| 海原断裂带库仑应力积累 |
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| 引用本文： | 崔笃信,胡亚轩,王文萍,朱桂芝.海原断裂带库仑应力积累[J].地球科学,2009(4). |
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| 作者姓名： | 崔笃信 胡亚轩 王文萍 朱桂芝 |
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| 作者单位： | 中国地震局第二监测中心; |
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| 基金项目： | 国家自然科学基金项目(No.40674057);;中国地震科学基金(No.A07132) |
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| 摘 要： | 用中国地壳运动观测网络区域站在海原断裂带附近的所有观测数据及跨断裂GPS剖面观测数据作为约束,用Smith3D体力模型反演了海原断裂带断层滑动速率和断层闭锁深度,计算了库仑应力积累率和地震矩积累率.采用遗传算法拟合GPS水平运动速度场,拟合的最后残差均方根为1.2mm/a.反演结果为:第一段毛毛山断裂左旋走滑运动速率为3.6mm/a,闭锁深度为22km;第二段老虎山断裂左旋走滑速率为10.5mm/a,闭锁深度为11.4km;第三、四、五段(海原断裂带西段、中段和东段)滑动速率依次为3.5mm/a、5.8mm/a、5.7mm/a,闭锁深度依次为8.5km、3.6km、4.3km.海原断裂带库仑应力积累率为0.48～1.59MPa/100a,毛毛山断裂地震矩积累率较大,但库仑应力积累率较小;老虎山断裂库仑应力积累率和地震矩积累率均比较大;海原断裂带(狭义)中西段库仑应力积累率最大.
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| 关 键 词： | 海原断裂带 3D体力模型 滑动速率 闭锁深度 库仑应力积累率 地震距积累率 地震 |
Coulomb Stress Accumulation along Haiyuan Fault Zone |
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| CUI Du-xin,HU Ya-xuan,WANG Wen-ping,ZHU Gui-zhi No. Monitoring Center of China Earthquake Administration,Xi'an ,China.Coulomb Stress Accumulation along Haiyuan Fault Zone[J].Earth Science-Journal of China University of Geosciences,2009(4). |
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| Authors: | CUI Du-xin HU Ya-xuan WANG Wen-ping ZHU Gui-zhi No Monitoring Center of China Earthquake Administration Xi'an China |
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| Institution: | CUI Du-xin,HU Ya-xuan,WANG Wen-ping,ZHU Gui-zhi No.2 Monitoring Center of China Earthquake Administration,Xi'an 710054,China |
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| Abstract: | We caculate Coulomb stress accumulation rate and moment accumulation rate through inversing Haiyuan fault slipping rates and locking depths by using a Fourier solution of 3D body force model with constrains of CMONOC and GPS profiles data.Genetic algorithm has been applied to simulate the GPS velocity field.The last fitting rms residual is 1.2 mm/a.The result reveals that the slip rate of left lateral of Maomao Shan fault is 3.6 mm/a,and 22.2 km for the locking depth.For Laohushan,its slip rate is 10.5 mm/a... |
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| Keywords: | Haiyuan fault zone 3D body force model slip rate locking depth Coulomb stress accumulation rate moment accumulation rate seismology |
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