2020 Local Hazard Mitigation Plan

City of Irvine

2020 Local Hazard Mitigation Plan

Seismic Shaking Many physical assets in the City are estimated to experience the same seismic shaking intensity, ranging from 55 to 75% g (shaking intensity in relation to earth’s gravity). Therefore, all facilities could potentially be damaged during a significant seismic event, which would likely be extremely costly for the City. If all facilities were to be damaged at the same time during a seismic shaking event, it can be assumed that the City would incur a percentage of the maximum potential loss of its physical assets. Assuming 20% of the City’s assets are impacted, this potential loss could amount to over $73 million. Underground physical assets, like pipelines or utilities, could be damaged if nearby faults were to rupture below the surface. In such a scenario, natural gas and water delivery service to Irvine homes and businesses would be out of commission until repairs are completed. Figure 4-10 identifies CFs and FOC in Irvine that are threatened by seismic shaking.

Figure 4-10: Seismic Shaking Physical Threat

Social Threat

The risk of a seismic event is a danger to all groups in Irvine though some are more threatened than others.

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