Research on Application of GPS Interferometry to Geodesy

这项合作研究计划通过广泛应用GPS干涉测量以获得最准确的基线估计，通过对GPS应用感兴趣的大地测量员和地球物理学家之间的各种合作研究，引入大地测量和地球物理学的新纪元。该项目的主要目标是；1.从东京大学地震研究所建立的全球全球定位系统数据和信息中心存档的全球全球定位系统数据中检测相对板块位移；2.通过开展全国全球定位系统运动“全球定位系统日本”和组织国内全球定位系统研讨会，促进全球定位系统研究。通过本项目参与者的广泛研究努力，迄今已取得以下结果：1.通过分析在全球全球定位系统中心存档的全球全球定位系统数据，探测到全球板块运动。首次利用战役资料估算了菲律宾海板块的欧拉矢量。在日本岛屿最近发生的大地震后，通过广泛的临震调查发现了同震和震后地壳位移。通过本项目，出现了一些新的研究可能性，如可能进行高时间分辨率的时相分析来研究位移，可能将动态GPS应用于地壳形变或地震调查等。

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 to detect relative plate displacements from the global GPS data, which have been archived at the GPS Data and information Center established in the Earthquake Research Institute, University of Tokyo, and,2.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 Global plate motions were detected by analysing global GPS data that have been archived at the GDIC in ERI.This results suggested that the ultimate accuracy of the baseline estimates may reach to 6*10^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.