural Science Foundation of China (40274011，40074020)，MOST (2001BA601B02) and Joint Seis-mological Science Foundation of China (102068). |
| 摘 要： | Introduction In the crust there exist widely vertical nearly-parallel fluid-saturated microcracks, which are nearly parallel. Shear-wave splitting can be observed when shear-wave travels through this kind of microcrack structure. Shear-wave splitting could be adopted to monitor the earthquake activity since its pattern is very sensitive to variation of crustal stress (GAO, et al, 1995, 1996), however, it needs lots of reliable 3-component waveform data. Previous studies mainly used some temp… |
| 收稿时间： | 20 August 2003 |
| 修稿时间： | 2 February 2004 |
Variational characteristics of shear-wave splitting on the 2001 Shidian earthquakes in Yunnan, China |
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| Gao Yuan , Liang Wei , Ding Xiang , Xue Yan , Cai Ming-jun , Liu Xi-qiang , Su You-jin and Peng Li-guo.Variational characteristics of shear-wave splitting on the 2001 Shidian earthquakes in Yunnan, China[J].Acta Seismologica Sinica(English Edition),2004,17(6):635-641. | |
| Authors: | Gao Yuan Liang Wei Ding Xiang Xue Yan Cai Ming-jun Liu Xi-qiang Su You-jin and Peng Li-guo |
| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China 2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China 3. Earthquake Administration of Yunnan Province, Kunming 650041, China 4. Earthquake Administration of Shandong Province, Ji'nan 250014, China 5. Center for Comprehensive Surveying, China Earthquake Administration, Beijing 100039, China |
| Abstract: | In 2001 three earthquakes occurred in Shidian in Yunnan Province, which were the MS=5.2 on April 10, the MS=5.9 on April 12 and the MS=5.3 on June 8. Based on the data from the station Baoshan of Yunnan Telemetry Digital Seismograph Network, the variational characteristics of shear-wave splitting on these series of strong earthquakes has been studied by using the systematic analysis method (SAM) of shear-wave splitting. The result shows the time delays of shear-wave splitting basically increase with earthquake activity intensifying. However the time delays abruptly decrease immediately before strong aftershocks. It accords with the stress relaxation before earthquakes, which was found recently in study on shear-wave splitting. The result suggests it is significant for reducing the harm degree of earthquakes to develop the stress-forecasting on earthquake in strong active tectonic zones and economic developed regions or big cities under the danger of strong earthquakes. |
| Keywords: | shear-wave splitting temporal change earthquake stress-forecasting Shidian earthquakes SAM analysis |
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