四川活断层探测新进展

Surveying and Prospecting of Active Fault of Sichuan Province

四川活断层普查项目是四川省政府在“十三五”期间建设的重点项目之一,历时5年,项目完成了四川省1∶250000活动断层普查、7条断层的1∶50000活动断层地质填图、11个城镇的1∶10000城市活动断层探查和四川省活断层信息系统的建设。该项目新发现了五道梁-长沙贡玛、松岗、达朗松沟等9条断裂晚更新世或全新世活动的地质地貌证据,编制了全省1∶250000活动断层地质图,编制和修订了成都平原和若尔盖盆地第四系等厚线图。这些新成果不仅为地方抗震设防、国土规划、重大工程选址、地震应急处置等方面提供了基础支撑,也为深入研究青藏高原东缘动力学机制和孕震构造环境提供了支撑。

The surveying and prospecting of active fault of Sichuan province is one of the key projects implemented by the Sichuan Provincial Government during the“13th Five-Year Plan”period.Over the course of five years,the project has completed the 1:250,000 active fault survey,1:50,000 geological mapping of seven faults,1:10,000 urban active fault investigation in 11 cities,and the construction of the active fault information system in Sichuan Province.The project has newly discovered the late Pleistocene or Holocene activity of nine faults,including Wudaoliang-ChangshaGongma,Songgang,Dalangsonggou faults,etc..It has compiled a 1:250,000 active fault geological map of the entire province and revised thick-line maps of the Quaternary series in the Chengdu Plain and the ZoigêBasin.These new achievements not only provide fundamental support for local earthquake resistance design,land planning,site selection for major projects,and seismic emergency response,but also offer rich basic data for further studies on the dynamic mechanisms and seismic tectonic environments of the eastern margin of the Qinghai-Tibet Plateau.