| 汶川地震序列中较大深度余震的一种可能的直接观测证据 |
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| 引用本文： | 刘春,吴忠良,蒋长胜.汶川地震序列中较大深度余震的一种可能的直接观测证据[J].中国地震,2009,25(2). |
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| 作者姓名： | 刘春 吴忠良 蒋长胜 |
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| 作者单位： | 1. 陕西省地震局,西安市边家村水文巷4号,710068
2. 中国地震局地球物理研究所,北京,100081 |
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| 摘 要： | 汶川地震序列中为数很少的深度大于30km的余震是否存在,对解释汶川地震的成因机制具有重要意义.本文分析了汶川地震序列中26个"恰好"发生在观测台站下方的小地震--"台下地震",利用这种地震与台站之间的特殊组合来确定这些地震的震源深度,以期为地震精确定位提供"GT事件".在这26个地震中,有两例的震源深度约36km,尽管仍与所采用的地壳结构模型有关,却也提供了深度大于30km的余震存在的直接证据.
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| 关 键 词： | 地震定位 汶川地震 余震序列 GT事件 |
Events with Depths Larger than 30kin in the 2008 Wenchuan Aftershock Sequence: A Possible Direct Evidence |
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| Liu Chun,Wu Zhongliang,Jiang Changsheng.Events with Depths Larger than 30kin in the 2008 Wenchuan Aftershock Sequence: A Possible Direct Evidence[J].Earthquake Research in China,2009,25(2). |
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| Authors: | Liu Chun Wu Zhongliang Jiang Changsheng |
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| Abstract: | Whether there exist events with depths larger than 30km in the aftershock sequence is a critical problem in the seismogenetic model of the 2008 Wenchuan earthquake. In this work, we considered 26 aftershocks "just underneath" seismic stations. Making use of such special station-event configuration to determine the depths of these micro-earthquakes provided accurate relocation of aftershocks with a reference set of "ground truth (GT) events . In these aftershocks, two events have the depth about 36km. Although still being structure-model-dependent, this observation provides a direct evidence for the existence of the events deeper than 30km. |
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| Keywords: | Location of earthquakes Wenchuan earthquake Aftershock sequence Ground truth events |
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