Please enable JavaScript.
Coggle requires JavaScript to display documents.
Tsunamis: Violent Ocean (Common triggers (Earthquake-Caused (Necessary…
Tsunamis: Violent Ocean
What is a Tsunami
Tsu = harbour, nami= waves
A wave of water that is generated by the sudden displacement of the seafloor or the disruption any body of standing water
-
-
-
Common triggers
-
Earthquakes, volcanoes, mass movements, impacts (secondary effect of other natural hazards)
Earthquake-Caused
Necessary condition: Submarine fault rupture that causes a vertical movement of the seafloor (uplifting/downdropping), offsetting huge mass of water
-
-
Common at convergent plate boundaries, especially subduction zones in Pacific Ocean
Do not occur at transform fault or divergent plate boundaries because horizontal motion and too small vertical motion
Volcano-Caused
cause tsunamis by adding volcanic debris to ocean, or creating large blasts that lead to a flank collapse
The newly added material cause a sudden change in the seafloor topography that can produce a massive displacement of water
Landslide-caused
-
Closely related to: rockfalls, volcanic flank collapses, earthquakes triggering mass movements of aquatic sediment
Impact-caused
75% of earth is water, so an asteroid would probably hit the ocean, generating a massive tsunami
-
Disaster Mitigation
Seismographs, pressure sensors on seafloor
-
-
DART buoys read inconsistencies in pressure readings, and send it to a satellite
-