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Transcript of Tsunami 101
How do they form?
HOW BIG WILL IT BE?
What do waves look like?
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)
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)
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
Risk to British Columbia