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Entity_and_Attribute_Overview:
Digital GIS files are provided as ESRI shapefiles. These GIS data are current as of 2022. Please check the CGS Tsunami Website at https://www.tsunami.ca.gov/ for current information on new and revised tsunami maps and data.
Microsoft Windows 10 Version 10.0 (Build 19045) ; Esri ArcGIS 13.0.4.36057
Tsunami Inundation Buffer 0_25 mi
2022-10-07T00:00:00
Tsunami Hazard Area, 2020-2022
Tsunami Hazard Area, 2020-2022
Suggested_Citation:
State of California, 2022. Tsunami Hazard Area, {countyname} County; produced by the California Geological Survey and the California Governor’s Office of Emergency Services; dated 2022
external
209b2d3e6be4769c285742155e5ae1b2
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
California Geological Survey, Seismic Hazards Program, Tsunami Hazards Unit
Project Manager
715 P Street, MS 1901
Sacramento
California
95814-3532
SHMP@conservation.ca.gov
(916) 322-1019
(916) 445-3334
True
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
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Tsunami Hazard Area
Tsunami Hazard Map
Tsunami Hazard Identification and Mitigation
Tsunami
Hazard
Evacuation
boundaries
oceans
planningCadastre
California
USA
Humboldt County
Del Norte County
Mendocino County
Alameda County
Contra Costa County
Del Norte County
Los Angeles County
Monterey County
Orange County
San Francisco County
San Luis Obispo County
San Mateo County
Santa Barbara County
Santa Clara County
Marin County
Napa County
San Diego County
Santa Cruz County
Solano County
Sonoma County
Ventura County
Purpose: This Tsunami Hazard Area is prepared to assist cities and counties in identifying their exposure to tsunami hazards. It is intended for local jurisdictional, coastal evacuation planning uses only. This map and these data, and the information presented herein, are not legal documents and do not meet disclosure requirements for real estate transactions nor for any other land-use or regulatory purpose. The hazard map is compiled with best currently available scientific information. The Tsunami Hazard Area represents an area that could be exposed to tsunami hazards during a tsunami event. The Tsunami Hazard Area includes tsunami model results that at a minimum represent inundation exceeding that of a 975-year average return period event. Please refer to the following websites for additional information on the construction and/or intended use of the Tsunami Hazard Area:
California Geological Survey Tsunami Information: https://www.tsunami.ca.gov/
California Governor’s Office of Emergency Services, Earthquake, Tsunami, and Volcano Program: https://www.caloes.ca.gov/office-of-the-director/operations/planning-preparedness-prevention/seismic-hazards/
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Abstract: Produced collectively by tsunami modelers, geologic hazard mapping scientists, and emergency planning specialists from the California Geological Survey, the California Governor’s Office of Emergency Services, the Tsunami Research Center at the University of Southern California, and AECOM Technical Services. The Tsunami Hazard areas are developed for all populated areas at risk to tsunamis in California and represent a combination of the maximum considered tsunamis for each area. Local agencies, organizations, and other stakeholders assisted the State in the development of the hazard area as they will be used for evacuation planning at the community level.</SPAN></P></DIV></DIV></DIV>
Tsunami Hazard Area
Tsunami Hazard Map
Tsunami Hazard Identification and Mitigation
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Evacuation
California
USA
Alameda
Contra Costa
Del Norte
Humboldt
Los Angeles
Mendocino
Monterey
Orange
San Francisco
San Luis Obispo
San Mateo
Santa Barbara
Santa Clara
Marin
Napa
San Diego
Santa Cruz
Solano
Sonoma
Ventura
external
209b2d3e6be4769c285742155e5ae1b2
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
California Geological Survey, Seismic Hazards Program, Tsunami Hazards Unit
Project Manager
715 P Street, MS 1901
Sacramento
California
95814-3532
SHMP@conservation.ca.gov
(916) 322-1019
(916) 445-3334
True
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
external
209b2d3e6be4769c285742155e5ae1b2
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
California Geological Survey, Seismic Hazards Program, Tsunami Hazards Unit
Project Manager
715 P Street, MS 1901
Sacramento
California
95814-3532
SHMP@conservation.ca.gov
(916) 322-1019
(916) 445-3334
True
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN /></P><P><SPAN>Access_Constraints: Because digital data are easily altered those who use this file, or these data are advised to obtain the file directly from the California Geological Survey.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>, <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Use_Constraints: LICENSE AGREEMENT: © 2022 California Geological Survey. All rights reserved. No part of these data may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical for any purpose, without the express written permission of the California Geological Survey except under the following conditions: 1) for personal use; 2) for publication in a report, in unmodified form, cite on figure or in text as "Reproduced with permission, California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022);" and (3) for publication in a report in modified form; cite on figure or in text as "Modified from California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022)."</SPAN></P><P><SPAN /></P><P><SPAN>These maps and data are prepared to assist cities and counties in identifying their tsunami hazard and are intended for local jurisdictional, coastal evacuation planning uses only. These maps and data are not legal documents and do not meet disclosure requirements for real estate transactions nor for any other regulatory purpose. The California Geological Survey, California Governor's Office of Emergency Services, the University of Southern California, and AECOM Technical Services make no representation or warranties regarding the accuracy of these data. Neither the State of California, the University of Southern California, nor AECOM Technical Services shall be liable under any circumstances for any direct, indirect, special, incidental, or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map or these data.</SPAN></P><P><SPAN /></P></DIV></DIV>
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN /></P><P><SPAN>Access_Constraints: Because digital data are easily altered those who use this file, or these data are advised to obtain the file directly from the California Geological Survey.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>, <DIV STYLE="text-align:Left;"><DIV><P><SPAN>Use_Constraints: LICENSE AGREEMENT: © 2022 California Geological Survey. All rights reserved. No part of these data may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical for any purpose, without the express written permission of the California Geological Survey except under the following conditions: 1) for personal use; 2) for publication in a report, in unmodified form, cite on figure or in text as "Reproduced with permission, California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022);" and (3) for publication in a report in modified form; cite on figure or in text as "Modified from California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022)."</SPAN></P><P><SPAN /></P><P><SPAN>These maps and data are prepared to assist cities and counties in identifying their tsunami hazard and are intended for local jurisdictional, coastal evacuation planning uses only. These maps and data are not legal documents and do not meet disclosure requirements for real estate transactions nor for any other regulatory purpose. The California Geological Survey, California Governor's Office of Emergency Services, the University of Southern California, and AECOM Technical Services make no representation or warranties regarding the accuracy of these data. Neither the State of California, the University of Southern California, nor AECOM Technical Services shall be liable under any circumstances for any direct, indirect, special, incidental, or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map or these data.</SPAN></P><P><SPAN /></P></DIV></DIV>
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209b2d3e6be4769c285742155e5ae1b2
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
California Geological Survey, Seismic Hazards Program, Tsunami Hazards Unit
Project Manager
715 P Street, MS 1901
Sacramento
California
95814-3532
SHMP@conservation.ca.gov
(916) 322-1019
(916) 445-3334
True
Senior Engineering Geologist, Seismic Hazards Program, Tsunami Hazards Unit
Updates include: Contra Costa County: Revised September 2022 to remove bridges from the THA where they are unlikely to be affected by tsunami inundation/hazards. San Francisco County: Revised September 2022 to include nearshore exposed rocks in the tsunami hazard area.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Access_Constraints: Because digital data are easily altered those who use this file, or these data are advised to obtain the file directly from the California Geological Survey.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV>
<DIV STYLE="text-align:Left;"><P><SPAN>Use_Constraints: LICENSE AGREEMENT: © 2022 California Geological Survey. All rights reserved. No part of these data may be reproduced, transmitted, or distributed in any form or by any means, electronic or mechanical for any purpose, without the express written permission of the California Geological Survey except under the following conditions: 1) for personal use; 2) for publication in a report, in unmodified form, cite on figure or in text as "Reproduced with permission, California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022);" and (3) for publication in a report in modified form; cite on figure or in text as "Modified from California Geological Survey, Official GIS data of the Tsunami Hazard Area, (2022)."</SPAN></P><P><SPAN /></P><P><SPAN>These maps and data are prepared to assist cities and counties in identifying their tsunami hazard and are intended for local jurisdictional, coastal evacuation planning uses only. These maps and data are not legal documents and do not meet disclosure requirements for real estate transactions nor for any other regulatory purpose. The California Geological Survey, California Governor's Office of Emergency Services, the University of Southern California, and AECOM Technical Services make no representation or warranties regarding the accuracy of these data. Neither the State of California, the University of Southern California, nor AECOM Technical Services shall be liable under any circumstances for any direct, indirect, special, incidental, or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map or these data.</SPAN></P><P><SPAN /></P></DIV>
Attribute_Accuracy_Report: The accuracy of the tsunamihazard area shown on these maps and these data is subject to limitations in the accuracy and completeness of available terrain and tsunami source information, and the current understanding of tsunami generation and propagation phenomena as expressed in the models. Thus, an attempt has been made to identify a credible upper bound to tsunami hazards at any location along the coastline, it remains possible that the actual tsunami hazard could be greater in a major tsunami event.
Logical_Consistency_Report: The California Geological Survey, California Governor’s Office of Emergency Services, the University of Southern California, and AECOM Technical Services make no representation or warranties regarding the accuracy of these data. Neither the State of California, University of Southern California, nor AECOM Technical Services shall not be liable under any circumstances for any direct, indirect, special, incidental or consequential damages with respect to any claim by any user or any third party on account of or arising from the use of this map or these data.
Completeness_Report: The dataset contains tsunami hazard areas as shown on the 2021 official map of the Tsunami Hazard Area. The base map, which is included on the published map, is not included.
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report: The accuracy of the Tsunami Hazard Area shown on these maps and in these data is subject to limitations in the accuracy and completeness of the mapping conducted by the California Geological Survey. Thus, while an attempt has been made to define a maximum tsunami hazard extent at any location along the coastline, it remains possible that the actual Tsunami Hazard Area may be greater as required by the local agencies, organizations, or individuals.
Lineage:
Process_Step:
Process_Description: Tsunami hazard mapping methods Tsunami modeling is performed by AECOM Technical Services and the University of Southern California funded through the California Governor’s Office of Emergency Services by the National Tsunami Hazard Mitigation Program and through FEMA. Recent tsunami modeling uses probabilistic tsunami hazard analysis to compute tsunami waves from sources from around the Pacific Ocean and results in inundation models that are associated with different probabilities of exceedance over time. The tsunami modeling process allows for wave evolution over a variable bathymetry and topography used for inundation mapping. The California Geological Survey, Seismic Hazards Program, Tsunami Unit selected the 975-year average return period tsunami model, with a 5% probability of exceedance in 50 years, as abasis for the minimum hazard level; this minimum hazard level, along with a suite of maximum credible events, helped define the extent for inundation mapping.
For the probabilistic modeling the bathymetric/topographic data that are used in the tsunami models consist of a series of nested elevation grids. Deep ocean modeling is prepared using SRTM30+ bathymetric data (30 arc-second resolution). National Centers for Environmental Information coastal digital elevation models with a 1/3 arc-second (~10-meters) resolution and a “Mean High Water” vertical datum is used as the near-shore grids since these data represent a more conservative sea level for the intended use of the tsunami modeling and mapping. In order to enhance the 10-meter resolution inundation data, we use higher-resolution digital topographic data (e.g., 1-meter resolution LiDAR digital elevation models) to refine the location of the maximum inundation area. The location of the inundation area is refined by using digital imagery (e.g. recent National Agriculture Imagery Program imagery) and digital terrain data on a GIS platform with consideration given to historic inundation information. This information is verified, where possible, with workshops and fieldwork coordinated with local county personnel.
Data from the California Geological Survey (CGS) Tsunami Inundation Maps for Emergency Planning {2009} and the enhanced high resolution mapping of the 975 year return period probabilistic tsunami inundation model results are initially used as a minimum spatial constraint for the placement of the Tsunami Hazard Area. Guidance from local stakeholders, including emergency managers, first responders, and subject matter experts is used to help advise CGS on the placement of the final hazard area in places that would help the public and government safely evacuate during a tsunami event. The accuracy of the hazard area shown on these maps and in these data is/are subject to limitations in the accuracy and completeness of the mapping conducted by the California Geological Survey. While an attempt has been made to define a maximum tsunami hazard extent at any location along the coastline, it remains possible that the actual Tsunami Hazard Area may be greater as required by the local agencies.
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