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Disruption index, DI: an approach for assessing seismic risk in urban systems (theoretical aspects)

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Abstract

Urban systems are characterized by very complex interactions. After an earthquake, a wide variety of services, networks and urban facilities may be unavailable to the public during the system failure and recovery processes, thereby causing disruptions in the basic social needs of the affected area. After a disaster, communities face several challenges. For example, the lack of education may impose population migrations, or malfunctions in the electricity distribution system can produce electrical power outages of varying duration with respect to time and space, which generates consequences in the water distribution system, transportation, communications, etc. A methodology called the Disruption index (DI), based on graph theory, includes these multiple interdependencies. It has been developed to estimate the dysfunction of some fundamental dimensions of urban systems on a broad level, starting with the physical damages directly suffered by the exposed assets, proceeding to the impacts that each node has on the functional performance of the nodes depending on them, until reaching the top node. This paper presents the fundamental theory to support the DI concept. The DI provides the likely impacts and consequences of an earthquake in an urban area to fulfill hazard mitigation and provide civil protection agencies and local and state governments with a new decision-making instrument to reduce or prevent severe and recurrent impacts. The DI concept can also be extended to other natural and man-made disasters and may be used as a tool for optimizing the resources of the system components.

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Notes

  1. The authors also mention dimensions like “criteria”, “objectives” or “concerns”.

  2. Field Missions include the Azores (Oliveira et al. 2012), China (Costa et al. 2010), Italy (Proença and Ferreira 2009), Haiti (Oliveira and Ferreira 2010) and Spain (Ferreira 2011).

  3. A topological order of a directed graph [G] is an ordering of its vertices as \(\hbox {v}_{1}\), \(\hbox {v}_{2}\), ..., \(\hbox {v}_\mathrm{n}\) such that, for every edge e(\(\hbox {v}_\mathrm{i}\), \(\hbox {v}_\mathrm{j})\) starting at vertex \(\hbox {v}_\mathrm{i}\) and ending at vertex \(\hbox {v}_\mathrm{j}\), we have i \(<\)j.

  4. “System 1 operates automatically and quickly, with little or no effort and no sense of voluntary control. System 2 allocates attention to the effortful mental activities that demand it, including complex computations (...)”.

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Acknowledgments

The preparation of this paper was supported in part by FCT PhD grants SFRH/BD/29980/2006 (Mónica Amaral Ferreira) and SFRH/BD/71198/2010 (Francisco Mota de Sá) and was co-financed by the EU—Civil Protection Financial Instrument in the framework of the European Project ”Urban disaster Prevention Strategies using MAcroseismic Fields and FAult Sources” (UPStrat-MAFA-Num. 230301/2011/613486/SUB/A5), DG ECHO Unit A5. Special acknowledge to Dr. Gaetano Zonno from INGV, Italy, for all his support and to Prof. Ragnar Sigbjörnsson from University of Iceland, for all support and important suggestions made. We thank Prof. Sancho Oliveira from ISCTE for revising some computational aspects.

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Correspondence to M. A. Ferreira.

Appendix: Description of levels of criteria

Appendix: Description of levels of criteria

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Ferreira, M.A., Mota de Sá, F. & Oliveira, C.S. Disruption index, DI: an approach for assessing seismic risk in urban systems (theoretical aspects). Bull Earthquake Eng 12, 1431–1458 (2014). https://doi.org/10.1007/s10518-013-9578-5

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