| 利用阿拉斯加台阵资料分析2008年汶川大地震的破裂过程 |
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| 引用本文： | 杜海林,许力生,陈运泰.利用阿拉斯加台阵资料分析2008年汶川大地震的破裂过程[J].地球物理学报,2009,52(2):372-378. |
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| 作者姓名： | 杜海林 许力生 陈运泰 |
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| 作者单位： | 中国地震局地球物理研究所，北京 100081 |
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| 基金项目： | 中国地震局地球物理研究所基本科研业务专项基金，国家基础研究发展计划，国家自然科学基金，科技部科技支撑项目 |
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| 摘 要： | 2008年5月12日，四川省汶川县发生MS8.0地震.我们利用美国阿拉斯加区域台网的部分宽频带地震台构成广义台阵， 应用非平面波台阵技术——迁移叠加方法，获得了这次地震的高频（>0.1 Hz）能量辐射源随时间和空间变化的图像.图像表明，这次地震破裂从震中开始向北东方向扩展约300 km，震源过程至少长达90 s，平均破裂速度为3.4 km/s；整个过程可分为两大阶段，前段持续时间50 s，破裂长度约110 km，破裂传播的平均速度为2.2 km/s，后段持续时间约40 s，长度约190 km，平均破裂速度为4.8 km/s.这意味着地震过程的后期似乎发生了超S波破裂，而且后段很可能为前段动态触发所致.
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| 关 键 词： | 汶川大地震 广义台阵技术 持续时间 破裂长度 破裂速度 |
| 收稿时间： | 2009-1-4 |
| 修稿时间： | 2009-1-22 |
Rupture process of the 2008 great Wenchuan earthquake from the analysis of the Alaska-array data |
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| DU Hai-Lin,XU Li-Sheng,CHEN Yun-Tai.Rupture process of the 2008 great Wenchuan earthquake from the analysis of the Alaska-array data[J].Chinese Journal of Geophysics,2009,52(2):372-378. |
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| Authors: | DU Hai-Lin XU Li-Sheng CHEN Yun-Tai |
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| Institution: | Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | On 12th of May, 2008，an MS8.0 earthquake occurred in Wenchuan county, Sichuan province of China. We configured a generalized array with the broadband seismic stations of the Alaska Regional Network，USA, and imaged the temporal and spatial variation of high-frequency (>0.1 Hz) energy radiation sources by means of one of the non-plane wave array techniques—migration stacking technique. The image shows that the earthquake faulting initiated at the instrumental epicenter and extended north-eastwards about 300 km, the whole rupture process lasted for at least 90s, and the average rupture speed was about 3.4 km/s. The whole process may be divided into two major periods. The first period is 50 s and in this period the rupture propagated about 110 km, with an average rupture speed of 2.2 km/s; the other period is 40 s and in this period the rupture propagated about 190 km, with an average speed of 4.8 km/s. It seems that supershear rupture appeared in the later process of the earthquake, and the second segment might be dynamically trigged by the first one. |
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| Keywords: | Great Wenchuan earthquake Generalized array technique Rupture duration Rupture extent Rupture speed |
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