Presentation Transcript
A review of hazards from the 2008 Wenchuan (Sichuan) earthquake :A review of hazards from the 2008 Wenchuan (Sichuan) earthquake David Petley http:daveslandslideblog.blogspot.com
Slide 3:Tibetan plateau Pengguan fault Chengdu
basin Yingxiu-Beichuan Fault
Slide 4:Maoxian Beichuan Songpan Mianyang Deyang Jiangyou Doujiangyan Pingwu Qingchuan Lixian Mianzhu Pengzhou Wenchuan Yingxiu 14:28 12/05/2008
Mw = 7.9
D= 19 km
The Yingxiu-Beichuan fault :The Yingxiu-Beichuan fault
The Pengguan fault :The Pengguan fault
Slide 12:Baihua bridge Destroyed
Infrastructure
Slide 13:Landslides: Before and After Landsat 5
18/09/2007 SPOT5
13/10/2008
26 landslides of >10 million m3 :26 landslides of >10 million m3
Case study – Beichuan Town :Case study – Beichuan Town Case study: Beichuan town
Slide 18:700 people killed Beichuan Middle School landslide Location of school
Slide 20:1600 people killed Wangjiayan Landslide (10 mins after
Main shock)
Wangjiayan (Beichuan old town) landslide :Wangjiayan (Beichuan old town) landslide
Debris pushed ahead of the slide :Debris pushed ahead of the slide
Not the biggest though… :Not the biggest though…
An even bigger one! Wenjiagou :An even bigger one! Wenjiagou
The biggest of them all - Daguangbao :The biggest of them all - Daguangbao
Slide 27:Daguangbao landslide
742 million m3
Slide 28:Daguangbao
(3047m) 平梁子(2208m) 风波岩(2027m) 白果林(1690m) 大偏桥(1230m) 小光包(2850m) 门 槛 石 沟 ② ③ 红 洞 子 沟
Landslides caused other problems tooTangjiashan :Landslides caused other problems tooTangjiashan
Water splash :Water splash Erosion from splash Probable second phase
Slide 31:Landslide dam Scarp 800m 620m Landslide stats:-
Length: 800 m
Width: 620 m
Volume: 3.5 million m3 Lake
Flood wave passing the ruins of Beichuan town :Flood wave passing the ruins of Beichuan town Flood wave passing Mianyang city
Beichuan: multiple debris flows :Beichuan: multiple debris flows
Debris flows remain a major problem :Debris flows remain a major problem
Day to day life :Day to day life
Reconstruction :Reconstruction
New school buildings :New school buildings
Conclusions :Conclusions