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Landslide hazards triggered by the 2008 Wenchuan earthquake, Sichuan, China Yueping Yin . Fawu Wang . Ping Sun Landslides (2009) 6:139–151. 指導老師 : 董家鈞 老師 學生 : 李玟璇 報告日期 :2011/01/06. Introduction. Wenchuan earthquake-2008.5.12. - PowerPoint PPT Presentation
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Landslide hazards triggered by the 2008 Wenchuan earthquake, Sichuan, China Yueping Yin . Fawu Wang . Ping Sun Landslides (2009) 6:139151
Landslide hazards triggered by the 2008 Wenchuanearthquake, Sichuan, China
Yueping Yin . Fawu Wang . Ping Sun
Landslides (2009) 6:139151
: ::2011/01/06Introduction2Wenchuan earthquake-2008.5.12.the distribution of the landslides; analyze the properties of landslides and landslide lakes
116P.102
Distribution of landslides triggered by the earthquake3Geohazards have frequently occurred in the zone along the Longmenshan active fault system.landslidesrockfallsdebris flowsunstable slopestotalBefore35726007375215430After1701184430410934970Table 1 Potential geohazards in the counties that experienced extremely severe effects caused by earthquake4
Fig. 1 Comparative histograms of geohazards in the counties affected by theWenchuan earthquake before and after the earthquake5
11692782617% 123% 152% Total 237% 480% Fig. 2 Map of earthquake-triggered landslides in Beichuan6
132Beichuan7
123http://www.iseis.cuhk.edu.hk/gb/special/sichuan_rs.htmFig. 4 Cross section of the Xinbei Middle School landslide in Beichuan8
length 560mwidth 200maverage thickness 20m8Fig. 6 Cross section of the Tangjiashan landslide9
landslide-length 610mwidth 800mlandslide dam height 80-120mDistribution of landslides triggered by the earthquake10Besides these large volume landslides and rockfalls, many small-scale landslides and rockfalls occurred along the road and caused severe damage.(ex. national highway from Chengdu City to Jiuzhaigou Resort)
http://www.iseis.cuhk.edu.hk/gb/special/sichuan_rs.htmFig. 5 Distribution of landslide-dammed lakes11
Landslide-dammed lakes and their risk assessment12three factors:(1)Landslide dam height.(2)The capacity of the landslide-dammed lake. (3)The structure of the dam material.
RiskFactorExtremely high riskHigh riskMedium riskLow riskLandslide dam height (m)>100501002550