新疆地区现今地壳垂直运动及地震活动研究

STUDY ON PRESENT-DAY VERTICAL CRUST MOVEMENT AND SEISMIC ACTIVITY IN XINJIANG AREA

用动态秩亏自由网对新疆地区1951—1969年、1976—1984年和1991—1999年3期精密水准数据进行处理,获得了新疆地区现代地壳垂直运动速率图与梯度图。以此为基础,分析了新疆地区的地壳垂直运动特征,并预测了未来地壳的垂直运动趋势。同时,利用该区自上世纪初至今百年所发生的Ms≥7强震,研究了地壳垂直运动速率和梯度变化与地震活动的关系。结果表明:在水准网覆盖的区域内,强震主要发生在地壳上升的垂直运动速率高梯度异常区带内或附近。

By processing three period sophisticated leveling data of Xinjiang, including year 1951--1969, 1976--1984 and 1991--1999 ,with the dynamic rank defect free network adjustment,we obtained the present-day crust movement rate map and gradient map and analyzed the crust vertical movement characters and predicted its future trend on the basis of the maps. Meanwhile the relations among vertical crust movement rate, vertical velocity gradient and seismic activity are analyzed with the collection of strong earthquakes（Ms≥7） since last century. The study shows that in network covered region, strong earthquakes mainly occure in or around the gradient abnormal zones with the rising crust vertical velocity rate.