摘要
本文介绍1988年11月6日澜沧—耿马7.6、7.2级强震的短期和临震异常情况,研究了短临阶段异常群体的综合特征。短期阶段全省计有地磁Z、水化、水位、水温、地应力、定点形变等6类22个台项异常,占6类手段总台项的28％,且异常形态复杂。临震阶段计有水温、水位、水氡、磁偏角、定点形变等5类14个台项异常,占5类手段总台项的23％。短期阶段部分中期异常出现准同步转折,与此同时新异常台项月频次出现同步增加的现象,将它定义为配套性短期异常,这一特征可以作为异常发展进入短期阶段的判据。1988年10月新异常台项月频次较短期阶段最高的8月(8台项)增大近1倍,达15台项,这一特征可作为临震阶段的判据。
This paper introduced the short-term and impending anomalies of Lancang-Gengma earthquakes M1.6 and M7.2 occurred on November 6, 1988 and studied the synthetic features of the short-term and impending anomaly group. 22 station-items of the short-term anomlies of six observational types appeared in the province, including geomagnetism Z, hydrochemi-stry, water level, water temperature, stress and fixed-point deformation, they accounts for 28% of total station-items of six observational types; the anomaly forms are very complicated. There are 14 station-items impending anomaliies of five observational types, including water temperature, water level, water radon, geomagnetic declination and fixed-site deformation, they make up 23% of the total station-items of five observational types. During the short-term stage, part of the medium-term anomalies show quasi-synchronous turning while the monthly frequency of new anomaly station-items show synchronous increase. This phenomenon is defined as the complement short-term anomaly, which can be regarded as a criterion for the anomaly development entering the short-term stage. The monthly frequency of new anomaly sta- . tion-items in October, 1988 is almost double of that in the highest August (8 station-items), which can be used as a criterion for the impending stage.
出处
《地震》
CSCD
北大核心
1992年第5期13-20,共8页
Earthquake
