Time probabilistic evaluation of seismically induced landslide hazard in Irpinia (Southern Italy)
✍ Scribed by V. Del Gaudio; J. Wasowski
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 602 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0267-7261
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✦ Synopsis
A recently proposed method, which incorporates the Newmark model to evaluate the earthquake-induced landslide hazard at regional scale, was applied to Irpinia, one of the most seismically active regions of Italy. The method adopts a probabilistic approach to calculate values of critical acceleration a c representing the minimum strength required for a slope not to fail at a fixed probability level in a given time interval. Regional probabilistic hazard maps were generated for the two failure types most common in Irpinia (slump-earthflows and rock falls). The results suggest that quite moderate critical acceleration (0.05-0.08 g) could suffice to keep the slope failure probability low. However, the available data indicate that potential slide surfaces with a c below these values could be common in Irpinia, where, perhaps in relation to particular geo-environmental conditions, a relative large number of marginally stable slopes might survive other destabilising actions and fail even on occasion of not particularly strong earthquake shaking.