应变异常分析与临震预报探讨

ANALYSIS ON STRAIN ANOMALY AND DISCUSSION ON IMPENDING EARTHQUAKE PREDICTION

摘要:

就库尔勒台用高精度RZB-1型宽频带数字应变仪先后在500 km范围内记录到的几次较典型的M_S5.5左右地震的前兆异常作了初步分析与探讨.结果发现,震前测值曲线异常形态虽说各有所不同,但却有一些共同的特征:固体潮畸变,应变速率加快,易出现临震突跳,应变阶跃等.根据这些特征,我们对1993年2月3日和静M_S5.7地震、1993年10月2日若羌M_S6.6地震和1996年1月9日沙湾南M_S5.4地震作了不同程度的预报.

Abstract:

Primary analysis and discussion on some typical earthquake precursor anomalies which appear in the range of 500 km are done according to the data recorded by the RZb-1 type digital strain gauge with high precision and broad channel.The results show that though there are some differences on the observed curve anomaly forms before the earthquake,there also exist some same characteristics such as solid tide distortion,strain rate increase,impending earthquake abrupt anomaly,strain step,etc.According to these characteristics,authors predicted the earthquakes,for example,the Hejing M_S5.7 earthquake on Feb.3,1993,the Ruoqiang M_S6.6 earthquake on Oct.2,1993 and the south Shaw an M_S 5.4 earthquake on Jan.9,1996.