利用地震矩张量与GPS资料推算中国大陆现今地壳运动能量分布特征  

Use Seismic Moment Tensor and GPS Data to Analyse the Recent CrustalM ovement Energy Distribution Characteristics of China Continent

作　　者：荆燕[1] 李宏[1] 熊玉珍[1] 范良龙[1] 张世中[1] 孙起伟[1] 董建业[1] 刘凤秋[1] 王海忠[1] 

机构地区：[1]中国地震局地壳应力研究所,北京100085

出　　处：《高校地质学报》2009年第1期108-114,共7页Geological Journal of China Universities

基　　金：中国地震局地壳应力研究所基本科研业务专项(编号ZDJ2007-19)资助

摘　　要：在一次地震轮回时间段内,对于某个相对统一和完整的体系,应变能的积累与释放基本等量。地震资料得到的地壳变形场是现今地壳应变能已得到释放后的一种表现,而GPS资料得到的地壳变形场中则既包含地壳应变能量的释放量,也包含积累量。结合中国大陆及其邻区的地质构造与活动地块分布特点,将研究区划分为32个独立的分区。在此基础之上,利用地震和GPS资料分别计算得到了两组单位体积能量积累率,并对其进行了比较分析。研究表明,本次地震轮回中大多数区域的地壳应变能量已基本释放完毕,我国境内只有青藏北部、川滇、昆仑、阿尔金等几个地区的地壳应变能量积累偏高,仍具有发生较强地震的可能性,是今后地震预测研究应该重点关注的地区。For a relatively unified and integrated system, the acumulated energy and released energy are basically equal in a cycle of earthquake activity. The crustal deformation fields inferred from earthquake data represent the results of strain energy that had been released. On the other hand, the deformation fields inferred from GPS data represent the strain energy summation of accumulated energy and released energy. According to the geotectonic and active blocks distribution characteristics in China continent and its neighborhood, 32 subregions are subdivided. On this basis, two groups of unit volume energy accumulated rate are calculated and compared with each other in this paper. It can be concluded that crustal strain energy of most areas in our research are released ultimately. Only in the North Tibet, Sichan-Yunnan, Kunlun and Altyn areas, the probability of strong earthquakes is greater. More attention should he paid to these areas.

关 键 词：应变能积累 地震矩张量 强震区预测 地壳运动 

分 类 号：P546[天文地球—构造地质学]