四川雅安芦山地震灾区次生地质灾害评估及对策建议
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摘要
2013年4月20日08点02分,四川雅安芦山县发生了7.0级强震。此次地震发生的区域地形条件复杂,地震烈度大,使得震区地质条件进一步恶化,在强降雨等叠加等条件下,次生地质灾害风险显著加剧。本文收集了震区地形、地质、构造断层分布、地震烈度分布、历史灾害、降雨以及卫星影像等资料,对震区的次生地质灾害的危险性从以下3个方面进行了评估:①地震力触发下震区次生地质灾害空间分布;②不同降雨触发下震区次生地质灾害空间分布及趋势分析;③地震与降雨共同作用下震区次生地质灾害空间分布。在此基础上圈定了震区次生地质灾害高危和需要重点监测防范区域,为灾害救援与重建过程中次生地质灾害的防范提出了对策建议。
A strong earthquake with a magnitude of 7.0 struck the Lushan County,Ya'an City,Sichuan Province on April 20th 2013 at 8:02 AM.This seismic area is extremely prone to the secondary geological hazard due to its rugged geomorphology,adverse geological conditions caused by high seismic intensity and intensive precipitation.Important data have been collected in Lushan seismic area including topological data,geological data,tectonic data,historical geohazards,seismic intensity,rainfall data,satellite images,etc..We conducted the comprehensive hazard assessment on secondary geological hazards including:(1) Hazard assessment and spatial distribution of secondary geohazard induced by seismic force;(2) Spatial distribution and developing trend of secondary geohazard induced by precipitation;(3) Comprehensive secondary geohazard assessment in Lushan seismic area induced by earthquake superposed by precipitation.Based on the assessment result,vital influencing regions are identified that need intensive monitoring and mitigation.This work is expected to provide important suggestions for both the emergency rescue and the reconstruction of the Lushan seismic area.
A strong earthquake with a magnitude of 7.0 struck the Lushan County,Ya'an City,Sichuan Province on April 20th 2013 at 8:02 AM.This seismic area is extremely prone to the secondary geological hazard due to its rugged geomorphology,adverse geological conditions caused by high seismic intensity and intensive precipitation.Important data have been collected in Lushan seismic area including topological data,geological data,tectonic data,historical geohazards,seismic intensity,rainfall data,satellite images,etc..We conducted the comprehensive hazard assessment on secondary geological hazards including:(1) Hazard assessment and spatial distribution of secondary geohazard induced by seismic force;(2) Spatial distribution and developing trend of secondary geohazard induced by precipitation;(3) Comprehensive secondary geohazard assessment in Lushan seismic area induced by earthquake superposed by precipitation.Based on the assessment result,vital influencing regions are identified that need intensive monitoring and mitigation.This work is expected to provide important suggestions for both the emergency rescue and the reconstruction of the Lushan seismic area.
引文
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Jibson R W,Harp E L,Michael J A.2000.A method for producing digital probabilistic seismic landslide hazard maps.Engineering Geology,58(3-4):271-289.
Keefer D K.2000.Statistical analysis of an earthquake-induced landslide distribution:The 1989 Loma Prieta,California event.Engineering Geology,58(3-4):231-249.
Lan H X,Wu F Q,Zhou C H,et al.2003.Hazard Spatial Prediction of Rainfall Landslide Based on GIS.Chinese Science Bulletin,48(5):507-512.[兰恒星,伍法权,周成虎等.2003.GIS支持下的降雨性滑坡危险性空间分析预测.科学通报,48(5):507-512.]
Lan H X,Zhou C H,Wang L J,et al.2004.Landslide hazard spatial analysis and prediction using GIS in the Xiaojiang Watershed,Yunnan,China.Engineering Geology,76(1-2):109-128.
Leroi E.1996.Landslide hazard risk maps at different scales:Objectives,tools and developments.Proceeding VII Int ernatinal of the Sympsium of Landslides.Trondheim,Norway:17-21 June.
Newmark N M.1965.Effects of earthquakes on dams and embankments.Geotechnique,15(2):139.
Rodriguez-Peces M J,Perez-Garcia J L,Garcia-Mayordomo J et al.2011.Applicability of newmark method at regional,sub-regional and site scales:Seismically induced Bullas and La Paca rock-slide cases(Murcia,SE Spain).Natural Hazards,59(2):1109-1124.
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