cascadia preparedness · factors affecting survival of tsunami •physical factors –geography and...
TRANSCRIPT
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Cascadia
Preparedness
Tsunami Road
Show
2012
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Why we’re here talking about
earthquakes and tsunamis ….
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Getting from here to there …
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What we’ll be talking about …
• Cascadia Subduction Zone
• March 11 Japanese earthquake and tsunami
• Preparing your family
• Preparing your community
• Preparing you
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Know your Cascadia Subduction Zone
• 600 miles long, from northern
California to British Columbia
• Capable of producing very large
earthquakes (M9+) that impact a
wide area
• Similar in size and impact to the
2004 Sumatra earthquake
• Can produce devastating tsunamis
• 10% chance of a mega-thrust
earthquake in the next 30 years
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Know your Cascadia Subduction Zone
• Last Cascadia Subduction Zone earthquake occurred in 1700
• When will the next one occur? – We just don’t know
• Average recurrence: – 240 years (south of Cape Blanco)
– 5-600 years (entire length)
– 190-1,200 years between EQ
• We’re in the Zone
• And it WILL happen again
Ghost forest at Copalis River, WA
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What are the hazards?
2010 Canterbury, New Zealand
Surface fault rupture
(Not common on land in Oregon)
2009 Wenchuan, China
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What are the hazards?
• Strong ground shaking
2010 Haiti earthquake
2011 Tohoku earthquake
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What are the hazards?
2004 Sumatra
Coastal subsidence
Mainichi Shimbun, Reuters
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What are the hazards?
Landslides in Ferndale, WA
Landslides
2010 Taiwan
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What are the hazards?
Liquefaction
1964 Alaska
2011 Christchurch, New Zealand
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What are the hazards?
2004 Indonesian tsunami
Tsunami
2011 Tohoku tsunami
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Tsunami
• Local – Caused by a subduction zone earthquake near
the Oregon shore
• Distant – Caused by a subduction zone earthquake far
away from the Oregon shore
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Distant Tsunami
• Arrives 4 + hours after the earthquake
• Lower damage and flooding than local
tsunamis
• National Tsunami Warning System can warn
you
hrs
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Local Tsunami
• Arrives minutes after the earthquake
• Much higher waves
• Much further inland penetration
• NOAA Tsunami Warning System ineffective
• Earthquake = Only Warning
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Stages of a Tsunami
Generation Propagation Inundation
How are tsunamis
created? How do they move
through the ocean?
What happens when
they hit land?
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Tsunami genesis
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Tsunami propagation
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Tsunami Inundation
Mainichi Shimbun, Reuters
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Tsunami Damage
Yomiuri Shimbun, AFP/Getty Images
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What you really need to know
about a tsunami
• Three Things
– It is a series of waves
–Stay away for 24 hours
–Even small tsunamis can cause damage
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March 11, 2011
Tohoku-oki Earthquake and Tsunami
Seismic Intensity Map Locating Lost Family and Friends
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Know your hazard
Probability versus Possibility
• Planning assumptions led to inadequate mitigation
– (Probable) Response planning was based on recurrence
of the1896 to Meiji Sanriku or 1960 Chile tsunamis.
– (Possible) 869 Jogan earthquake and tsunami
• Significantly larger,
• Geologic evidence for Magnitude 9 EQ/tsunami ignored
• Viewed as an “outlier,” a 1,000-year event - low probability.
• Planning scenario based on “100-year event.”
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Human impact
– 22,600 persons killed or missing nationwide
• 15,500 confirmed deaths
• 92.4% drowning
– 107,000 buildings collapsed, and another 111,000
partially collapsed
• BUT ….
– 6.5 million people live within 200 miles of rupture
zone
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Instant Automated Earthquake Magnitude
Too Small but Fit Expectations
• 1st magnitude = 7.9
• Underestimated tsunami
• 2nd and 3rd magnitudes = 8.9, 9.0
• EQ damage causes no updated tsunami warnings
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Factors affecting survival of tsunami
• Physical factors
– geography and topography
– distance to high ground
– pre-disaster land use
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Factors affecting survival of tsunami
• Human factors
– time of the event
– limited mobility
– care giving behavior
– past experience w. small
tsunamis (always more
frequent than big ones)
– instinct to protect property
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Survival factors: Preparedness + “Herd Instinct”
• Regularly practiced drills
• Follow other people evacuating
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Prepare your community …
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Recommendations • Enhance evacuation routes
– Harden infrastructure
– Clear way finding – night or day
– Practice, practice, practice
• Build vertical evacuation
refuges where high ground is
not available.
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Embed tsunami information in ambient
built environment
R. Wilson
Tsunami Height
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Cascadia Planning Assumption
• Magnitude 9+ earthquake probable
• Three metropolitan cities in impact zone
–Portland
–Seattle
–Vancouver, B.C.
• Heavy urbanization along the I-5 corridor
• Approximately 9.5 million people live in the hazard zone in WA & OR
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Japanese emergency response challenges.
• Extreme scale of the tsunami disaster
• Early reporting hampered by damage.
• Satellite telephone access limited.
• Highways/railways cut by landslides, tsunami.
• Marine access to Iwate, Miyagi, and Fukushima
prefectures blocked 1st day by tsunami action,
later by damaged docks + floating debris.
• No fuel (loss of power and facility damage).
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Responders as victims
• Lost political and response personnel,
– Emergency Facilities
destroyed.
•Otsuchi
Lost mayor, seven senior staff, and 31
other municipal employees in the tsunami.
•MinamisSanriku
Emergency operations and tsunami
warning center was destroyed. 10 staff
members survived by clinging to antennas
on the roof.
MinamisSanriku
Tsunami Warning
Center
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Recommendations: Ensure Critical Continuity
• Relocate critical facilities out of inundation zone
• Retrofit critical facilities
• Prohibit building new critical facilities in
inundation zone (already the law in Oregon – SB379)
• Construct critical facilities to meet the most robust
standards
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Emergency Shelter and Housing
• About 470,000 Japanese required shelter
• Local governments provides care and sheltering.
• National government only assists.
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Challenges to sheltering in Japan
• Local government officials and facilities did not
always survive.
• Pre-designated shelters destroyed.
• Food and water delayed up to three days.
• Sheltering - mix of planned and ad hoc
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In-place sheltering
• Family or friends or own homes
• Local shelters (can be a barrier to finding folks).
• Lifelines (power, water, sewage, gas) lacking for
weeks.
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Recommendations
• Plan robust sheltering
• Bring the message home
– Personal prep
– Neighborhood prep
– Community prep
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Japanese Recovery
• Two supplementary national budgets
– ¥4.153 trillion (US $51.3 billion)
– ¥2 trillion
• Minami-sanriku
– Will take 10 years, with three 3-year phases
• lifeline restoration
• recovery needs and potential relocation of buildings
• redevelopment and economic development.
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Recommendations
• Comprehensive resiliency planning-50 year plan
• Land use planning
• Hardened lifeline infrastructure
• Strengthen schools (seismic retrofit program)
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Japanese Tsunami Marine Debris
• LOTS of media coverage lately
• Not very likely to have reached us by now
• Estimated to reach us 2013
• The debris is no longer in a “debris field.”
• http://marinedebris.noaa.gov/info/japanfaqs.html
• NOAA is coordinating the debris issue
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Prepare your family …
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Assumptions
• Will be at home/work
• Will be able to get
home/work
• Will know what to do
• Will have emergency
plans/supplies
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Prepare in Seven steps
* 1- Identify Hazards
* 2- Create a disaster plan
* 3- Prepare disaster kits
* 4- Identify and fix weaknesses
* 5- Protect yourself during earthquake
* 6- Evacuate if necessary
* 7- Follow your earthquake plan
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Prepare in Seven steps
* 1- Identify Hazards
* Start now by identifying items that may
fall, topple, or slide.
* Secure potentially hazardous and
valuable items.
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Secure furnishings
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Prepare in Seven steps
* 2- Create a disaster plan
* Practice Drop, Cover and Hold on.
* Plan on how to respond after an
earthquake or tsunami
* Plan how to communicate and recover
* Practice, practice, practice!
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But what can I do?
• Have a plan! Know what to do!
– Who ya gonna call?
– Where will my family be and how will I reach them?
• Children at school or activities
• Plan for pets and livestock
• Have an out-of-town emergency contact
– How are you going to contact your family if phone
service is not available?
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But what can I do?
• Have a plan! Know what to do!
– Where will I get medical help?
• Take first aid and CPR classes
• Plan for back-up if family needs life-saving medical
equipment
– Have you taken first aid classes?
• What is in your home first aid kit?
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But what can I do?
• Have a plan! Know what to do!
– Am I prepared to live without the essentials?
• Food
• Water
• Medicine
• Toilet paper/ Tooth brush
• Fill up the gas tank in your car frequently
– How much toilet paper do you have in your house right
now?
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But what can I do?
• Have a plan! Know what to do!
– How will I pay for things?
• Have cash on hand
• ATMs/Plastic cards will likely not work
– How much do you have on hand?
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Prepare in Seven steps
* 3- Prepare disaster kits
* Personal/Office
* Household
* Car
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But what can I do?
• Go-Kit – minimum of 72 hours
– Car
– Office
– Home
• Have 3 weeks worth of:
– Food
– Water
– Medicine
– Anything else you deem a necessity
• What do you consider a necessity? (got a pet?)
• http://www.ready.gov/america/getakit/
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Prepare in Seven steps
* Common building
problems
* Inadequate
foundations
* Unbraced cripple
walls
* Soft first stories
* Unreinforced
masonry
* 4- Identify and fix weaknesses
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Prepare in Seven steps
* 5- Protect yourself during earthquake
* Drop, Cover and Hold on
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Prepare in Seven steps
* 6- Evacuate if necessary * Know if you are in the Zone
* Do not wait for an official warning
* Check for injuries
* Check for damage
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But what can I do?
• Have a plan! Know what to do!
– Do I live, work or visit in a tsunami
hazard zone?
• Know your evacuation route and
PRACTICE!
• Know where you will evacuate to.
• If you are in a safe area, stay there!
• There will be no official warning.
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Prepare in Seven steps
* 7- Follow your earthquake plan * Once safe, continue your disaster
preparedness plan.
* Stay away from the beach.
* Be in communication
* If you cannot stay in your home… * Tell a neighbor and your out-of-state contact
where you are going
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Great Oregon ShakeOut
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You can’t prevent an Earthquake,
but you can prepare for one
Building a culture of prevention is not easy
because the cost of prevention has to be
paid in the present, while its benefits lie in
the distant future. Moreover, the benefits
are not tangible; they are the disasters
that did not happen. (to paraphrase Kofi Annan)