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Lecture 5

EARTH 108 Lecture 5: Tsunami - Cause and Magnitude


Department
Earth and Environmental Sciences
Course Code
EARTH 108
Professor
Eric Hetland
Lecture
5

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Lecture 5: Tsunami (Cause, Magnitude)
lecture outline
1) the 26 Dec 2004 Sumatra earthquake
2) the 26 Dec 2004 Indian Ocean tsunami
3) tsunami speed & wavelength
4) tsunami run-up
5) other causes of tsunamis
-Plates are stuck together, and energy is accumulated. When energy is released,
the earthquake causes a tsunami.
-Tsunami is caused by a sudden displacement of a large amount of water.
-2004 Sumatra earthquake was really bad. There was 20 meters of slip.
-
Tsunami wave speed
Tsunami speed is related to the depth of the ocean,
some examples:
• 6,000 m deep  872 km/hr
• 4,000 m deep  712 km/hr
• 100 m deep  113 km/hr
find more resources at oneclass.com
find more resources at oneclass.com
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