MEA 200 Lecture Notes - Lecture 13: Japan Trench, World Data Center, Subduction
30 Mar 2017
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Document Summary
Great wave off the coast of kanagawa. No connection with tides (not tidal wave) Originate from sudden sea floor topography changes. Can grow 10s to 100 meters at the coast. Travels fast in deep ocean (jet airplane) but slows down at coast (but cannot outrun) In deep ocean - tsunami has long wavelength, travels fast, small amplitude. As it approaches shore - it slows. Since energy is conserved, amplitude builds up - very damaging. Encompasses entire water column, regardless of ocean depth. Can pass undetected under boats in open ocean. Ocean retreats back before tsunami comes ashore. Wall of water (not breaking surf wave) Tsunami watch issued when potential for tsunami exists. Tsunami warning unusual wave activity verified. Pacific tsunami warning center (ptwc) honolulu, hi. Uses seismic wave recordings to forecast tsunami. Deep ocean assessment and reporting of tsunami (dart) Deep ocean buoys can measure wave heights, verify tsunami and reduce false alarms.
