GG231 Chapter Notes - Chapter 4: Subduction, Oceanic Basin, Thrust Fault
Document Summary
Waves at heights of up to 40 m above sea level and 10 km inland. Source of quake: thrust fault and subduction earthquakes. Because of education, some people were able to see warning signs and evacuate to higher radiation levels up to 1000x higher ground. Introduction to tsunamis tsunami = series of waves caused by the displacement of a large volume of water (ocean or large lake) Wavelengths in ocean = 200 km and amplitudes are less than 1m. Caused by earthquakes, landslides, volcanic eruption, asteroid/comet. Earthquake-triggered tsunamis: takes earthquake of 7. 5 m or higher to generate a damaging tsunami, 4 stage process that culminates with the tsunami rushing ashore: Displacement of the seafloor set in motion oscillatory waves that transmit energy outward and upward from the source, then the waves intercept the ocean surface and spread outward in the deep ocean, waves are more rapid and spread.
