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A
tsunami is a series of waves that can be generated by an earthquake or a
landslide. The time it takes for a tsunami to reach land depends
on when and where the earthquake or landslide occurs.
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A
tsunami caused by an earthquake a few miles off the coast is called a
“locally generated” tsunami. It will arrive within a few minutes
of the quake. Coastal community residents probably will feel such
an earthquake. The earthquake may be the only warning of an
approaching tsunami so it is important to respond quickly.
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A
tsunami caused by large earthquakes centered near Alaska and other
distant parts of the Pacific Ocean is a “distant source” tsunami. The
first waves from one of these events will take several hours to reach
the Southern California coastline, and federal (National Weather
Service) or state (OES or California Integrated Seismic Network)
authorities will issue a Tsunami Alert or a Tsunami Warning.
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In
Santa Monica, much of the city is protected from the devastating effects
of tsunamis by the Palisades Bluffs along the Pacific Coast Highway
(PCH). The bluffs provide protection for most of the populated
area located north of the Santa Monica Pier.
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Areas
not protected by the bluffs include areas located between the bluffs and
the ocean, as well as the areas south of the Pier. In these
specific areas, residents are advised to evacuate ¼ mile (four blocks)
inland in the event of a tsunami evacuation or strong earthquake lasting 20
seconds or more.
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All
scientific research indicates that the largest possible tsunami
inundation is about 30 feet. Los Angeles County officials
recommend 40 feet as the maximum inundation level. This means
that, in the event of a tsunami, the sea level would be expected to rise
no more than 40 feet, so a ¼ mile evacuation is recommended for those in
areas below the bluffs and south of the Pier.
IF YOU FEEL AN
EARTHQUAKE, DROP, COVER AND HOLD UNTIL THE SHAKING STOPS.
Remember, the earthquake may be the only warning of an approaching
tsunami so it is important to respond quickly, NOT WAITING FOR AN
OFFICIAL WARNING.
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In the
event of a tsunami evacuation, people in Santa Monica will be notified
by a number of sources. The Los Angeles County lifeguards are
responsible for making notifications along the beach and will use
vehicles and aircraft to notify the public. City emergency
personnel will use vehicles including police, fire, public works and
others to notify the public of evacuation orders, aided by telephone
trees and other information avenues, including the City of Santa Monica
website and City Hall on Call (458-8999). Local media will, of
course, be an important source of emergency notification to the public.
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If you
are on the beach or near the beach, move inland ¼ mile to higher ground.
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Turn
off any active heating or cooking appliance but don't take the time to
turn off gas or electric service.
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If you
are able, WALK rather than drive our of harm’s way. This will
reduce the likelihood of traffic congestion.
Following
are safe refuges and evacuation centers:
- Santa Monica High School
- 601 Pico Blvd.
- Olympic High School - 721 Ocean Park Blvd.
- Roosevelt Elementary
School - 801 Montana Ave.
- Santa Monica College -
1900 Pico Blvd.
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Use
common sense. Do not go to the coast to see a tsunami if an alert
or warning has been issued. If you are on the beach following an
earthquake, and you see the water receding in a manner that is not
normal, quickly make your way to higher ground.
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Stay
away from coastal areas until the all clear is given by designated
safety officials. |