| 2008年汶川MS8.0地震与2017年九寨沟MS7.0地震成因关系探讨 |
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| 引用本文： | 董培育,柳畅,石耀霖.2008年汶川MS8.0地震与2017年九寨沟MS7.0地震成因关系探讨[J].大地测量与地球动力学,2019,39(8):777-782. |
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| 作者姓名： | 董培育 柳畅 石耀霖 |
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| 作者单位： | 中国地震局地震研究所地震大地测量重点实验室,武汉市洪山侧路40号,430071;同济大学海洋地质国家重点实验室,上海市四平路1239号,200092;中国科学院大学,北京市玉泉路19号甲,100049 |
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| 基金项目： | 国家自然科学基金;国家科技基础性工作专项;中央级公益性科研院所基本科研业务费专项 |
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| 摘 要： | 利用2008年汶川地震破裂模型及2017年九寨沟地震接收断层参数和断层面有效摩擦系数等不同模型参数，计算2008年汶川地震造成的库仑应力变化。结果显示，在考虑不同模型参数条件下，2017年九寨沟地震震源处的库仑应力增量（同震及震后）约为3~7 kPa，尚未达到地震触发阈值10 kPa。综合分析认为，2008年汶川地震对2017年九寨沟地震有一定的触发作用，但作用十分有限，九寨沟地震的发生主要受控于区域构造活动及地壳流变结构。分析不同参数对计算结果的影响发现，不同破裂模型的选取对2018年汶川地震计算结果的影响最大，这可能是导致前人研究结论产生差异的原因之一。
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| 关 键 词： | 九寨沟地震 汶川地震 库仑应力变化 地震触发作用 |
Relationship between the 2008 MS8.0 Wenchuan Earthquake and the 2017 MS7.0 Jiuzhaigou Earthquake |
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| DONG Peiyu,LIU Chang,SHI Yaolin.Relationship between the 2008 MS8.0 Wenchuan Earthquake and the 2017 MS7.0 Jiuzhaigou Earthquake[J].Journal of Geodesy and Geodynamics,2019,39(8):777-782. |
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| Authors: | DONG Peiyu LIU Chang SHI Yaolin |
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| Abstract: | We calculate the Coulomb failure stress change caused by the 2008 Wenchuan earthquake by choosing model parameters, such as the 2008 Wenchuan earthquake rupture models, the fault parameters of 2017 Jiuzhaigou earthquake, and the effective friction coefficient. Our results show that the sum of co-seismic and post-seismic Coulomb stress change until 2017 is about 3~7 kPa at the epicenter of the Jiuzhaigou earthquake, which is less than the triggering threshold (10 kPa). The 2008 Wenchuan earthquake might have promoted the 2017 Jiuzhaigou earthquake to some degree. However, the triggering is not the main cause of the occurrence of the 2017 Jiuzhaigou earthquake. By analyzing the stress results from the models with various model parameters, we find that the rupture model of 2008 Wenchuan earthquake has the greatest impact on the results. Using a different rupture model of the 2008 Wenchuan earthquake might be the main reason for the different results from previous studies. |
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| Keywords: | Jiuzhaigou earthquake Wenchuan earthquake Coulomb stress change earthquake triggering |
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