| 1997年以来巴颜喀拉块体周缘强震之间的黏弹性触发研究 |
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| 引用本文： | 程佳,刘杰,甘卫军,余怀忠.1997年以来巴颜喀拉块体周缘强震之间的黏弹性触发研究[J].地球物理学报,2011,54(8):1997-2010. |
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| 作者姓名： | 程佳 刘杰 甘卫军 余怀忠 |
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| 作者单位： | 1. 中国地震台网中心,北京 100045;
2. 中国地震局地质研究所地震动力学国家重点实验室,北京 100029 |
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| 基金项目： | 国家重点基础研究规划项目(2008CB425704)、中国地震局地质研究所地震动力学国家重点实验室开放基金(LED2009B02)和地震行业科研专项"中国综合地球物理场观测—青藏高原东缘地区" 资助. |
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| 摘 要： | 本文利用考虑黏弹性地壳结构和精确震源参数的震后形变模型,计算了玛尼、昆仑山口西、汶川地震所形成的同震和震后形变场的变化过程与特征,结果显示玛尼地震的震后形变场有利于昆仑山口西地震的能量积累,玛尼地震与昆仑山口西地震的震后形变场对汶川地震的作用不明显,而这三次地震总的震后形变场在玉树断裂带附近形成了一个明显带有左旋性质的...
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| 关 键 词： | 玛尼地震 昆仑山口西地震 汶川地震:玉树地震 黏弹性形变 应力触发 |
| 收稿时间： | 2010-10-22 |
Coulomb stress interaction among strong earthquakes around the Bayan Har block since the Manyi earthquake in 1997 |
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| CHENG Jia,LIU Jie,GAN Wei-Jun,YU Huai-Zhong.Coulomb stress interaction among strong earthquakes around the Bayan Har block since the Manyi earthquake in 1997[J].Chinese Journal of Geophysics,2011,54(8):1997-2010. |
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| Authors: | CHENG Jia LIU Jie GAN Wei-Jun YU Huai-Zhong |
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| Institution: | 1. China Earthquake Network Center, Beijing 100045, China;
2. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China |
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| Abstract: | Using the crustal structure model and precise earthquake source model, we have calculated the coseismic and viscoelastic postseismic deformation field of the Manyi, Kokoxili, and Wenchuan earthquake. The results show as follows: the source fault of the Kokoxili earthquake has got energy accumulated in the postseismic deformation field of the Manyi earthquake, while the source of the Wenchuan earthquake has not been apparently affected by the Manyi and Kokoxili earthquakes. The postseismic deformation field of all the 3 previous earthquakes has got significant dextral deformation trend across the Yushu fault, which makes it more dangerous. After that, the Coulomb stress changes have been obtained after the projection of the changed stress field. We have found that the Coulomb stress of the Kokoxili earthquake, which was produced by the Manyi earthquake, changed from negative to positive. The Coulomb stress near the source of the Wenchuan earthquake changed negligibly after the Manyi and Kokoxili earthquake. But the Coulomb stress of the initial rupture point of the Yushu earthquake, generated by all the 3 previous earthquakes, has increased about 0.012 MPa, larger than the threshold for earthquake triggering. Finally, we have got the yearly accumulation value via the relationship between the slip rate and the stress accumulation, and calculated the ratio of the influence value and yearly accumulation value. It is shown that the influence degree among the studied strong earthquakes is not large enough, even the largest one is only about 1 year's acceleration on the Yushu fault by the Kokoxili earthquake. To sum up, the influence from distant strong earthquakes is still not obvious even the viscoelastic stress changes have been taken into account. The energy accumulation is the decisive factor of the strong earthquakes successively occurred in a short period on the boundary fault of the same block. |
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| Keywords: | Manyi earthquake Kokoxili earthquake Wenchuan earthquake Yushu earthquake Viscoelastic deformation Coulomb stress triggering |
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