Xem mẫu
Earthquakes, Tsunamis, and the Oregon Coast
When will the next Megaquake occur? Why are tsunamis so destructive? How much of the coast is affected?
1
Earthquake Zones
Plateboundaries
Spreading ridges shallow Collisions
Sliding Earthquakesrequirestrong,
brittlerock
Accumulatedstrain
(“elastic”) deep
2
Tsunami
Sudden shifting of the ocean floor due to earthquakes, volcanic eruptions, and submarine slumping.
open ocean: short heights, long wavelengths (>100 km), and long periods 400500 mph!!!
shallow water: their length shortens and their height increases dramatically.
These are NOT tidal waves
3
Tsunami Animation
http://nctr.pmel.noaa.gov/animate.html
4
Sumatra 2004, >275,000 Dead!
5
...
- tailieumienphi.vn
nguon tai.lieu . vn