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首页> 外文期刊>Journal of Asian earth sciences >The seismogenic deformation and Qp temporal variation before the M6.2 Mingjen earthquake, Taiwan
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The seismogenic deformation and Qp temporal variation before the M6.2 Mingjen earthquake, Taiwan

机译：台湾明真M6.2级地震前的地震成因变形和Qp时间变化

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摘要

Detecting anomalies before an earthquake has become an important task in seismic hazard prevention. The purpose of this research is to use the intrinsic attenuative dispersion of the P-wave, Qp, to serve as an anomaly before an earthquake. On November 5, 2009, an earthquake (M-L = 6.2; depth = 24 km) occurred in Ming-Jen, Nantou county, Taiwan. The vertical-component of the first-cycle of P-wave data recorded from the Central Weather Bureau Seismic Network from 2009/01 to 2010/01 was calculated to obtain the Qp parameter. Meanwhile, this study also utilizes global positioning system stations to examine changes in surface displacements that occurred during the Mingjen earthquake. Analysis results indicate that 2-months before the mainshock occurred; the Qp began to decrease for all stations, which implies that the crustal area became more fractured owing to a high stress accumulation. Such a lead time of 2 months is equal to the average lead time of Seismic Electric Signals (SES) activities being also compatible with a physical model suggested long ago for the SES generation. With stress accumulating a few days before the earthquake, an impeded region can be clearly identified by relatively-large difference values when the mainshock is going to occur. We conclude that the analysis of the Qp parameter and GPS index are very sensitive to changes in the stress state and may serve as a useful index in early warning of earthquake. (c) 2015 Elsevier Ltd. All rights reserved.
机译：在地震前发现异常已成为预防地震灾害的重要任务。这项研究的目的是利用P波的固有衰减色散Qp作为地震前的异常。 2009年11月5日，台湾南投县明仁发生地震（M-L = 6.2；深度= 24 km）。计算从中央气象局地震网络记录的2009年1月至2010年1月的第一波P波数据的垂直分量，以获得Qp参数。同时，本研究还利用全球定位系统站来检查明仁地震期间发生的地表位移变化。分析结果表明，主震发生前两个月。所有站的Qp开始减小，这意味着由于高应力积累，地壳区域变得更加破裂。这样的2个月的交货时间等于地震电信号（SES）活动的平均交货时间，也与很早以前为SES生成的物理模型兼容。随着地震前几天的应力积累，当要发生主震时，可以通过较大的差值清楚地识别障碍区域。我们得出的结论是，对Qp参数和GPS指数的分析对应力状态的变化非常敏感，可以作为地震预警的有用指标。 （c）2015 Elsevier Ltd.保留所有权利。

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