大震前沂沭断裂带定点水准的中、短期异常特征  

CHARACTERISTICS OF MIDDLE AND SHORT TERM ANOMALIES OF FIXED POINT LEVELLING IN SHANDONG BEFORE LARGE EARTHQUAKE

作　　者：李杰[1] 

机构地区：[1]山东省地震局,250021

出　　处：《地壳形变与地震》1992年第3期88-94,共7页Crustal Deformation and Earthquake

摘　　要：采用滑动平均值、动态灰箱和带控制项自回归等方法对海城、唐山地震前后山东的定点水准观测资料做了处理。结果表明,长趋势正常背景下的中、短期异常达最大值,或者异常恢复过程中发震,并完成“∩”或“∪”型的变化过程,然后恢复到基值附近。分析结果还表明,安丘-莒县断裂与沂水-汤头断裂在两次大震前运动方式相反。In this paper, the observed data of fixed point levelling in Shandong province before and after the Haicheng and Tangshan earthquakes are handed based on the method of sliding mean, dynamic greybox and self-regression with controller. The results show that the earthquakes occur when the middle and short term anomalies under long trend normal background reach the maximum or return to normal, and that after a U or ∩ process the observed values are back to normal nearly. According to the analysis of the deformation features, it is indicated that the motion way of both Anqiu-Juxian and Yishui-Tangtou faults is opposite before two large earthquakes.

关 键 词：定点水准 断裂带 地震 观测 

分 类 号：P315.7[天文地球—地震学]