Seismic Loss Assessments

The purpose of a Seismic Loss Assessment is to determine the maximum seismic loss for a property based on Probable Maximum Loss (PML) statistical calculations. The reports are based upon statistical and historical data of how a property will be affected by a probable major seismic event with a 500-year return period.

The scope of work for a Seismic Loss Assessment consists of the following:

• Review of Uniform Building Codes (UBC)
• Visual Inspection
• Review of the Local Geology, Soils, including landslide and liquefaction potential
• Review of Regional Fault Zone Maps
• Review of Seismic Hazard Maps
• Review of “Alquist-Priolo Earthquake Fault Zoning Act”
• Determination of Probable Maximum Loss for the subject property
• Contact with Regulatory Agencies

In addition, AquaTerra utilizes the ST-RISK software model to estimate the building’s Probable Maximum Loss (PML). This method combines the loss methodology originally developed by Karl Steinbrugge in his 1982 book Earthquakes, Volcanoes and Tsunamis, with the structural evaluation procedures developed in the document FEMA-178: NEHRP Procedure for the Seismic Evaluation of Existing Structures. The PML estimates are calculated based on the expected performance of the building considering the buildings unique structural characteristics. Predicted ground shaking intensities follow the same methodology that the California Division of Mines and Geology and the United States Geological Survey used to produce their seismic hazard maps.