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Tsunami 101

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by

Teron Moore

on 8 October 2013

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Transcript of Tsunami 101

Tsunami 101
How do they form?
Types:
Tele
Local
HOW BIG WILL IT BE?
What do waves look like?
Tsunami generation
90% by earthquakes
10% by landslides (above and below water), volcanos and meteors.
Refraction (can wrap around islands/houses)
Coastal orientation (Parallel to EQ rupture means direct impact)
Funelling (more volume forced into smaller area)
Tide (higher tide means more inundation)
Friction (less friction means more inundation)
Resonance (if bay length equals wave period)
Time (longer shaking time means more dispacement)
Length of rupture (longer means more displacement)
Depth (shallow EQ means more displacement)
Material (sediments usually displace more than hard rock)
Magnitude (at LEAST 7.0)
Earthquake features
Shoreline features
WAVE BASICS
IMPACTS

Life
Property
Environment
Economy
Facts:
500-800 kms/hr in open ocean, yet only slight rise.
Slow and grow in shallow.
Wave action can last for days.
30-60 mins normal period (time between waves) for large tsunami.
Depth of water (Deeper means more potential energy)
Tsunami History
1700 Cascadia Subduction Zone
1964 Alaska (130 fatalities)
2004 Indonesia (over 200,000 fatalities)
2010 Chile (525 fatalities)
2011 Japan (over 15,000 fatalities)
2012 Haida Gwaii
Thank you, Happy Sailing

Any Questions?

Teron.Moore@gov.bc.ca
Risk to British Columbia
Full transcript