地震前后垂直形变场动态演化的量化指标

QUANTIZED INDEX OF EVOLUTION OF VERTICAL DEFORMATION FIELD BEFORE AND AFTER EARTHQUAKE

提出一种表达垂直形变场动态演化过程的量化指标———区域应变率、应变集中度。在此基础上 ,对南北地震带各水准监测区近 30年的垂直形变资料进行了实际计算 ,并结合具体震例进行了对比研究。结果表明 :量化指标在一定程度上能够反映地震前后形变场的动态演化过程和地壳运动状态 。

A quantized index of evolution of the vertical deformation field--the areal average crustal strain rate, the areal crustal strain concentration degree is put forward. By calculating the vertical deformation data of all level monitoring regions in the North South seismic belt for near 30 years,and studying some practical earthquake examples,it shows that the quantized index reflects evolution of the vertical deformation field and the state of crustal movement before and after the earthquake in a certain extent. Consequently,the quantized index is significant for medium term earthquake prediction.