Geography 2152F/G Lecture 3: Lecture 3 Typed Notes
22 Feb 2016
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Tsunami japanese for harbor wave : not a tidal wave. Most common: earthquakes that cause uplift of seafloor, landslides, volcano flank collapse (side collapsing, meteorites. Historic tsunamis: we went over 100 yrs between 2 tsunamis, then within 7 years, 2 major tsunamias, anything over 9. 0 is severe, notice diff in death tolls. Similar in intensity but diff in deaths. Earthquakes can cause tsunamis in 2 ways: displacement of seafloor, triggering a landslide that enters water. Generally, an eq must be at least m 7. 5 in order to trigger a tsunami. Displacement of the seafloor sets waves in motion that. When the waves reach the surface of the water, they transmit energy upward and outward spread outward (nowhere else to go: comes out in multiple directions, pulse of energy comes from bottom and spreads outwards. The waves move rapidly across the open ocean. Stage 2: waves across ocean, undetectable: can reach speeds of over 500km/hr.
