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Glenn Dolphin

on 22 February 2016

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Transcript of Tsunami

The Phenomenon
THe hazard
Great wave Kanagawa: http://www.wallpapershd1080p.com/wallpaper/archives/27347

Tsunami simulation: http://physics.stackexchange.com/questions/6720/why-do-tsunami-waves-begin-with-the-water-flowing-away-from-shore

Meteotsunami story: http://www.nature.com/articles/srep11682#f4

津波From the Japanese, meaning, "harbor wave"
Subduction zone earthquakes
Impact from asteroid
Explosive volcanic eruptions
and, yes, nuclear explosions
Long period waves (30-60 minutes)
Wavelength in 100s of meters
Any particle affected by the wave is displaced in a circular motion
Wave displacement decreases with depth
Wave velocity can be calculated V=(gxd)
Velocities up to 950km/hr (10x faster than ocean waves)
Distinctive drop in water first (but not always)

Pictures show rocks moved by a tsunami caused by the great eruption of Krakatoa.

Meteotsunami formation is related to very specific and comparatively rare resonant situations that lead to strong amplification of the initial open-seawaves.

Generated by short-term, small-scale (horizontal dimensions of ~100 km) disturbances that normally exist only for a few hours and cannot propagate over long distances.
Full transcript