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.
109
Made with FlippingBook HTML5