GNSS在天津地震监测中的发展与初步应用

近年来,GNSS观测技术在天津地区获得了迅速发展.截止目前,天津已建成由11个连续GNSS观测站组成的地壳运动观测网,并获得超过2年的连续GNSS观测资料.本文详细阐述了以GNSS观测技术为主要观测手段的天津市地壳运动观测网络的组网过程和布网原则,并对其数据处理结果进行了初步分析.结果表明,天津市地壳运动观测网能够满足mm级地壳运动监测的要求.其对日本“3.11”地震有较强反应,远场同震位移幅度达到7-9mm;同时GNSS连续站可成功观测到站点地面沉降变化趋势,最大年沉降量接近100mrn/a.

Development and Application of GNSS Observation in Earthquake Research in Tianjin

In recent years,GNSS observation system in Tianjin has been developed rapidly.Until now,a crustal movement observation network of 11 continuous GNSS observation stations has been built up,and the continuous GNSS data has accumulated for more than 2 years.This paper elaborated the construction and networking principles of Tianjin Crustal Movement Observing Network,which is based on GNSS observation technology.By analyzing the preliminary GNSS data we found that the network can meet the need of monitoring movements of the crust to a millimeter in scale in Tianjin.Coseismic dislocation of the Japan Tohoku 9.0 earthquake has been detected as much as of 7-9 mm,with the maximal land subsidence change of the stations of 100mm/a.