| 2010年4月14日玉树Ms7.1地震对余震的触发研究 |
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| 引用本文： | 宋金,蒋海昆.2010年4月14日玉树Ms7.1地震对余震的触发研究[J].中国地震研究,2012,26(3):348-354. |
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| 作者姓名： | 宋金 蒋海昆 |
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| 作者单位： | 中国地震台网中心，北京西城区三里河南横街5号 100045;中国地震台网中心，北京西城区三里河南横街5号 100045 |
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| 基金项目： | This project was sponsored by the National Key Technology R＆D Program，China (2008BAC38B03 － 01)． |
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| 摘 要： | This paper calculates the static stress changes generated by the Yushu M_S 7. 1 earthquake in Qinghai Province. On the basis of regional stress,we take account of the static stress change triggered by the Yushu M_S 7. 1 earthquake to find the optimally oriented fault planes,then calculate the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes ( M_L ≥3. 0 ) distribution,but the value is lower than 0. 01MPa. In addition,this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison,we find that the image of Coulomb stress changes obtained using the "optimally oriented fault"approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes.
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| 关 键 词： | M_S 7. 1 Yushu earthquake Coulomb stress changes Aftershock distribution Regional stress |
The Effect of Static Stress Triggering of the MS7.1 Yushu Earthquake |
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| Song Jin and Jiang Haikun.The Effect of Static Stress Triggering of the MS7.1 Yushu Earthquake[J].Earthquake Research in China,2012,26(3):348-354. |
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| Authors: | Song Jin and Jiang Haikun |
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| Institution: | China Earthquake Networks Center, Beijing 100045, China;China Earthquake Networks Center, Beijing 100045, China |
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| Abstract: | This paper calculates the static stress changes generated by the Yushu M_S 7. 1 earthquake in Qinghai Province. On the basis of regional stress,we take account of the static stress change triggered by the Yushu M_S 7. 1 earthquake to find the optimally oriented fault planes,then calculate the Coulomb stress change on the optimally oriented fault plane. The results indicate that most of the aftershocks are triggered by the mainshock. The image of Coulomb stress changes is also in accord with regional earthquakes ( M_L ≥3. 0 ) distribution,but the value is lower than 0. 01MPa. In addition,this paper calculates the Coulomb stress changes in the case that the aftershock fault plane is the same as the main shock. Through comparison,we find that the image of Coulomb stress changes obtained using the "optimally oriented fault"approach is more consistent with the distribution of Yushu aftershocks and regional earthquakes. |
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| Keywords: | MS7 1 Yushu earthquake Coulomb stress changes Aftershock distribution Regional stress |
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