Tsunami. Intro Video… https://www.youtube.com/watch?v=Wx9vPv-T51I#t=42.

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Presentation transcript:

Tsunami

Intro Video…

Tsunami Japanese “Harbour Wave” Very long wavelengths (distance between crests or troughs) often > 100 km (high water levels for long periods of time) High Speeds ( up to 800 km/hr) Amplitude – Low (offshore) – 10 cm High (Near coast) - > 10 m

Causes of Tsunami Undersea Earthquakes (most common) Undersea Landslides Undersea Volcanic Eruption Large Meteorite Impact

Wave Amplification (Coast) Shoaling Wave slows as water depths decrease Water behind will build up Focusing Bending of waves due to uneven bathymetry Waves combine with one another Resonance Waves reflect off of shore…meet oncoming waves to create a standing wave.

What can be done? Monitor Worlds oceans Research historical records Use numerical models to understand past tsunami and to predict the risk of future tsunami events.

How people prepare for Tsunamis Constructing breakwaters and tide embankments. They use steel rods when constructing buildings to strengthen them. They move entire towns to higher ground. They stockpile drinks, food and goods. They check evacuation routes Humans can ’ t prevent tsunamis from happening but these things are helpful to protect the people living in the area that it occurs. Humans can ’ t prevent tsunamis from happening but these things are helpful to protect the people living in the area that it occurs.

Warning systems 8 Owned and maintained by National Data Buoy Center 2.6-m discus buoy DART II payload N W (48°28'41" N 129°21'32" W) Station NM WNW of Seattle Water level observation system Deep ocean Assessment and Reporting of Tsunami “DART”

Tsunami Alerts Pacific Tsunami Warning Centre (above) West Coast and Alaska Tsunami Warning Centre

Damage… Deaths (drowning due to flooding) Building destruction Negative impact on fishing industries Agricultural land destroyed

Papadapoulos-Imamura Scale (Tsunami) Not felt Scarcely felt Weak Largely observed Strong Slightly damaging Damaging Heavily damaging Destructive Very destructive Devastating Completely devastating

Newfoundland Tsunami Magnitude 7.2 Earthquake Triggered Underwater Landslide …A Tsunami 28 deaths.

13 Toronto Star Weekly, Dec 6, 1929

15 Buildings in Lord's Cove tossed and smashed by the tsunami. Photograph by H.M. Mosdell, from the collection of W.M. Chisholm Photos of Burin Peninsula after tsunami, from the Provincial Archive, Government of Newfoundland and Labrador ada.nrcan.gc.ca/histor ic_eq/20th/1929/1929 _e.php#Recent%20R esearch

Japan Tsunami 2011

Wave Height – Japan Tsunami

Incoming Japan Tsunami ature=related ature=related ture=related ture=related

Japan Tsunami Clean-up 6-months-since-ear.html 6-months-since-ear.html

Stop Disasters – Tsunami Game Reviews ways to help reduce the damage and the number of deaths resulting from a tsunami.