Lecture 4 - Tsunamis Flashcards
1
Q
Japan Tsunami
A
- March 11, 2011, 16 000 deaths
- M 9.0 earthquake triggered it
- Most expensivee disaster in history
- Three nuclear reactors were damaged —> Meltdown
2
Q
Tsunami?
A
A series of waves caused by the displacement of a large volume of water
3
Q
What causes tsunamis?
A
- earthquakes uplifting/subsiding the sea floor
- underwater landslides
- volcano flank collapse
- submarine volcanoic explosion
- asteroids (MEGA TSUNAMI)
4
Q
Where do tsunamis move the fastest?
A
Deep ocean, where the frequency of crests is large and the amplitude is small
5
Q
What happens to a tsunami as it nears land?
A
Waves slow, increasing amplitude and frequency, water s pushed inland (trough may arrive first)
6
Q
Indonesia Tsunami
A
- Dec. 26 2004, 230 000 deaths
- M 9.1 earthquake off the west coast of sumatra
- crossed the entire indian ocean in 7 hours
7
Q
Krakatoa Eruption
A
- Second most deadly tsunami triggered by volcanic flank collapse
8
Q
Secondary effects of tsunamis?
A
- fires
- contaminated water supplies
- disease
- nuclear reactor explosion
