Formation Cause of a Heavy Mud-rock Flow Calamity on May 31 in Southern Gansu Province
Wang Xiwen1 Feng jun2 Zhang Tiejun1 Liu Zhiguo1 Fu Xiaohong1 (1. Lanzhou Central Meteorological Observatory, Gansu Lanzhou 730020; 2. The Meteorological bureau of Longnan Area, Gansu Longnan)
An enormous mud-rock flow calamity broke out in Min and Dangchang County, Gansu Province on May 31, 2000. The loss of the event are 76% of the total of the landslide and mud-rock flow calamity in Longnan in the last 20 years(1980—1999). The formation causes and climate conditions of geological calamity in Longnan are analyzed.
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