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Abstract
This study develops a comprehensive seismic risk model for the city of Chania, in Greece, which is located ina highly seismic-prone region due to the occurrenceof moderate to large earthquakes because of the nearby major subduction zone between African and Eurasian tectonic plates. The main aim is to reduce the seismic risk for the study area by incorporating the spatial distribution of the near-surface shear wave velocity model and the soil classification, along with all possible seismic sources, taking into account historical events. The study incorporates and correlates various ground motion scenarios and geological fault zones as well as information on existing buildings to develop a seismic risk model using QuakeIST software, and then the seismic hazard and a realistic prediction of resulting future adverse effects are assessed. The developed model can assist the municipal authorities of Chania to be prepared for potential seismic events, as well as city planners and decisionmakers, who can use the model as an effective decision-making tool to identify the seismic vulnerability of the city buildings and infrastructure. Thus, this study enables the implementation of an appropriate and viable earthquake-related hazards strategy to mitigate damage and losses in future earthquakes.
Highlights
Geographical Information Systems(GIS) consist of a powerfuland general-purpose computational tool with many applications in complex and multidisciplinary topics.In recent years, there has beensignificant progressin GIS-based seismic hazard and risk models [1,2,3]
Characteristic results of the application of QuakeIST for the seismicrisk assessment of Chania are provided, based on the Kythira earthquake local seismic modelreported by Koutsoupakis [51].The seismological data were taken from the relevant study of Koutsoupakis et al [52]
The maps with average damage rates presented in the sequence are the outcome of the fragility analysisusing the available models of QuakeIST taking into account the spatial distribution and vulnerability of existing buildings as well as the local site conditions that affect soil dynamic response
Summary
Geographical Information Systems(GIS) consist of a powerfuland general-purpose computational tool with many applications in complex and multidisciplinary topics.In recent years, there has beensignificant progressin GIS-based seismic hazard and risk models [1,2,3]. Used GIS-based computational platforms, including HAZUS [14,15] and RADIUS [16,17], perform seismic risk assessment through expert judgment and/or local observations and measurements Such approaches cannot be implemented in areas where necessary background information is incomplete. The island is located on the edge of active plate boundaries, where numerous damaging earthquakes have occurred since ancient times This investigation aims to integrate seismic sources, seismotectonic deformation, ground motion attenuation, and local site conditions to accurately assess earthquake hazard, which is combined with structures and their vulnerability to derive a realistic seismic risk assessment at an urban scale. This study attempts to formulate a practice-oriented methodology that authorities could use as an effective decision-making tool in order to implement appropriate techno-economic planning and seismic protection measures to minimize potential damage and losses (primarily human, but financial as well) in future earthquakes
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