陕西省南郑县地震次生地质灾害特征及其防治

陕西省南郑县地处龙门山大断裂北东延伸方向,距汶川5.12特大地震震中映秀镇约350Km。该县震前共有地质灾害点144处,呈现出突发性、链生性、地域性和季节性的发育规律。此次地震在南郑县境内诱发多起地质灾害,新诱发地质灾害隐患点11处,已经发生2起地质灾害;在震前的133处地质灾害隐患点中,有3处在地震后明显加剧。根据此次所排查的地质灾害的潜在危险性和险情大小的评估,圈定了重点防治区,提出了监测预警、灾害避让搬迁和灾害治理的防治建议。

Earthquake Secondary Geological Hazard Features and Control in Nanzheng County,Shaanxi Province

The Nanzheng County, Shaanxi Province is situated at northeast extending of the Longmenshan major fault, apart from May 12th great earthquake epicenter Yingxiu Township about 350km. Before the earthquake the county has 144 geological hazard points, presented paroxysmal, chain-reacting, regional and seasonal patterns of development. The Wenchuan earthquake had induced many geological hazards in the county, 11 newly induced geological hazard hidden trouble areas, 2 geological hazards had happened; among 133 geological hazard hidden trouble areas before the earthquake, 3 areas were intensified obviously after the earthquake. Based on this investigation estimated geological hazard potential risks and dangerous condition extent, delineated high lighted control/ing areas, put forward controlling suggestions on monitoring, early warning, disaster dodging relocation and disaster governing.