tsunami seismic sea wave - commackschools.org · what is a tsunami? •from the japanese word...
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TsunamiSeismic Sea Wave
What is a tsunami?• From the Japanese word tsunami meaning
"harbor wave” and are technically called “Seismic Sea Waves”
•Often mistakenly called "tidal waves”
• They have nothing to do with tidal action!
• Seismic sea waves are caused by earthquakes or submarine landslides
Tsunamis grow as they approach shore!
No one notices them at sea!
Tsunamis can happen anywhere (especially around the ring of fire)Tsunami
Tsunami Ship View Video: https://www.youtube.com/watch?v=OdhfV-8dbCE
Nat. Geo Tsunamis
Tsunamis – “Tidal Wave”• Tsunami - a large water wave caused by an under sea
earthquake.
• When an earthquake jolts the ocean floor, plate movement causes the ocean floor to rise slightly and push water out of its way.
TsunamisLargest Wave
The Facts about December 26th
A great earthquake occurred at 6:58 a.m. on Sunday, 26 December 2004. The magnitude 9.0 quake was located near Northern Sumatra
This is the fourth largest earthquake in the world since 1900 and is the largest since the 1964 Prince William Sound, Alaska earthquake.
The earthquake moved crust about 10m
A section of the northern shore of Aceh, Sumatra, Indonesia, pre- and post-tsunami (by Digital Globe)
A section of the northern shore of Aceh, Sumatra, Indonesia, pre- and post-tsunami (by Digital Globe)
Page 5 of ESRT
At Sumatra, the Indian plate was subducted beneath the
Burma plate
The relative motion of the two plates has been
6cm/yr.
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