Title: A Quick Review on Wenchuan Earthquake
1A Quick Review on Wenchuan Earthquake
- Zifa Wang, Baitao Sun
- Junwu Dai and Shanyou Li
- Institute of Engineering Mechanics,
- China Earthquake Administration
- Chengdu, China, August 04, 2008
2Contents
- Strong Ground Motion
- Earthquake Damage
- Loss Amount
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41. Strong Ground Motion
Time142801, May 12, 2008 LocationWenchuan,
Sichuan Provincne Magnitude8.0 (Ms) Depth14km
(depth) Death89,000 Injury370,000 Loss700
billion RMB
5?????(???18KM)???
6??????(???87.5??,???0.69??)
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10???????(???259km)
11PGA (NS) Distribution
12PGA (EW) Distribution
13PGA (Vertical) Distribution
14 Ground motion Summary
- Large permanent displacement
- Elliptical attenuation
- Long duration
15 2. Earthquake Damage
16 IEMs Efforts
- 1st expert team dispatched within 2 hours
- 7 expert teams dispatched, 75 staff
- Currently, 20 staff on the field
- Fields of work
- Search and rescue
- Field survey
- Loss estimation
- Engineering safety evaluation
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42Damage of a high-pass bridge in Mianzhu City
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51- Power supply and Telecommunication
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70Complete Collapse of Hongbai Town in Shifang City
71Complete loss of a mountain village in Xiaoba of
Anxian County
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74Soft 1st story with rotation of 3.4m for the
building
75Landslides near Beichuan County
76Damage from rolling stones at the new site for
Beichuan Middle School
77Rolling stones in Gaochuan, Anxian County
78Damage of a rail track between Hongbai and
Yinghua in Shifang City
793 steps due to uneven settlement?
80Damaged bridge near Beichuan County
81Side view of the damaged bridge near Beichuan
County
82The damaged bridge near Hongbai of Shifang City
83Liquefaction in Pixian
84Damage to 4 motors of a crane on top of Zipingpu
Dam
85Damage near expansion joints of Zipingpu Dam
86A building with minor damage in Hongbai, Shifang
City
87Minor damage to an office building for Beichuan
Tea Manufacturer
88Summary on Damage
- Weakest link Buildings in the countryside,
schools and without proper seismic design - Effect of seismic design
- Profound effect of lifeline systems
- Wide spread geotechnical damage
89 3. Loss Amount
90USGS ShapeMap Instrumental Intensity
91Casualty estimate (May 13)18,00033,000 Actual
68,000 (May 31, 2008)
92??????
93??????
?????(???)
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95Relief and Reconstruction fund
- Central Government70B
- Local Government21-35B(3050)
- Donations40B (May 31, 2008 )
- Insurance ??
- Total130 B
96Observations
- We know little about earthquakes
- Occurrence, ground motion, and damage
- Weakest link
- rural areas, schools and old buildings
- Huge impact of lifeline systems
- Heavy damage due to geotechnical failure
- National efforts on search and rescue
- Risk diversification (catastrophe insurance)
- Simple and effective measures for rural areas
97Published report on the earthquake