Ocean Observing Systems (OOS) and Tsunami Warnings

Ocean Observing Systems (OOS) have many sensors. One function is to detect earthquales using seismometers and hydrophones, and tsunamis using bottom pressure recorders.
A massive 8.9 magnitude earthquake hit the Pacific Ocean nearby Northeastern Japan at around 2:46pm on March 11 (JST) causing damage with blackouts, fire and tsunami.
These videos give some background information.

http://www.youtube.com/user/NOAAPMEL?feature=mhum#p/c/0/2mKbFORiDzg

http://www.bbc.co.uk/news/world-asia-pacific-12709598

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