Source process of the 2007 Niigata-ken Chuetsu-oki earthquake derived from near-fault strong motion data
Source process of the 2007 Niigata-ken Chuetsu-oki earthquake derived from near-fault strong motion data
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根据近断层强震数据推导出2007年新泻县中越冲地震的震源过程
DOI：
10.1186/bf03353149
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
T. Kunugi
中科院分区：
文献类型：
--
作者：
S. Aoi;H. Sekiguchi;N. Morikawa;T. Kunugi
2007年的新泻县中越冲地震在柏崎和嘉利羽产生了强烈的地面运动，那里是世界上最大的核电站正在运行。由于余震分布的复杂性，北西倾断层和/或东南倾断层的激活被提出。为了探讨断层几何形状和震源过程的地震，我们进行了多时间窗口的线性波形反演的两个断层面的近断层强震数据。建立了一个长30公里、宽24公里的断层面模型，覆盖了主震后24小时内的余震分布区。这两个倒置的滑动模型提供了一个小的粗糙面附近的破裂起始点，和一个大的粗糙面约10公里的西南部的破裂开始，这是位于该地区的相对稀疏的余震分布的矩震级为6.7。小微凸体和大微凸体都位于两个共轭断层面模型的交点附近，并且两个模型的微凸体具有相似的辐射方向图。因此，两个模型的观测波形和合成波形之间的残差差异不显著，这表明很难断定哪个断层是破裂。
The 2007 Niigata-ken Chuetsu-oki earthquake generated strong ground motions in Kashiwazaki and Kariwa, where the world largest nuclear power plant was in operation. Due to the complexity of the aftershock distribution, activation of the northwest-dipping fault and/or the southeast-dipping fault is proposed. To explore the fault geometry and source process of the earthquake, we performed multi-time window linear waveform inversions for both the fault planes from near-fault strong motion data. A fault plane model of 30 km in length by 24 km in width was set to cover the region of aftershock distribution within 24 h of the mainshock. Both inverted slip models provided moment magnitudes of 6.7 with a small asperity near the rupture starting point, and a large asperity approximately 10 km southwest of the rupture initiation, which is located in the region of relatively sparse aftershock distribution. Both the small and large asperities are located near the intersection between the two conjugate fault plane models, and the asperities of both models have similar radiation patterns. Therefore, the difference of the residuals between the observed and synthetic waveforms for both models was not significant, indicating that it is difficult to conclude which fault is the rupture.