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Urban seismic risk index for Medellín, Colombia, based on probabilistic loss and casualties estimations

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Abstract

Medellín is the second largest city of Colombia with more than 2 million inhabitants according to the latest census and with more than 240,000 public and private buildings. It is located on an intermediate seismic hazard area according to the seismic zonation of Colombia although no destructive earthquakes have occurred having as a consequence low seismic risk awareness among its inhabitants. Using the results of a fully probabilistic risk assessment of the city with a building by building resolution level and considering the dynamic soil response, average annual losses by sectors as well as casualties and other direct effects are obtained and aggregated at county level. Using the holistic evaluation module of the multi-hazard risk assessment CAPRA platform, EvHo, a comprehensive assessment that considered the social fragility and lack or resilience at county level is performed making use of a set of indicators with the objective of capturing the aggravating conditions of the initial physical impact. The urban seismic risk index, USRi, is obtained at county level which is useful to communicate risk to decision-makers and stakeholders besides making easy identifying potential zones that can be problematic in terms of several dimensions of the vulnerability. This case study is an example of how a multidisciplinary research on disaster risk reduction helps to show how risk analysis can be of high relevance for decision-making processes in disaster risk management.

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Notes

  1. Comprehensive approach to probabilistic risk assessment (www.ecapra.org).

  2. An exchange rate of 1USD = 3,000COP has been used in this study.

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Acknowledgments

The authors are grateful for the support of the Ministry of Education and Science of Spain “Enfoque integral y probabilista para la evaluación del riesgo sísmico en España”—CoPASRE (CGL2011-29063). Also to the Spain’s Ministry of Economy and Competitiveness in the framework of the researcher’s formation program (FPI) and the support of the “Paul C. Bell, Jr.” risk management program of the Florida International University (FIU). This work has also been partially sponsored by the European Commission (project DESURBS-FP7-2011-261652). Finally the authors would like to thank an anonymous reviewer whose comments helped to improve the original version of the manuscript.

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Authors and Affiliations

  1. Centre Internacional de Metodes Numerics en Enginyeria (CIMNE), Universitat Politecnica de Catalunya, Edifici C-1, Despatx C-111 Carrer Gran Capità, S/N, Campus Nord UPC, 08034, Barcelona, Spain

    Mario A. Salgado-Gálvez, César A. Velásquez, Martha L. Carreño & Alex H. Barbat

  2. Illinois Institute of Technology, Chicago, IL, USA

    Daniela Zuloaga Romero

  3. Instituto de Estudios Ambientales (IDEA), Universidad Nacional de Colombia Sede Manizales, Manizales, Colombia

    Omar-Darío Cardona

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  1. Mario A. Salgado-Gálvez
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  2. Daniela Zuloaga Romero
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  3. César A. Velásquez
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  4. Martha L. Carreño
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Correspondence to Mario A. Salgado-Gálvez.

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Salgado-Gálvez, M.A., Zuloaga Romero, D., Velásquez, C.A. et al. Urban seismic risk index for Medellín, Colombia, based on probabilistic loss and casualties estimations. Nat Hazards 80, 1995–2021 (2016). https://doi.org/10.1007/s11069-015-2056-4

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