Preseismic and Postseismic Analysis of GPS and TrilaterationData at Loma Prieta

这项研究是利用美国地质调查局收集的数据分析洛马普里塔地震附近地区的地壳形变：一个震源将是自20世纪70年代初以来测量的S大地经纬仪三边网，另一个震源将是自1985年以来一直测量的全球定位系统网。除了在Loma Prieta附近的实验外，还将与美国地质调查局合作，在旧金山湾区1882至1887年和1906年调查的三角测量点获取GPS读数。这些测量将使人们能够确定1989年的洛马普里塔地震与1906年的旧金山地震有何不同。这项研究是国家减少地震灾害计划的一部分。

This research is to analyze the crustal deformation of the region close to the Loma Prieta earthquake by using data collected by the U.S. Geological Survey: one source will be the geodolite trilateration network measured since the early 1970's, another source will be the Global Positioning System network that has been surveyed since 1985. In addition to the experiments near Loma Prieta, GPS readings will be taken in cooperation with the USGS at triangulation sites that were surveyed in the San Francisco Bay Area in the years 1882 to 1887 and in 1906. These measurements will enable the determination of how the 1989 loma Prieta earthquake differed from the 1906 San Francisco earthquake. This research is a component of the National Earthquake Hazard Reduction Program.