A Quick Review on Wenchuan Earthquake

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A 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

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Contents

1. Strong Ground Motion
2. Earthquake Damage
3. Loss Amount

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1. Strong Ground Motion
Time142801, May 12, 2008 LocationWenchuan,
Sichuan Provincne Magnitude8.0 (Ms) Depth14km
(depth) Death89,000 Injury370,000 Loss700
billion RMB
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?????(???18KM)???
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??????(???87.5??,???0.69??)
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????????????????(???)
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???????(???259km)
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PGA (NS) Distribution
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PGA (EW) Distribution
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PGA (Vertical) Distribution
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Ground motion Summary

• Large permanent displacement
• Elliptical attenuation
• Long duration

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2. Earthquake Damage
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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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• Land Slide

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• Road and Bridge

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Damage of a high-pass bridge in Mianzhu City
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• Power supply and Telecommunication

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• Water supply

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Complete Collapse of Hongbai Town in Shifang City
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Complete loss of a mountain village in Xiaoba of
Anxian County
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Soft 1st story with rotation of 3.4m for the
building
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Landslides near Beichuan County
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Damage from rolling stones at the new site for
Beichuan Middle School
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Rolling stones in Gaochuan, Anxian County
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Damage of a rail track between Hongbai and
Yinghua in Shifang City
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3 steps due to uneven settlement?
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Damaged bridge near Beichuan County
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Side view of the damaged bridge near Beichuan
County
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The damaged bridge near Hongbai of Shifang City
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Liquefaction in Pixian
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Damage to 4 motors of a crane on top of Zipingpu
Dam
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Damage near expansion joints of Zipingpu Dam
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A building with minor damage in Hongbai, Shifang
City
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Minor damage to an office building for Beichuan
Tea Manufacturer
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Summary 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

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3. Loss Amount
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USGS ShapeMap Instrumental Intensity
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Casualty estimate (May 13)18,00033,000 Actual
68,000 (May 31, 2008)
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?????(???)
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Relief and Reconstruction fund

• Central Government70B
• Local Government21-35B(3050)
• Donations40B (May 31, 2008 )
• Insurance ??
• Total130 B

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Observations

• 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

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Published report on the earthquake