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Natural hazards risk associated with petroleum storage in the Wellington Region, New Zealand

Brabhaharan,P., Bharathy,G. K., Lynch,R., Prentice,D.

Proceedings of 2003 Pacific Conference on Earthquake Engineering

2003

Wellington Regional Council has a strategy to identify, assess and manage the risks from natural and technological hazards. As part of this strategy a study was carried out to assess the risks associated with petroleum storage from natural hazards. The predominant hazard posing a risk to petroleum storage facilities in the Wellington Region is earthquakes. The assessment included bulk petroleum storage facilities, storage at service stations as well as pipelines.

This case study illustrates the assessment of the risk associated with spill and fire / explosion events at petroleum storage facilities, due to natural hazards, using techniques such as event and fault tree analyses. The vulnerability of the tanks was assessed based on their age, condition, design characteristics and the earthquake hazards. The earthquake hazards included ground shaking, liquefaction and slope failures, and other natural hazards comprised wild fire, flooding and storm induced landslides.

The effect of petroleum spills or fire / explosion were assessed considering the people, built and natural environments. The risks to these environments were assessed as a combination of the hazard and the vulnerability of these environments to the consequences. The spat ial risk was derived using a geographical information system.

Risk management measures were identified to manage the risks from the hazards associated with petroleum storage.

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