GENETIC ANALYSIS OF EARTHQUAKE-INDUCED GEOLOGIC HAZARDS IN GANXIGOU DRAINAGE BASIN OF PENGZHOU

Ganxigou belongs to tributaries of Qian River,in the front margin of the central Longmeng Mountain folded zone,and it belongs to erosion structural and river landforms.The valley is developing and deeply dissected,whose rainfall and river waters are rich.Geologic hazards are also developing due to widespread mining.Typical geologic hazards are mainly Dabaiyan collapse bodies,Datuanbao collapse bodies and Ganxigou potential Debris flow.Dabaiyan overthrust collapse bodies formed after Wenchuan Earthquake.After Yingxiu-Beichuan faults thrusted,hanging limestone slipped out of hillside and formed scarp.Under the gravity or the surface water flow,hanging broken material slipped from the thrust.Datuanbao deposit changed in the overall deformation modes from tipping to tip-break-accumulating at the basis of previous tipping deformation and slipped under earthquake-induced effects.Ganxigou drainage basin develops geologic hazards and formed provenance which may cause debris flow.