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四川是多发地震的省区。据现有资料统计,自公元前111年至1977年,共发生强度 M≥4.7级地震247次,其中M=7—7.9级13次,M=6—6.9级40次,M=5—5.9级135次。据震源深度资料统计,强震主要集中在10—24公里地壳内,其中 M≥7级地震,全部在10—15 公里范围内,M≥6<7级地震,除个别外,多在10公里左右,全部属于浅源构造地震。地震是现今地壳活动的表征。因此,对于现今活动构造的鉴别与研究,已成为地震研究的基础。本文试图从鉴别现今活动构造,厘定现今活动构造体系入手,借以闸明四川地震活动的统一机制。
Sichuan is a province of many earthquakes. According to the existing statistics, a total of 247 earthquakes of magnitude M≥4.7 occurred from 111 BC to 1977, of which M = 7-7.9 13 times, M = 6-6.9 40 times, M = 5-5.9 Level 135 times. According to the statistics of focal depth data, the strong earthquakes mainly concentrated in the crust of 10-24 km, of which M ≥ 7 earthquakes, all in the range of 10-15 km, M≥6 <7 earthquakes, except for a few others, more than 10 km Around, all belong to the shallow source tectonic earthquake. Earthquakes are a sign of current crustal activity. Therefore, the identification and research of the current tectonics has become the foundation of earthquake research. This paper attempts to identify the structure of today’s activities, determine the structure of today’s activity system to start, in order to brake a unified mechanism of seismic activity in Sichuan.