摘要
长安二中探槽是在地面地质调查、浅层地震和钻探的基础上开挖的,探槽中有丰富的砂土液化现象,根据液化砂脉的切割关系,判断有4次古地震事件的发生。根据探槽中地层没有明显错动和临潼-长安断裂带在晚更新世晚期和全新世早期活动较弱,以及历史上无6级以上地震活动记录的特点,本文认为4次古地震事件与临潼-长安断裂带无关,该断裂未来发生强震的危险性不大。
The exploratory trench at No. 2 Middle School of Changan is excavated on the basis of surface geological survey and seismic exploration and boring at shallow depths. Several sand liquefaction events are found in exploratory trench. Based on the abutting relationship of the liquefied ore belts, four paleoearthquake events can be recognized. Our results suggest that these four paleoearthquake events have relation with the activity of Lintong-Chang＇an fault zone which is then believed to have no strong seismic risk in the future.
出处
《震灾防御技术》
2007年第2期137-146,共10页
Technology for Earthquake Disaster Prevention
基金
国家发展和改革委员会"城市活断层试验探测项目"(20041138)资助
关键词
临潼-长安断裂带
古地震
地震危险性评价
探槽
Lintong-Chang＇an fault zone
Paleoearthquake
Seismic risk evaluation
Trenching
