State of California’s Third Generation Tsunami Hazard Maps for Emergency Response Planning
Description:
The California Tsunami Program (CTP) has completed it’s third-generation, statewide update to the Tsunami Hazard Area maps for emergency response planning (tsunami.ca.gov). The California Geological Survey (CGS), the California Governor’s Office of Emergency Services, and the NOAA National Weather Service led the statewide update with support from coastal county emergency managers. Updated Tsunami Hazard Area maps and data are used by local decision-makers as a basis to inform decisions regarding evacuation planning.
Advancements in tsunami modeling, source characterization, and digital elevation models have been made since publication of the State of California’s second-generation 2009 tsunami hazard maps. Previous deterministic models for local and distant tsunami sources were generated using a 30- to 90-m resolution grid. New tsunami inundation models follow a probabilistic tsunami hazard analysis (PTHA) approach, generated using a 10-meter resolution grid. This PTHA uses sources that represent events equivalent to the 975-year average return period (ARP). Tsunami Hazard Area maps incorporate an approach that defines a maximum hazard area. We define the landward extent of inundation that includes both PTHA results (enhanced using lidar elevation data) and the 2009 deterministic local- and distant-source models. Local stakeholders, emergency managers, first responders, and tsunami hazard subject matter experts are consulted about the placement of the final hazard area boundary. With this consultation, we consider the organization of the evacuation from an emergency management perspective as well as the ease of evacuation from the public’s perspective. Following the map and data release, the CTP continues to support local agencies use of the updated Tsunami Hazard Area maps with their tsunami preparedness, mitigation, and response activities.
Session: The Future of Tsunami Science, Preparedness and Response [Poster]
Type: Poster
Date: 4/19/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Nicholas A. Graehl
Student Presenter: No
Invited Presentation:
Authors
Nicholas Graehl Presenting Author Corresponding Author nicholas.graehl@conservation.ca.gov California Geological Survey |
Jacqueline Bott jacqueline.bott@conservation.ca.gov California Geological Survey |
Jason Patton jason.patton@conservation.ca.gov California Geological Survey |
Rick Wilson rick.wilson@conservation.ca.gov California Geological Survey |
Yvette LaDuke yvette.laduke@caloes.ca.gov California Governor’s Office of Emergency Services |
Matthew Palmer matthew.palmer@caloes.ca.gov California Governor’s Office of Emergency Services |
Todd Becker todd.becker@caloes.ca.gov California Governor’s Office of Emergency Services |
Ryan Aylward ryan.aylward@noaa.gov National Oceanic and Atmospheric Administration, National Weather Service |
Brian Garcia brian.garcia@noaa.gov National Oceanic and Atmospheric Administration, National Weather Service |
Eric Boldt eric.boldt@noaa.gov National Oceanic and Atmospheric Administration, National Weather Service, Los Angeles, California, United States |
Alex Tardy alexander.tardy@noaa.gov National Oceanic and Atmospheric Administration, National Weather Service, San Diego, California, United States |
State of California’s Third Generation Tsunami Hazard Maps for Emergency Response Planning
Category
The Future of Tsunami Science, Preparedness and Response