Spatial Analysis of Landslides Triggered by the 2013 MS7.0 Lushan Earthquake: A Case Study of a Typical Rectangle Area in the Northeast of Taiping Town
详细信息
- 责任者：Xu Chong (Key Laboratory of Active Tectonics and Volcano ; Institute of Geology ; China Earthquake Administration ; Beijing 100029 ; China) ; Xiao Jianzhang
- 刊名：Seismology and Geology
- 出版年：2013
- 卷期：35(2)
- 关键词：震灾 ; seismic hazard ; 滑坡 ; landslides ; 四川 ; Sichuan Province
- 页码：p.436-451
- 图表：illus., 2 tables, 40 refs.
- 分类号：1800
- issnNo：ISSN0253-4967
- isbnNo：CN11-2192/P
摘要
In this paper,a rectangle area of 20km × 10km at the northeast of Taiping Town,which suffered strong shaking during the April 20,2013 MS 7. 0 Lushan earthquake,was selected as the study area for spatial analyses of landslides triggered by the earthquake. Landslide distribution map of the study area was prepared based on quick field investigations and visual interpretation of high-resolutions aerial photographs. It is showed that at least 688 landslides were triggered by the Lushan earthquake and the landslide number density( LND) of the study area is 3. 44 landslides /km2 . Correlations of landslide number density with topographic,geologic and seismic parameters were analyzed based on the landslide inventory. The results show that the steeper the slopes,the greater the landslide number density values; the highest LND value appears at ranges from 1 600m to 1 800m in elevation. The landslides have preferred orientations,dominated by the east and SE directions. LND values of convex slopes are relatively higher. The limestone and dolomite of the Yangxin Group,Permian ( Py) and granitic rocks of Proterozoic( Pt) experienced more concentrated landslides. In general,the higher the PGA value and seismic intensity zone,the greater the LND value. Correlation of landslide number density with distance from the Shuangshi-Dachuan Fault shows that there was not sudden change of LND value near the fault. The factor interaction statistics show that the slope angle and PGA affect the occurrence of earthquake-triggered landslides independently.
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