【摘要】 四川省广元市朝天区是汶川8.0级地震的重灾区之一,由地震触发的崩塌、滑坡等次生地质灾害对人民群众生命财产安全构成巨大威胁。基于实地调查,对震后地质灾害隐患点进行了统计分析,指出了地震地质灾害的分布特征,并对其影响因素进行了深入分析。区内地震地质灾害点多分布在海拔800 m以上的陡坡或陡崖部位,并沿龙门山断裂带、嘉陵江水系及交通路线呈线状或带状分布。地震地质灾害的发生是内外力共同作用结果,其中地震力和断裂构造带对地质灾害发生起着决定性的作用,而地层岩性对灾种起关键性的作用,滑坡多发育在页岩、片岩、板岩、千枚岩等软岩分布区,崩塌多发育在灰岩、砂岩等硬岩分布区。更多还原

【Abstract】 Chaotian district of Guangyuan city is one of heavy disaster areas in Wenchuan earthquake.Rock collapses,landslides,debris flows and other geohazards triggered by Wenchuan earthquake,seriously threatened people lives and properties.Based on field survey in Chaotian district,statistical analysis of the points with hidden geohazards is made.The distribution characteristics of seismogeological disasters and their influencing factors are analyzed.The seismogeological hazard sites mainly distributed on steep slopes or cliffs at altitudes of over 800 meters in linear or zonal patterns along Longmen fault zone,Jialing River and traffic lines.Seismogeological disasters are the results of joint action of internal and external forces.Faults and seismic force play a decisive role,while stratum lithology determined the types of disasters.Most landslides developed in the area of soft rock,such as shale,schist,slate and phyllite,and most collapses developed in the area of hard rock,like limestone and sandstone.更多还原