Research on Application of GPS Interferometry to Geodesy

这项合作研究计划通过广泛应用GPS干涉测量法，通过对GPS应用感兴趣的测地线学家和地球物理学家之间的各种合作研究，为最准确的基线估计引入测地线学和地球物理学的新时代。该项目的主要目标是：1。从全球GPS数据中检测相对板块位移，这些数据已存档于东京大学地震研究所的GPS数据和信息中心；通过开展全国GPS运动“GPS JAPAN”和组织国内GPS学术研讨会，推动GPS研究。通过本项目参与者的广泛研究工作，目前取得了以下成果：全球板块运动是通过分析在ERI的GDIC存档的全球GPS数据来检测的。这些结果表明，基线估计的最终精度可能达到6*10^<-9>.2。首先利用运动数据估计了菲律宾海板块的欧拉矢量。在最近袭击日本岛屿的大地震之后，广泛的迫在眉睫的调查发现了同震和震后地壳位移。通过本项目，出现了几个新的研究可能性，如可能的时代分析，以高时间分辨率调查位移，可能的应用运动学GPS在地壳变形或地震调查等。

This co-operative research was planned to introduce a new era in geodesy and geophysics through the extensive applications of GPS interferometry for the most accurate baseline estimates, by various co-operative reseaches among geodesists and geophysicists who are intereted in GPS applications.The primary goals of the project were ;1. to detect relative plate displacements from the global GPS data, which have been archived at the GPS Data and information Center established in the Earthquake Research Institute, University of Tokyo, and,2. to promote GPS researches through conducting the nationwide GPS Campaign "GPS JAPAN" and organizing domestic GPS symposiums.By the extensive research efforts among participants of the present project, following results were obtained so far ;1. Global plate motions were detected by analysing global GPS data that have been archived at the GDIC in ERI.This results suggested that the ultimate accuracy of the baseline estimates may reach to 6*10^<-9>.2. Euler vector of the Philippine Sea plate was first estimated using campaign data.3. Co-seismic and post-seismic crustal displacements were found by the extensive imminent surveys after the recent large earthquakes that hit the Japanese islands.Through the present project, a couple of new research possibilities emerged such as possible epochwise analysis to investigate displacements with high temporal resolution, possible application of kinematic GPS to crustal deformation or seismic survey, etc.