The U.S./China Joint Research on the Variation of Gravity and the Occurrence of Earthquakes in the BTTZ Region, P.R.C.

作为北京中国地区地震灾害项目的一部分，这项研究将继续进行重力监测。通过安装在半永久性地点的8台地球动力学TRG-1型潮汐重力仪以及定期使用3台拉科斯特-龙贝格G型重力仪定期访问的若干台站监测重力。该监测计划始于1981年，作为美国/中国地震研究议定书的一部分，一直持续到现在，从而形成了十多年来宝贵的连续记录。重力与海拔变化和地壳下物质运动有关，这被认为是地震准备过程的一部分。北京周边地区被中华人民共和国地震危险性规划指定为中国下一次大地震的高概率地区之一。这项研究是国家减少地震灾害计划和美国/中国地震研究议定书的组成部分。

This research is to continue gravity monitoring as part of an earthquake hazards program in the Beijing region of China. Gravity is monitored by means of eight Geodynamics TRG-1 tidal gravimeters installed at semi-permanent sites, and at a number of stations visited periodically with three LaCoste-Romberg Model G gravimeters. The monitoring program was begun in 1981 as part of the U.S./PRC Protocol on Earthquake Studies and has continued to the present, thus forming a valuable continuous record exceeding ten years. Gravity is related to elevation changes and subcrustal mass movements that have been proposed to be a part of the process of preparation for earthquakes. This region surrounding Beijing is designated by the PRC earthquake hazard program as one of high probability for the next major earthquake in China. This research is a component of the National Earthquake Hazard Reduction Program and the U.S./PRC Earthquake Studies Protocol.