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Empirical subspace detection applied to triggered seismicity by the July 25, 2011, Mw 5.0 earthquake in the Sea of Marmara, Turkey
Computers & Geosciences ( IF 4.4 ) Pub Date : 2021-04-07 , DOI: 10.1016/j.cageo.2021.104738
Camilo De La Hoz , Jean Baptiste Tary , Anthony Lomax

The northern branch of the North Anatolian Fault in the Sea of Marmara (SoM) shows a complex seismological behavior including shallow, fluid-related seismicity, deep seismicity, and locked and creeping segments. On July 25, 2011, a Mw 5 earthquakes occurred at a depth of ~11.5 km in the western SoM and immediately followed by hundreds of triggered micro-earthquakes mostly outside the rupture area of the mainshock. We here present the application of empirical subspace detector to improve the detection of small events belonging to this sequence and compare these results with the match-filter technique. Using first the station with the highest signal-to-noise ratio, three main clusters are obtained with one cluster of 27 events and two clusters of 3 events leading to 1056 child-events detected. The child-events were manually selected and picked, and 457 child-events were located with NonLinLoc. The empirical subspace detector leads then to ~5.5 times more events located compared with the number of parent events, and ~1.6 times more events located than the match-filter technique. The subspace detector technique is sensitive mostly to the frequency band for filtering and the clustering parameters. Small changes in these parameters can lead to significantly different detection results. Extending the subspace detector to include network subspace statistics instead of a single station allows the inclusion of different stations and components, and should decrease the important false detection rate observed. The application of the empirical subspace detector to this sequence confirms the potential of this technique to improve event detection and better define spatio-temporal seismicity patterns.



中文翻译:

实证子空间探测应用触发的地震活动在2011年7月25日,男W¯¯ 5.0级地震在马尔马拉海,土耳其的海

马尔马拉海(AnaM)的北安那托利亚断层的北分支表现出复杂的地震行为,包括浅,与流体有关的地震活动,深地震活动以及锁定和蠕变段。2011年7月25日,A M w ^ 5级地震发生的深度在西部SoM的11.5公里处,随后立即发生了数百次触发的微地震,这些地震大多发生在主震破裂区域之外。我们在此介绍经验子空间检测器的应用,以改进对属于该序列的小事件的检测,并将这些结果与匹配过滤器技术进行比较。首先使用信噪比最高的电台,获得三个主要集群,其中一个集群包含27个事件,两个集群包含3个事件,导致检测到1056个子事件。手动选择并选择了子事件,并且使用NonLinLoc找到了457个子事件。经验子空间检测器然后导致与父事件相比,定位的事件多出5.5倍,并且 事件定位是匹配过滤器技术的1.6倍。子空间检测器技术主要对要过滤的频带和聚类参数敏感。这些参数的微小变化会导致检测结果明显不同。将子空间检测器扩展为包括网络子空间统计信息而不是单个站点,可以包含不同的站点和组件,并且应降低观察到的重要错误检测率。经验子空间检测器在该序列上的应用证实了该技术在改进事件检测和更好地定义时空地震活动性模式方面的潜力。

更新日期:2021-04-14
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