| 从多地震活动参数角度定量分析芦山地震的背景活动性 |
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| 作者姓名： | 王静静 张怀 庞亚瑾 石耀霖 |
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| 作者单位： | 中国科学院大学地球科学学院 中国科学院计算地球动力学重点实验室, 北京 100049 |
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| 基金项目： | 国家重点基础研究发展计划(2014CB845906)和国家自然科学基金(41274103)资助 |
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| 摘 要： | 2013年4月20日龙门山断裂带南段发生Ms7.0级芦山地震,通过计算多个地震活动参数,定量分析芦山地震发生的背景地震活动性及与汶川地震的关联性.结果表明:1)历史记载龙门山断裂南段仅有3次6.0级以上强震,存在地震空区的历史地震背景;2)通过a值分析可知,芦山地震发生前30年背景地震活动性较高;3)分析汶川地震前后b值的空间分布差异,发现龙门山断裂南段在汶川地震后仅部分区域b值下降,应力增强,芦山地震发生在b值明显下降区.
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| 关 键 词： | 芦山地震 地震活动性 a值" target="_blank">a值')">a值 b值" target="_blank">b值')">b值 |
| 收稿时间： | 2014-04-14 |
| 修稿时间： | 2014-05-04 |
Quantitative analysis of Lushan earthquake background activity with earthquake multi-parameters |
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| Authors: | WANG Jingjing ZHANG Huai PANG Yajin SHI Yaolin |
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| Institution: | Key Laboratory of Computational Geodynamics, College of Earth Science, University of Chinese Academy of Science, Beijing 100049, China |
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| Abstract: | The Ms7.0 Lushan earthquake occurred in the southern part of Longmenshan fault on 20 April 2013. We calculate several kinds of seismic activity parameters to analyze the background activity of Lushan earthquake and relate them with Wenchuan earthquake. The results show that 1) there were only three great earthquakes above M6.0 occurring in the southern part of Longmenshan fault, which indicates existence of earthquake gap in historic earthquake background; 2) based on the values of a, the background earthquake activity was high during the 30 years before Lushan earthquake; and 3) the spatial difference in b-value before and after Wenchuan earthquake shows decrease of b-value and increase of stress only in part of southern Longmenshan fault zone while Lushan earthquake occurred in the region where b-value decreased apparently. |
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| Keywords: | Lushan earthquake earthquake activity a-value" target="_blank">a-value')">a-value b-value" target="_blank">b-value')">b-value |
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