Geological Environmental Influence of Lushan MS7.0 Earthquake in Sichuan
详细信息
- 责任者：Wang Yunsheng (State Key Laboratory of Geohazard Prevention and Geoenvironment Protection ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Quan Qing
- 刊名：Journal of Earth Sciences and Environment
- 出版年：2013
- 卷期：35(2)
- 关键词：震灾 ; seismic hazard ; 四川 ; Sichuan Province
- 页码：p.92-98
- 图表：illus., 16 refs.
- 分类号：1800
- issnNo：ISSN1672-6561
- isbnNo：CN61-1423/P
摘要
A Ms7.0 earthquake hitted Lushan county of Ya’an city,Sichuan province on April 20,2013,and the geological environmental influence of the earthquake was concerned.Based on remote sensing interpretation and field survey,the geological environmental influence of Lushan earthquake was analyzed preliminarily.The main geological environmental influences included that Lushan earthquake induced wide spread secondary avalanche mountainous disasters with small scale,which distributed along the trough valley of Shuangshi-Dachuan fracture zone and the NW gorges cutting structural belts,such as S210 provincial road Lushan-Baoxing gorge,Lushan-Shuangshi gorge and Longmen-Taiping gorge,and the distribution density of avalanche in Baoshen and Taiping towns near the epicenter was largest;the active and stable sources of debris flow were increased by avalanche because of the earthquake;the new sources of avalanche increased in the gullies and gentle slopes,and the probability of gully-shaped and slope debris flows after the earthquake increased;seismic cracking was common in the slopes,and the uneven settlement of slope surface blanket caused by vibration resulted in ground fracturing,buildingcracking,roadbed failure,etc.;sand liquefaction increased the damage,and the sand liquefaction in trough valley of causative fault caused by vibration resulted in foundation failure above the causative fault;the site effect of thick overburden layer caused the abnormal damage in the river plain which located in the footwall of earthquake,and the amplification effect of earthquake wave in thick overburden layer of footwall foreland basin caused serious collapse and crack,such as the river plain in Longmen and Qingren of Lushan county,Laochang and Renyi of Tianquan county and slope zone;the most serious area of geological environmental influence of Lushan earthquake was Taiping-Baosheng near the epicenter,the more serious area was fault zone footwall 5km to hanging wall 5km,urban area of Baoxing county and foreland basin.
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