Lecture 4 (September 9)

Lecture 4 - o Cost to China $86 billion(US • Its tectonic setting and why it was such a surprise to geologists and seismologists o The Wenchuan

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Greg Davis Wenchuan earthquake of May 12, 2008 o It occurred near the eastern base of the Longmen Shan, one of the highest, steepest mountain fronts on the planet and part of the eastern margin of the Tibetan Plateau o Epicentral Yingxiu Only 2300 of the town’s 10,000 inhabitants survived 90,000 deaths and over 1 million homeless The facts: the earthquake itself and its cost in lives and property o 2:28 pm o Wenchuan County o M 7.9 (USGS)l M 8.0 (CEA) o Depth: shallow, ca. 10 km (6.2 miles; CEA) o Fault type: NE-striking oblique reverse fault with a right lateral (dextral) strike-slip component o Aftershocks migrated NE’d; 21,568 as of 8/2/08 30 M = 5.0-5.9 & 7 Ms = 6.0-6.9 o Max vertical slip was ca 12 m, 60 km from epicenter o Deaths: 69,197 o Missing: 18,238 o Injured: 374,176 o Homeless: > 4,800,000 o Infrastructure: 33,370 km of damaged roads, bridges, tunnels, etc.
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Unformatted text preview: o Cost to China: $86 billion (US) • Its tectonic setting and why it was such a surprise to geologists and seismologists o The Wenchuan earthquake is all about India and Tibet o Because “space geodetic studies” (GPS studies) focus on horizontal strain vectors, NOT on vertical components of strain. The rigid, strong, and topographically low crust of the Sichuan basis resists the eastward lateral escape of the weak lower crust of Tibet and forces it to flow southeastwards and northeastwards • Sichuan’s schools (disatsters waiting to happen and they did) o Pancake collapses (walls pop out, building drops out) • The largely overlooked story of landsliding o Area was susceptible • The death of Beichuan County by earthquake, landslides and flooding o...
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This note was uploaded on 01/27/2009 for the course GEOL 240Lxg taught by Professor 12:30-01:50pm during the Fall '07 term at USC.

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