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首页> 外文期刊>Journal of Asian earth sciences >Very short-term earthquake precursors from GPS signal interference based on the 2013 Nantou and Rueisuei earthquakes, Taiwan
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Very short-term earthquake precursors from GPS signal interference based on the 2013 Nantou and Rueisuei earthquakes, Taiwan

机译：基于2013年南投和瑞穗地震的GPS信号干扰造成的极短期地震前兆

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摘要

We set up a GPS network with 17 Continuous GPS (CGPS) stations in southwestern Taiwan to monitor real-time crustal deformation. We found that systematic perturbations in GPS signals occurred just a few minutes prior to the 2013 Nantou (M-L = 6.5) and Rueisuei (M-L = 6.4) earthquakes in Taiwan. The anomalous pseudorange readings were several millimeters higher or lower than those in the background time period. These systematic anomalies were found as a result of interference of GPS L-band signals by electromagnetic emissions (EMS) prior to the mainshocks. The EMs may occur in the form of harmonic or ultra-wide-band radiation and can be generated during the formation of Mode I cracks at the final stage of earthquake nucleation. We estimated the directivity of the likely EM sources by calculating the inner product of the position vector from a GPS station to a given satellite and the vector of anomalous ground motions recorded by the GPS. The results showed that the predominant inner product generally occurred when the satellite was in the direction either toward or away from the epicenter with respect to the GPS network. Our findings suggest that the GPS network may serve as a powerful tool to detect very shortterm earthquake precursors and presumably to locate a large earthquake before it occurs. Nevertheless, a direct measurement of EMs at the site of the GPS array is required in future studies to confirm this hypothesis. (c) 2015 Elsevier Ltd. All rights reserved.
机译：我们在台湾西南部建立了17个连续GPS（CGPS）站的GPS网络，以实时监测地壳变形。我们发现，在台湾2013年南投（M-L = 6.5）和瑞穗（M-L = 6.4）地震发生前几分钟，GPS信号发生了系统性扰动。异常伪距读数比背景时间段的读数高或低几毫米。这些系统异常是由于主震之前GPS L波段信号受到电磁辐射（EMS）的干扰而导致的。 EM可能以谐波辐射或超宽带辐射的形式出现，并可能在地震成核的最后阶段形成I型裂纹时产生。我们通过计算从GPS站到给定卫星的位置矢量与GPS记录的异常地面运动矢量的内积，来估计可能的EM源的方向性。结果表明，相对于GPS网络，当卫星朝向震中或远离震中时，通常会产生主要的内积。我们的发现表明，GPS网络可作为检测非常短期的地震前兆并可能在发生大地震之前定位的强大工具。然而，在未来的研究中需要直接测量GPS阵列现场的EM来证实这一假设。 （c）2015 Elsevier Ltd.保留所有权利。

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