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Locating Small Aftershocks Using a Small-Aperture Temporary Seismic Array

机译：使用小孔径临时地震阵列定位小余震

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摘要

In this paper, we developed a specialized method to locate small aftershocks using a small-aperture temporary seismic array. The array location technique uses the first P arrival times to determine the horizontal slowness vector of the incoming P wave, then combines it with S–P times to determine the event location. In order to reduce the influence of lateral velocity variation on the location determinations, we generated slowness corrections using events well-located by the permanent broadband network as calibration events, then we applied the corrections to the estimated slownesses. Applications of slowness corrections significantly improved event locations. This method can be a useful tool to locate events recorded by temporary fault-zone arrays in the near field but unlocated by the regional permanent seismic network. As a test, we first applied this method to 64 well-located aftershocks of the 1992 Landers, California, earthquake, recorded by both the Caltech/USGS Southern California Seismic Network and a small-aperture, temporary seismic array. The average horizontal and vertical separations between our locations and the well-determined catalogue locations are 1.35 and 1.75 km, respectively. We then applied this method to 132 unlocated aftershocks recorded only by the temporary seismic array. The locations show a clear tendency to follow the surface traces of the mainshock rupture.
机译：在本文中，我们开发了一种使用小孔径临时地震阵列定位小余震的专门方法。阵列定位技术使用前P个到达时间来确定入射P波的水平慢度矢量，然后将其与S-P个时间组合以确定事件位置。为了减少横向速度变化对位置确定的影响，我们使用永久宽带网络定位良好的事件作为校准事件来生成慢度校正，然后将校正应用于估计的慢度。慢度校正的应用显着改善了事件位置。该方法可以是一种有用的工具，可用于定位由近场中的临时断层带阵列记录的事件，而不受区域永久地震网的定位。作为测试，我们首先将此方法应用于由加州理工学院/ USGS南加州地震台网和小孔径临时地震台阵记录的1992年加利福尼亚州兰德斯地震的64条位置良好的余震。我们的位置与确定的目录位置之间的平均水平距离和垂直距离分别为1.35公里和1.75公里。然后，我们将此方法应用于仅由临时地震阵列记录的132个未定位余震。这些位置显示出明显的趋势，跟随主冲击破裂的表面痕迹。

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