(NOAA) According to scientists, tsunamis produce "internal gravity waves" in the atmosphere — waves of energy that ripple up through the sky.
Satellites Use Ripples in Space to Detect Tsunamis
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AUGUST 06, 2010
Michael Reilly, Discovery News

Tsunamis are born in the violent interaction of two simple ingredients: rock and water. Outer space would seem like the last place to put an instrument designed to detect one of these potentially devastating waves.
But a new study proposes to do just that, using global positioning system (GPS) satellites already in orbit.
Read the story: www.msnbc.msn.com/id/38591746
This research is being done by a team at the Institute of Geophysics of Paris: www.ipgp.fr