Quantification of Lifeline System Interdependencies after the 27 February 2010 Mw 8.8 Offshore Maule, Chile, Earthquake

摘要

Data on lifeline system service restoration is seldom exploited for the calibrationof performance prediction models or for response comparisons across systemsand events. This study explores utility restoration curves after the 2010 Chileanearthquake through a time series method to quantify coupling strengths acrosslifeline systems. When consistent with field information, cross-correlationsfrom restoration curves without significant lag times quantify operational interdependence,whereas those with significant lags reveal logistical interdependence.Synthesized coupling strengths are also proposed to incorporate cross-correlationsand lag times at once. In the Chilean earthquake, coupling across fixed and mobilephones was the strongest per region followed by coupling within and across telecommunicationand power systems in adjacent regions. Unapparent couplingswere also revealed among telecommunication and power systems with water networks.The proposed methodology can steer new protocols for post-disaster datacollection, including anecdotal information to evaluate causality, and inform infrastructureinterdependence effect prediction models.