NH040-10
California Statewide Hazus Tsunami Model Risk Assessment for 20 Coastal Counties

Wednesday, 16 December 2020: 16:32
Virtual
Todd Becker, California Office of Emergency Services, Eureka, United States, Nicholas A. Graehl, California Geological Survey Sacramento, Seismic Hazards, Tsunami, Sacramento, CA, United States, Kevin Miller, California Office of Emergency Services, Governor's Office, Pasadena, CA, United States, Rick I Wilson, California Geological Survey, Sacramento, CA, United States, Yvette LaDuke, California Governor's Office of Emergency Services, Valencia, CA, United States, Jason R Patton, California Geological Survey Sacramento, Sacramento, CA, United States, Jacqueline D Bott, California Geological Survey, Seismic Hazards, San Mateo, CA, United States and Dominique Degrate-Word, California Office of Emergency Services, Pasadena, CA, United States
Recorded Presentation
Abstract:
California is conducting a comprehensive, statewide tsunami risk assessment in the 20 coastal counties susceptible to tsunami hazard. The California Tsunami Program (CTP), a partnership between the California Governor’s Office of Emergency Services (Cal OES) and California Geological Survey (CGS), leads the State’s efforts to reduce risk associated with tsunami.

We applied FEMA’s Hazus Tsunami Model to assess the potential economic and societal losses associated with tsunami. We used new, probabilistic tsunami modeling inundation extents, similar to those used for community evacuation planning, as hazard data inputs into the Hazus Tsunami Model. Working with FEMA, the State obtained enhancements for the statewide database used with Hazus that included the National Structure Inventory 2.0 (NSI2.0). The NSI2.0 database uses building footprint data to enhance building feature location and attribute values providing us an improved database with comprehensive and consistent coverage for the statewide risk analysis.

Effective statewide tsunami risk assessment efforts must include collaboration with coastal emergency managers and other community-based decision makers to develop customized reports with specific loss estimate representations at appropriate scales. The CTP receives feedback from coastal emergency managers and decision makers to develop risk assessment products that inform local preparedness, mitigation, and response planning activities.

The CTP and its partners are collaborating with FEMA’s Hazus Tsunami Model team to integrate new modeling and damage assessment tools because the model does not currently include modeling, damage, or benefit-cost analysis (BCA) information for port and harbor facilities, community infrastructure (roads, bridges, utilities, etc.), or sediment/debris damage and accumulation. The development of tsunami maritime, infrastructure, and debris damage models will help bridge these gaps in damage information and provide a better overall picture of loss estimates for a community.

The CTP will continue to refine the statewide risk assessments over the next few years to develop locally-driven guidance for coastal California communities that will inform decision-making and lead to improvements in tsunami hazard resiliency.

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