VULNERABILITY DATA COLLECTION AND DEFINITION OF SEISMIC RISK FOR CITIES IN PALESTINE

Abstract eng:
This paper investigates the web with GIS functionality (WebGIS) realized by Eucentre (EUropean CENtre for Training and Research in Earthquake engineering) for SASPARM 2.0 (Support Action for Strengthening PAlestine capabilities for seismic Risk Mitigation) project [1]. The end users of the WebGIS are citizens, students, practitioners, governmental and non-governmental institutions. The platform represents a very useful and intuitive tool to load and manage data collected during the survey of residential buildings. Both practitioners and citizens can collect structural data for residential buildings by using two forms, different from each other only in terms of detail. The forms are organized into sections and they allow to identify the main geometrical and structural features of the surveyed buildings. The forms can be compiled directly on WebGIS or through two apps specifically created for Android operating system 4.0 and following. The apps enable the compilation of the fields also when internet connection is not available: data are stored on smartphone or tablet and then sent to the Web portal once internet connection is available. Starting from collected data, the seismic risk of each building is evaluated. In particular, the seismic demand to which each building is subjected to is defined from the hazard curve. In the specific case study of Nablus, the hazard curve is obtained by referring to the "West Bank and Gaza Strip: Seismic Hazard Distribution Map". For what concern the structural vulnerability, it is quantified through fragility curves. Fragility curves are defined for five damage levels [2] by using the mechanical method SP-BELA (Simplified Pushover-Based Earthquake Loss Assessment) modified in order to represent the building environment in Nablus. By combining the hazard and the vulnerability of each building, it is possible to calculate the seismic risk.

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