Spatiotemporal Variations of Seismic Quiescence prior to the 2011 M 9.0 Tohoku Earthquake Revealed by an Improved Region-Time-Length Algorithm
Spatiotemporal Variations of Seismic Quiescence prior to the 2011 M 9.0 Tohoku Earthquake Revealed by an Improved Region-Time-Length Algorithm
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DOI：
10.1785/0120110343
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发表时间：
2012-08-01
影响因子：
3
通讯作者：
Ding, Xia
中科院分区：
文献类型：
--
作者：
Huang, Qinghua;Ding, Xia
区域时间长度（RTL）算法考虑了地震的震中、时间和震级，是检测地震静止的有效技术。为了减少RTL算法中模型参数选择可能产生的歧义，我们提出了一种搜索最佳模型参数的改进技术。作为案例研究，我们通过将改进的 RTL 算法应用于日本气象厅 (JMA) 的分簇完整地震目录，研究了东北 9.0 级地震之前地震静止的时空变化。震中RTL参数的时间变化表明2006年至2008年发生了地震静止。空间分布显示震中附近异常静止出现的时间窗口一致。模型参数效应的密切研究和基于随机地震目录的随机检验支持了地震静止异常的重要性。
The region-time-length (RTL) algorithm, which takes into account the epicenter, time, and magnitude of earthquakes, is an effective technique in detecting seismic quiescence. In order to reduce the possible ambiguity due to the selection of model parameters in the RTL algorithm, we propose an improved technique of searching for the optimal model parameters. As a case study, we investigated the spatiotemporal variations of seismic quiescence prior to the M 9.0 Tohoku earthquake by applying the improved RTL algorithm to the declustered and complete earthquake catalog of the Japan Meteorological Agency (JMA). The temporal variation of the RTL parameter at the epicenter indicated that a seismic quiescence occurred between 2006 and 2008. The spatial distribution showed the consistent time window of the appearance of anomalous quiescence near the epicenter. The significance of the seismic quiescence anomaly was supported by the close investigations of model parameter effects and the stochastic test based on randomized earthquake catalogs.