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2012 Seismicity Quiescence in Taiwan a Result of Site-Effect Artifacts

机译：2012年台湾地震效应的现场效应结果

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A significant seismic quiescence in Taiwan was reported by Wu and Chiao (2006) before the occurrence of the 1999 M-w 7.6 Chi-Chi earthquake. A similar kind of activity was also observed in the 2012 earthquake catalog reported by Central Weather Bureau (CWB). Seven months in the 2012 catalog seem to have lower monthly seismicity rates than the one standard deviation below the mean (673 +/- 82) for earthquakes with M-L >= 2.0. Here, we checked the seismic network in Taiwan and found that some new seismic stations, including the Broadband Array in Taiwan for Seismology (BATS), were incorporated within the Taiwan Central Weather Bureau Seismic Network (CWBSN) since 2012. Most of these BATS stations are located on hard-rock sites, which may affect magnitude estimation because of their site characteristics. To account for the impact of site effect, earthquake catalog data during the period of 1994 to 2014 was collected and station correction was calculated for each station. A strong correlation is found between station corrections determined in this study and geological settings of the region. Stations located on soil sites have high amplifications with negative station corrections. On the other hand, stations located on hard-rock sites have low amplifications with positive station corrections. After applying station correction, the mean seismicity rate is found to be 716 events per month with a standard deviation of 76 events for earthquakes with M-L >= 2.0. We conclude that the reason behind the apparent low seismicity in 2012 is due to the installation of new seismic stations on rock sites, which lead to underestimation of M-L.
机译：Wu和Chiao（2006）在1999年M-w 7.6 Chi-Chi地震发生之前，曾报道台湾发生了严重的地震静息。中央气象局（CWB）报告的2012年地震目录中也观察到了类似的活动。对于M-L> = 2.0的地震，2012年目录中的七个月的月度地震活动率似乎低于一个低于平均值（673 +/- 82）的标准差。在这里，我们检查了台湾的地震台网，发现自2012年以来，台湾中央气象局地震台网（CWBSN）合并了一些新的地震台站，包括台湾地震台宽带阵列（BATS）。这些BATS台站中的大多数位于硬岩场地，由于其场地特征，可能会影响震级估算。为了考虑场地效应的影响，收集了1994年至2014年期间的地震目录数据，并为每个站点计算了站点校正。在这项研究中确定的测站校正与该地区的地质环境之间发现了很强的相关性。位于土壤场地的测站具有较高的放大率，且测站校正为负数。另一方面，位于硬岩场地上的测站放大率较低，且测站校正为正。在进行站校正后，发现平均地震活动率为每月716个事件，对于M-L> = 2.0的地震，其标准偏差为76个事件。我们得出的结论是，2012年地震活动明显偏低的原因是由于在岩石场地上安装了新的地震台，这导致了对M-L的低估。

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