Characteristics of Engineering Damage and Human Mortality in Mianzhu Areas in the Great 2008 Wenchuan, Sichuan, Earthquake

Abstract eng:
The great Ms 8.0 Wenchuan earthquake caused huge seismic damage and high casualty in the areas along the Longmenshan fault zone. Mianzhu is a city among those severe damaged areas. Mianzhu city is located near the central Longmenshan fault and crossed by the front range fault, Dujiangyan-anxian fault. After the earthquake occurred, a field team of IEM reached Mianzhu city at the earliest time, and the field survey were carried out. Investigations into the engineering damage and human mortality in Mianzhu show that the seismic intensity attenuates fast with the distance to the fault trace, and it dramatically decreases from X to about VII degree within a distance of about 60 km; Whereas, seismic intensity along the fault trace shows almost no attenuation within the distance of about 20 km in Mianzhu. Except for the effect of site condition, topography and path, this phenomenon may also effected by the rupture direction of the long extended Longmenshan fault and it’s front range fault.

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