基于高频GPS台网进行地壳运动监测及震中定位
首发时间:2017-05-02
摘要:利用高频GPS观测技术获取瞬时地壳运动状态已成为大地测量学和地震学领域的热点前沿。在本文研究中,结合2012年Mw 7.6哥斯达黎加尼科亚半岛地震,利用近震区若干测站的高频GPS观测数据,采用精密单点测速方法分析了强震时复杂的地表运动时序,获得了地震期间测站瞬时运动速度。为克服GPS在高频部分信噪比低,难以很好地分离地震波初至时刻信号与背景噪声,提出利用GPS速度序列峰值提取S波震相到时的方法。在此基础上,利用单纯形法和Geiger法的组合方法来确定地震震中,所得结果与其他研究成果相对比,差异在5公里范围内,初步说明了该方法的可行性。
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Instantanous movement of curst monitoring and epicenter determination based on high-rate GPS network
Abstract:High-rate GPS (HR-GPS) has become one of the effective methods to observe the dynamic crustal deformations caused by earthquake. In this study, we introduce the Doppler shift method to monitor the complex surface vibration behavior andthe instantaneous station velocity. And then we investigatethe secondary wave (S-wave) arrival picking from GPS-derived velocity history. Finally, we determine the earthquake epicenter by using the combined method of simplex method and Geiger method. The performance of the proposed approach is validated using 5 Hz GPS data collected during the 2012 Nicoya Peninsula Earthquake (Mw 7.6, 2012 September 5) in Costa Rica. It is show that the epicenter is chievable within 5 km offset different from other reference values.
Keywords: High-rate GPS station velocity Epicenter determination
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No.4729411119501214****
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基于高频GPS台网进行地壳运动监测及震中定位
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