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据云南省电信传输地震台网和全国地震台网速报测定,1985年4月18日13时52分53秒在北纬25°50′、东经102°51′,发生一次6.1级地震。震中位于禄劝县转龙区境内,震源深度5至10公里。据云南省地震局核定,该次地震后2分多钟随即发生一次4.9级强余震,也是迄今最强的一次余震。初步统汁,6.1级地震发生后9天中共发生1.7级以上地震近600次,其中4级以上余震23次。
According to the determination of Yunnan Telecommunication Transmission Seismograph Network and National Seismograph Network Express, a 6.1 magnitude earthquake occurred at 13:52:53 on April 18, 1985 at latitude 25o50 ’north latitude and longitude 102o51’ east longitude. Epicenter is located in Luquan County, Luquan County, the focal depth of 5 to 10 km. According to the approval of the Seismological Bureau of Yunnan Province, a magnitude 4.9 aftershock occurred immediately after 2 minutes of the earthquake and is by far the strongest aftershock. Preliminary statistics show that there were nearly 600 earthquakes of magnitude 1.7 or above in the CCP 9 days after the 6.1 magnitude earthquake, of which 23 were aftershocks of magnitude 4 or above.