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1979年3月15日云南普洱县勐先一带发生了6.8级地震,它造成山崩地裂,房倒屋塌,死伤60余人震中烈度达9度。1981年9月19日该地又发生了5.9级地震、它加重了6.8级地震造成的岩层结构破坏及地表裂缝。 1984年7月,这里连降暴雨,上、中旬降水量达416.8毫米,其中13日1点到20点降水118.2毫米,造成山洪暴发,大量滑波、崩塌、泥石流相继发生,使勐先河水位
On March 15, 1979, a magnitude 6.8 earthquake occurred in Mengxian, Pu’er County, Yunnan Province. The earthquake caused landslides and landslides, collapsed houses and destroyed more than 60 people with casualties of more than 9 degrees. On September 19, 1981, another 5.9 earthquakes occurred in this area, which aggravated the rock structure damage and surface cracks caused by the 6.8 magnitude earthquake. In July 1984, there was heavy rain here and the precipitation in the middle reaches was 416.8 millimeters, of which 118.2 millimeters were precipitated at 1 o’clock to 20 o’clock on the 13th, resulting in flash floods, a large number of slippery waves, collapses and debris flows that led to Meng Xianhe water level