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