Earthquakes
Two types of crust “float” on the upper mantle: oceanic crust (heavier, sinks lower) continental crust (lighter, floats higher)
Three types of plate convergence oceanic – continental oceanic – oceanic continental - continental
Oceanic – continental plate convergence Nazca plate – South America plate
Oceanic – oceanic plate convergence New Hebrides Trench near Vanuatu
Continental – continental plate convergence India/Eurasia plate collision (forms Himalayan Mountains)
Earthquake Motion
Historical seismic activity in Canada
1906 San Francisco Earthquake
Mercalli Richter
1964 Alaska earthquake damage map: modified Mercalli scale III - IV V VI VII VIII - X
Liquefaction and slumping Anchorage, Alaska
Earthquake-proof buildings
Is a major earthquake in California, Alaska or Japan of any concern thousands of kilometers away, in Hawaii?
Tsunami (seismic wave)
The power of a tsunami