华北地区GPS监测网建设、地壳水平运动与应力场及地震活动性的关系

Establishment of the GPS Monitoring Network in North China and Relationship between the Crustal Horizontal Motion and the Stress Field and Seismicity

简要地介绍了华北地区、特别是首都圈ＧＰＳ地震监测网的布设、观测、数据处理方案和监测精度等，较详细地分析了地壳水平形变与构造运动、应力场变化以及地震活动性的关系。分析表明：ＧＰＳ测量的精度达到了１０－９量级，华北地区地壳水平形变年速率约为４～５ｍｍ，地壳的水平运动是区域应力场的直接反映，监测地壳水平运动的时序变化可以研究应力场的变化、分析地震活动趋势、判定地震的孕育地区。

A general description about arrangement,observation,data processing and precision of GPS seismic monitoring network in North China,especially the Capital circle area is given in the paper,and a detailed analysis for the relationship between the crustal horizontal deformation and the structural motion,change in stress field and seismicity is made.The analysed results shown that the high precision of 10-9 have been achieved in GPS measurements,the rate of crustal horizontal deformation in North China is about 4～5mm/a.The crustal horizontal motion is a direct reflection of regional stress field.By monitoring the temporal variation in crustal horizontal motion,we can study the change in stress field,analyse the tendency in seismicity and search for the seismogenic zone.