Resilience index is used to analyze complex systems such as communities, when they are subjected to disasters like earthquakes, hurricanes, floods etc. in order to quantify preventive measures, emergency measures and restoration measures. Physical infrastructures within a community have a certain degree of interdependency. Interdependencies can generate cascading failures or amplification effects which can eventually affect also the restoration measures right after an extreme event. These effects can be described by a reduction of the resilience index within a given region. In this article, starting from the restoration curves of March 11th 2011 Tohoku Earthquake in Japan, a method to evaluate the interdependency index and to calculate the community resilience index is proposed. The weights of each infrastructure which are used to evaluate resilience are evaluated starting from the degree of interdependency indices which are evaluated using time series analysis.
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