Point Dume - LACOA.org

California Emergency Management Agency
California Geological Survey
University of Southern California
Tsunami Inundation Map for Emergency Planning
Point Dume Quadrangle
State of California
County of Los Angeles
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118°45'0"W
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118°52'30"W
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118°52'30"W
METHOD OF PREPARATION
Initial tsunami modeling was performed by the University of Southern California (USC)
Tsunami Research Center funded through the California Emergency Management Agency
(CalEMA) by the National Tsunami Hazard Mitigation Program. The tsunami modeling
process utilized the MOST (Method of Splitting Tsunamis) computational program
(Version 0), which allows for wave evolution over a variable bathymetry and topography
used for the inundation mapping (Titov and Gonzalez, 1997; Titov and Synolakis, 1998).
The bathymetric/topographic data that were used in the tsunami models consist of a
series of nested grids. Near-shore grids with a 3 arc-second (75- to 90-meters)
resolution or higher, were adjusted to “Mean High Water”sea-level conditions,
representing a conservative sea level for the intended use of the tsunami modeling
and mapping.
118°45'0"W
TSUNAMI INUNDATION MAP
FOR EMERGENCY PLANNING
State of California ~ County of Los Angeles
POINT DUME QUADRANGLE
SCALE 1:24,000
0.5
0.25
0
0.5
1
Miles
1,000 500
0
1,000
2,000
3,000
4,000
5,000
Feet
In order to enhance the result from the 75- to 90-meter inundation grid data, a method
was developed utilizing higher-resolution digital topographic data (3- to 10-meters
resolution) that better defines the location of the maximum inundation line (U.S.
Geological Survey, 1993; Intermap, 2003; NOAA, 2004). The location of the enhanced
inundation line was determined by using digital imagery and terrain data on a GIS
platform with consideration given to historic inundation information (Lander, et al.,
1993). This information was verified, where possible, by field work coordinated with
local county personnel.
The accuracy of the inundation line shown on these maps 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, although an attempt has been made to identify a credible upper
bound to inundation at any location along the coastline, it remains possible that actual
inundation could be greater in a major tsunami event.
This map does not represent inundation from a single scenario event. It was created by
combining inundation results for an ensemble of source events affecting a given region
(Table 1). For this reason, all of the inundation region in a particular area will not likely
be inundated during a single tsunami event.
0.5
Titov, V.V., and Gonzalez, F.I., 1997, Implementation and Testing of the Method of Tsunami
Splitting (MOST): NOAA Technical Memorandum ERL PMEL – 112, 11 p.
Titov, V.V., and Synolakis, C.E., 1998, Numerical modeling of tidal wave runup:
Journal of Waterways, Port, Coastal and Ocean Engineering, ASCE, 124 (4), pp 157-171.
U.S. Geological Survey, 1993, Digital Elevation Models: National Mapping Program,
Technical Instructions, Data Users Guide 5, 48 p.
0.5
1
Table 1: Tsunami sources modeled for the Los Angeles County coastline.
Sources (M = moment magnitude used in modeled
event)
Local
Sources
Intermap Technologies, Inc., 2003, Intermap product handbook and quick start guide:
Intermap NEXTmap document on 5-meter resolution data, 112 p.
National Atmospheric and Oceanic Administration (NOAA), 2004, Interferometric
Synthetic Aperture Radar (IfSAR) Digital Elevation Models from GeoSAR platform (EarthData):
3-meter resolution data.
0
Kilometers
References:
Lander, J.F., Lockridge, P.A., and Kozuch, M.J., 1993, Tsunamis Affecting the West Coast
of the United States 1806-1992: National Geophysical Data Center Key to Geophysical
Record Documentation No. 29, NOAA, NESDIS, NGDC, 242 p.
0.25
Distant
Sources
Anacapa-Dume Fault
Catalina Fault
Channel Island Thrust Fault
Newport-Inglewood Fault
Santa Monica Fault
Palos Verdes Landslide #1
Palos Verdes Landslide #2
Cascadia Subduction Zone #2 (M9.2)
Central Aleutians Subduction Zone#1 (M8.9)
Central Aleutians Subduction Zone#2 (M8.9)
Central Aleutians Subduction Zone#3 (M9.2)
Chile North Subduction Zone (M9.4)
1960 Chile Earthquake (M9.3)
1964 Alaska Earthquake (M9.2)
Japan Subduction Zone #2 (M8.8)
Kuril Islands Subduction Zone #2 (M8.8)
Kuril Islands Subduction Zone #3 (M8.8)
Kuril Islands Subduction Zone #4 (M8.8)
Tsunami Inundation Line
Tsunami Inundation Area
PURPOSE OF THIS MAP
This tsunami inundation map was prepared to assist cities and counties in identifying
their tsunami hazard. It is intended for local jurisdictional, coastal evacuation
planning uses only. This map, and the information presented herein, is not a legal
document and does not meet disclosure requirements for real estate transactions
nor for any other regulatory purpose.
March 1, 2009
A suite of tsunami source events was selected for modeling, representing realistic
local and distant earthquakes and hypothetical extreme undersea, near-shore landslides
(Table 1). Local tsunami sources that were considered include offshore reverse-thrust
faults, restraining bends on strike-slip fault zones and large submarine landslides
capable of significant seafloor displacement and tsunami generation. Distant tsunami
sources that were considered include great subduction zone events that are known to
have occurred historically (1960 Chile and 1964 Alaska earthquakes) and others which
can occur around the Pacific Ocean “Ring of Fire.”
MAP EXPLANATION
Areas of Inundation Map Coverage
and Sources Used
Los
Santa
Malibu
Angeles
Monica
Harbor
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The inundation map has been compiled with best currently available scientific
information. The inundation line represents the maximum considered tsunami runup
from a number of extreme, yet realistic, tsunami sources. Tsunamis are rare events;
due to a lack of known occurrences in the historical record, this map includes no
information about the probability of any tsunami affecting any area within a specific
period of time.
Please refer to the following websites for additional information on the construction
and/or intended use of the tsunami inundation map:
State of California Emergency Management Agency, Earthquake and Tsunami Program:
http://www.oes.ca.gov/WebPage/oeswebsite.nsf/Content/B1EC
51BA215931768825741F005E8D80?OpenDocument
University of Southern California – Tsunami Research Center:
http://www.usc.edu/dept/tsunamis/2005/index.php
State of California Geological Survey Tsunami Information:
http://www.conservation.ca.gov/cgs/geologic_hazards/Tsunami/index.htm
National Oceanic and Atmospheric Agency Center for Tsunami Research (MOST model):
http://nctr.pmel.noaa.gov/time/background/models.html
MAP BASE
Topographic base maps prepared by U.S. Geological Survey as part of the 7.5-minute
Quadrangle Map Series (originally 1:24,000 scale). Tsunami inundation line
boundaries may reflect updated digital orthophotographic and topographic data that
can differ significantly from contours shown on the base map.
DISCLAIMER
The California Emergency Management Agency (CalEMA), the University of Southern
California (USC), and the California Geological Survey (CGS) make no representation
or warranties regarding the accuracy of this inundation map nor the data from which
the map was derived. Neither the State of California nor USC 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.