Distribution Regularity and Disaster Mode of Secondary Mountain Hazards Induced by the Ludian Earthquake in Longquan River Basin
JIA Li-rong
GE Yong-gang
CHEN Xing-chang
JIANG Xing-yuan
GUO Ya-yong
LIU Chuan-zheng
Abstract：Taking Longtoushan-Tianshengqiao of Longquan river basin in Ludian as study area,using im-age interpretation and field investigation data,this paper discusses the distribution regularity and disaster mode of secondary mountain hazards reduced by Ludian earthquake.The results show that :(1) The sec-ondary mountain hazards are mainly caused by the secondary faults at the Longquan river right bank and the extension of Baogunao-Xiaohe fault(Xiashuigou strike-slip faults).The distance between Longquan riv-er and the faults is smaller than two kilometers,which result in the 4.125/km maximum density of moun-tain hazards ;(2) The mountain hazards mainly took place on the bulge slope,account for 46.3%,and fur-thermore,the hazards are more likely to take place on slopes of the back of faults ;(3) 60% of the collap-ses and landslides develop in the surface residual layer,and 40% of rocky landslide collapses are hard lime-stone,dolomite and breccias ;(4) The secondary mountain hazards mode are as follows :damaging roads, interrupting traffic,forming barrier lakes which inundate upstream bed,damaging downstream bed and fa-cility and buildings along the river.
Keywords：Ludian earthquakesecondary mountain hazardsdistribution regularitydisaster modeLongquan river
Publication Date：2016-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 41-46 )