| 2013年四川芦山MS7.0地震 强地面运动模拟 |
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| 引用本文： | 药晓东,章文波.2013年四川芦山MS7.0地震 强地面运动模拟[J].地震学报,2015,37(4):599-616. |
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| 作者姓名： | 药晓东 章文波 |
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| 作者单位： | 中国北京 100049 中国科学院大学地球科学学院 |
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| 基金项目： | 国家自然科学基金项目，中国科学院、国家外国专家局创新团队国际合作伙伴计划(KZZD-EW-TZ-19)联合资助． |
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| 摘 要： | 运用经验格林函数法模拟2013年4月20日芦山MS7.0地震的近场强地面运动. 在拟合过程中， 首先参考前人远场反演结果给出的滑动量分布特征和主震波形的包络线特征， 确定强震动生成区的大致范围和数量； 然后利用Somerville等提出的地震矩与凹凸体面积的经验关系式确定强震动生成区细小划分的初值， 继而利用遗传优化算法确定以上二者的最优值及其它震源参数. 将数值模拟波形与实际地震观测记录在时间域和频率域分别进行比较， 结果显示， 在所选取的30个观测台站中， 多数台站的数值模拟结果与实际观测结果符合得很好， 特别是大于1 Hz的高频部分. 断层面上有两个强震动生成区， 其位置与前人反演的滑动量集中分布区相一致， 而且强震动生成区规模比Somerville等获得的标度率估计值要小.
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| 关 键 词： | 强地面运动 芦山MS7.0地震 经验格林函数法 震源参数 波形对比 |
| 收稿时间： | 2014-09-13 |
Strong ground motion simulation for the 2013 MS7.0 Lushan,China,earthquake |
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| Yao Xiaodong,Zhang Wenbo.Strong ground motion simulation for the 2013 MS7.0 Lushan,China,earthquake[J].Acta Seismologica Sinica,2015,37(4):599-616. |
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| Authors: | Yao Xiaodong Zhang Wenbo |
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| Affiliation: | College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The near source strong ground motions of the 2013 MS7.0 Lushan, China, earthquake were simulated using empirical Green’s function (EGF) method. At first, we estimated the amount and location of strong motion gene-ration areas (SMGAs) based on the characteristics of both slip distributions from far-field seismic inversion and the envelopes of recorded acceleration from the main shock, and determined the amount of subfaults on SMGAs referring to the scaling law of asperity area versus seismic moment introduced by Somerville et al. Then, we implemented the genetic algorithm searching for the optimized value of above two and other source parameters. Based on the source models, we synthetized the waveforms for the 30 selected stations near the source region. The comparison of the synthetic waveforms with the observed records indicated that they agreed very well with each other, especially for the part of high-frequency larger than 1 Hz. We found that there were two obvious SMGAs on the fault, which take the position that the asperities from far-field seismic inversion take. The combined SMGAs we obtained were smaller than those predicted by extension of the scaling law by Somerville et al. |
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| Keywords: | strong ground motion Lushan MS 7 0 earthquake empirical Green’s function method source parameter waveform comparison |
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