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前言 1986年8月12日18时45分48.9秒,四川省盐源县发生了M_S=5.4级地震。四川省地震局西昌地震中心站测定(使用中心站所属台网和云南邻近台资料)震中位置为北纬27°25′00″,东经101°25′41″,震源深度15千米。在此地震之前,相继发生了7月10日,8月11日,8月12日的M_S为5.1、4.2、4.8级地震。四次主要地震震中距盐源地震台均在20千米范围以内,即
Preface On August 12, 1986, at 18:45 and 48.9 seconds, an M_S = 5.4 earthquake occurred in Yanyuan County, Sichuan Province. The epicenter was measured at 27 ° 25’00 “north latitude, 101 ° 25’41” east longitude and 15 km deep at the focal point for the Xichang Earthquake Central Station of the Sichuan Seismological Bureau (using the network of the station to which the central station belongs and the neighboring stations of Yunnan Province). Prior to this earthquake, M_S 5.1, 4.2 and 4.8 earthquakes occurred successively on July 10, August 11 and August 12. Four major epicenter epicenter distance from the salt seismic stations are within 20 km range, that is