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一、概论四川地区地震活动频度较高,强度较大.自公元前111年至1988年6月10日,境内共发生7.0～7.9级地震13次,6.0～6.9级地震42次,5.0～5.9级地震143次.其中1970年以来就发生了7.0～7.9级地震3次,6.0～6.9级地震9次,5.0～5.9级地震63次.1970年以来6级以上地震的空间分布如图1所示。1970年大邑6.3级地震以后,四川省成立地震监测机构,陆续布设了一批地震前兆观测台网。至1984年底,共建成专业地震台30个(其分布见图1),具有包括测震、视电阻率、地磁、水氡,地倾斜,定点重力,电感应力等共计73项前兆观测项目。还建有15个
I. INTRODUCTION There is a high frequency and intensity of seismic activity in Sichuan Province. From 111 BC to June 10, 1988, there were 13 earthquakes of 7.0-7.9 magnitude, 42 magnitude 6.0-6.9 earthquakes, 5.9 earthquakes of magnitude 5.9, of which 7.0 to 7.9 earthquakes occurred three times since 1970, 9 earthquakes from 6.0 to 6.9 earthquakes and 63 earthquakes from 5.0 to 5.9 earthquakes. The spatial distribution of earthquakes above M6.0 since 1970 is shown in Figure 1 As shown. After the Dayi earthquake of magnitude 6.3 in 1970, an earthquake monitoring agency was set up in Sichuan Province, and a number of earthquake precursor observation networks were successively set up. By the end of 1984, a total of 30 specialized seismic stations have been established (see Figure 1 for distribution), with a total of 73 precursor observations including seismic survey, apparent resistivity, geomagnetism, water radon, ground tilt, fixed point gravity and inductive stress. There are also 15 built