Multi-hazard analysis of earthquake shaking and tsunami impact. (October 2018)

• Record Type: Journal Article
• Authors: Bonacho, João; Oliveira, Carlos Sousa
• Is Part Of: International journal of disaster risk reduction. Volume 31(2018)
• Page Start: 275
• Page End: 280
• Publication Date: 2018-10
• Subjects: Tsunami -- Earthquake -- Damages -- Aggregated damages -- Simulator -- GIS; Emergency management -- Periodicals; Risk management -- Periodicals; Disaster relief -- Periodicals; Hazard mitigation -- Periodicals; 363.34
• DOI: 10.1016/j.ijdrr.2018.05.023
• Languages: English
• ISSNs: 2212-4209

Abstract

Abstract: Tsunami damage on buildings in regions subjected to shaking is commonly modeled disregarding the occurrence of a previous earthquake and damages that have already occurred at those buildings. In Portugal, there are studies for the regions of Lisboa, Setúbal and Algarve that access damages or vulnerability of buildings due to the action of tsunami waves. Even so, they never took into account that, if near to the epicenter, usually prior to the tsunami, there was an earthquake shaking capable of provoking some level of damages to the building stock in the affected area. In this paper, we propose a way of combining earthquake shaking damages with tsunami damages – the aggregated damage. This is defined as an additive function. The aggregated damage of a building is the sum of damages caused by the earthquake plus those caused by the tsunami. As for earthquake shaking damage assessment, we use a home-developed software model based on standard vulnerability indexes conveying fragility curves for 5 different damage states (DSi ), for reinforced concrete and other building typologies (only masonry is considered in the present case). The tsunami fragility curves corresponding to similar DSi, were obtained from recent published literature where the main variable was the water maximum height reaching each building which was estimated using a Geographic Information System (GIS) approach.