同震阶变异常的特征与机制分析  

ANALYSIS OF FEATURE AND MECHANISM ON ANAMOLY OF COSEISMIC STEP CHANGE

作　　者：李兰生[1] 刘建华[1] 

机构地区：[1]江苏省地震局徐州地震台,221008

出　　处：《地壳形变与地震》1992年第3期81-87,共7页Crustal Deformation and Earthquake

摘　　要：本文对徐州地震台JB—72水平摆倾斜仪1988年11月至1989年5月间所记录到的24次同震阶变进行了深入分析,认为:a.造成同震阶变的原因是多方面的,而反应了地球应变场准静态调整的同震阶变才是有价值的价变异常;b.多观测手段的地震台站,同震阶变应该在不止一台仪器上得到响应。Twenty-fuor coseismic step changes, recorded by JB-72 pendulum tiltmeter at Xuzhou station from November, 1988 to May, 1989, are thoroughly analysed in this paper. According to the obtained results, it is considered that (1) the coseismic step change is caused by many sources, but only one that reflectes the quasi-static adjustment of strain field in the earth is the valuable ccseismic step change; (2) the coseismic step change should be responded by not only one instrument in the station with various means.

关 键 词：同震阶变 倾斜仪 地震 地震前兆 

分 类 号：P315.7[天文地球—地震学]