Detection of crustal deformation from the Landers earthquake sequence using continuous geodetic measurements
Detection of crustal deformation from the Landers earthquake sequence using continuous geodetic measurements
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DOI：
10.1038/361337a0
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发表时间：
1993-01
期刊：
影响因子：
64.8
通讯作者：
Y. Bock;D. Agnew;P. Fang;J. Genrich;B. Hager;T. Herring;K. Hudnut;R. King;S. Larsen;J. Minster;K. Stark;S. Wdowinski;F. Wyatt
中科院分区：
文献类型：
--
作者：
Y. Bock;D. Agnew;P. Fang;J. Genrich;B. Hager;T. Herring;K. Hudnut;R. King;S. Larsen;J. Minster;K. Stark;S. Wdowinski;F. Wyatt
技术活跃地区的地壳运动测量越来越多地通过基于卫星的全球定位系统 (GPS)1,2 进行，与传统的大地测量技术相比，它具有相当大的优势3,4。日本中部5,6和加利福尼亚州南部建立了连续运行的GPS阵列，其地面接收器相距数十公里，以监测地壳变形的空间和时间细节。在此，我们报告了南加州连续运行的 GPS 网络永久 GPS 大地测量阵列 (PGGA)7-9 对大地震的首次测量。通过每日观测来监测 1992 年 6 月 28 日发生的兰德斯地震（Afw 7.3 级）和大熊地震（Mw6.2）。以地震事件为中心的十周测量结果表明，所有 PGGA 站点均存在显着的同震运动，其中一个站点在地震发生后两周内存在显着的震后运动，但没有显着的震前运动。这些测量结果证明了 GPS 监测在精确检测近场和远场前兆和余震地震变形方面的潜力。
THE measurement of crustal motions in technically active regions is being performed increasingly by the satellite-based Global Positioning System (GPS)1,2, which offers considerable advantages over conventional geodetic techniques3,4. Continuously operating GPS arrays with ground-based receivers spaced tens of kilometres apart have been established in central Japan5,6and southern California to monitor the spatial and temporal details of crustal deformation. Here we report the first measurements for a major earthquake by a continuously operating GPS network, the Permanent GPS Geodetic Array (PGGA)7–9in southern California. The Landers (magnitude Afw of 7.3) and Big Bear (Mw6.2) earthquakes of 28 June 1992 were monitored by daily observations. Ten weeks of measurements, centred on the earthquake events, indicate significant coseismic motion at all PGGA sites, significant post-seismic motion at one site for two weeks after the earthquakes, and no significant preseismic motion. These measurements demonstrate the potential of GPS monitoring for precise detection of precursory and aftershock seismic deformation in the near and far field.