Tsunami! Are)you)Prepared? · Tsunami Warning Levels Warning!–!Ini:ally!based!solely!on!seismic!!...
Transcript of Tsunami! Are)you)Prepared? · Tsunami Warning Levels Warning!–!Ini:ally!based!solely!on!seismic!!...
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Tsunami! Are you Prepared?
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Tsunami!
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Local Tsunami from Cascadia Earthquake
Overriding Plate Downgoing Plate
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How do we know?
Evidence of Cascadia earthquakes:
Land-level changes
Dead forest along the Copalis river in western Washington.
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How do we know? Evidence of past tsunamis: Sand deposits
Tsunami sands
A.D. 1700 ground surface
Subsided marsh along the Niawiakum River, southwest Washington
Time series: Aerial view
Before tsunami
Tsunami inundates land and goes
upstream
Sand deposits left by tsunami
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Local (Cascadia) Tsunami
Waves & Surges
Arrive in 25+
minutes
ConGnue 10-‐12+ hours
Back & Forth
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The DestrucGve Surge
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Debris
InundaGon of coastal communiGes with strong currents
Buildings Destroyed
Fires Debris
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CommunicaGon Outages
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Road and Highway Damage
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How will the community be noGfied?
• Natural cues are the warning no:fica:on! Ø What are the Natural cues?
• Your AcGons: Ø Drop, Cover and Hold – Head to high ground
ü Do not Drive – WALK!
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• 7 Day Forecast
• Watches/Warnings/Advisories
• Hourly Weather Condi:ons
• Climate and River Informa:on
• Warnings broadcast 24 hours/Day
• Used to Ac:vate EAS for Weather Events that are life threatening
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Scheduled Tests
v Weekly - Wednesdays (11am – Noon)
v Monthly
v Annually - in coordination with the Emergency Alert System (EAS) committee.
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Weather/Hydrologic Warning Levels } Warning: A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. A warning means weather condi:ons pose a threat to life or property. People in the path of the storm need to take protec:ve ac:on.
} Watch: A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, loca:on or :ming is s:ll uncertain.
} Advisory: An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. Advisories are for less serious condi:ons than warnings.
Could lead to situa:ons that may threaten life or
property.
Have a plan of ac:on and listen for more
informa:on.
You need to take protec:ve ac:on!
Poses a threat to life or property.
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Tsunami Warning Levels
Warning – Ini:ally based solely on seismic data, are issued as quickly as possible indica:ng that a significant inunda:on may occur. Advisory – Indicates poten:al beach and harbor danger; significant widespread inunda:on is not expected. Watch – Tells communi:es that a poten:ally dangerous distant event has occurred and to be alert for more informa:on. Informa:on Statement – Issued to reassure those experiencing an earthquake that condi:ons do not warrant tsunami genera:on.
National Tsunami Warning Center http://wcatwc.arh.noaa.gov/
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Escape the Tsunami
• Tsunami zones • Evacua:on Routes
• Assembly Areas
Learn
• Go on Foot • Assist Others • Consider Op:ons
PracGce
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Know the community Tsunami Hazard Zone and have a Tsunami EvacuaGon
Map
“Local tsunami evacua/on maps developed from inunda/on modeling, mapping, and community input”
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Local Event – WALK!
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Use common sense!
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Solu:ons: • Ver:cal evacua:on • Ver:cal evacua:on refuge
Issues: • No high ground exists • No :me to go inland to high ground • Special needs popula:ons
www.facebook.com/ProjectSafeHaven
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IdenGfy High Ground
• Signs • Evacua:on Routes • Safe Areas
– Assembly Areas – Ver:cal Evacua:on Op:ons
Don’t forget to grab your emergency kit
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Having a plan and pracGcing it works!
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The Discipline to STAY PUT!
WHEN DO YOU RETURN to the
Tsunami Hazard Zone?
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Cancellation versus All-Clear
Cancellation Message • Issued by TWCs • Cancels warning, watch, and advisory
messages • Means that destructive waves have stopped • Does NOT mean it is safe to return to
Tsunami Hazard Zone
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All-Clear
• Issued by LOCAL AUTHORITY • Issued when it is SAFE to re-enter the
Tsunami Hazard Zone
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Washington’s Distant Tsunami Hazard Source
Due to the various tsunami sources along the “Ring of Fire”, distant source tsunamis are more frequent than local source tsunamis.
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Mass NoGficaGon Systems
NOAA Alert Radio
AHAB RADIO TV/Radio
Social Media
Distant Tsunami NoGficaGon
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Re-‐entry Aaer a Distant Tsunami
• ALL CLEAR • Re-‐enter with Cau:on • Damage
– Harbors – Beaches – Low-‐lying areas – Roads, Bridges
• Clean up
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FROM A DISTANT TSUNAMI?