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Here's one classy website for ya:

http://www.drgeorgepc.com/Volc...

Unfortunately, as with most, this idea is not new:

A google search for "satellite early warning tsunami":
http://www.google.com/search?client=opera&rls=en&q=satellite+early+warning+tsunami&sourceid=opera&ie=utf-8&oe=utf-8&safe=active
Comes up with the following results:
http://ec.europa.eu/world/tsunami/other-measures/early_warning.htm
http://www.drgeorgepc.com/TsunamiRWarningSystem.html
http://www.esa.int/esapub/bulletin/bulletin124/bul124h_martin_neira.pdf

I'm not picking apart your idea. Just you googleing (How the hell do you spell Googleing? Googling?) skills, I guess.

And, didn't I see a /. story about this a few months ago? Maybe around the time of the last big Tsunami?

- Zotdogg

First, Ash does and can fall right out of the sky during an eruption, it is called a nuee ardente or pyroclastic flow. http://www.geo.mtu.edu/volcanoes/hazards/primer/py ro.html It happened at St. Helens and if the eruption is significant enough it will most likely produce one. It is more common than rare. If the eruption is big enough to cause this type of eruption, you can be assured that the ash can and often does reach into the upper limits of the atmosphere and can have a long term effect on the atmosphere and even cause climate changes and disrupt the ozone layer.

Second, volcanoes can develop quite rapily, Paricutin for example.http://vulcan.wr.usgs.gov/Volcanoes/Mexico /description_mexico_volcanoes.html

Third, Krakatoa's devopement was due to subduction and did have the high silicic lava that causes plugging, but the explosive event it created was due more to the ocean water getting into the crater that resulted from the huge amount of magma loss resulting in a collapse of the island. This ocean water was super heated and is called a phreatomagmatic erruption. This is what is thought to be mostly responsible for the resultant tsunami and destruction of Krakatoa.http://www.drgeorgepc.com/TsunamiVolcanic Mechanisms.html

Forth, As for Mars, there is no source for internal heating that drives the processes that lead to vulcanism anymore. The current belief is that the heat source is either to small or has cooled sufficiently to have ceased any geological surface processes. It has probably been more than 20 million years since a volcano has errupted on Mars.http://volcano.und.edu/vwdocs/planet_volcano/ mars/Overview.html

Fifth, As for igneous rock "not flexing" it is pretty flexible in the molten state. It is no less "flexible" than other rock types, metamorphic and sedimentary. Usually geologists discuss rocks in terms of hardness using the standard Mohs scale where talc is 1 and diamond is 10.http://geology.about.com/library/bl/blmohsscale .htm

I believe to retain credibility it is helpful to have facts straight before stating them.

http://www.drgeorgepc.com/TsunamiMegaEvaluation.ht ml

A collapse of Cumbre Vieja will not generate waves of up to 50 m. in height in Florida and the Caribbean islands, or more than 40 m along the northern coast of Brazil, ... Proper modeling of dispersive effects (Mader 2001) - provides much more realistic far-field wave estimates, in the unlikely event of a large-scale, La Palma slope failure. Mader's model of a La Palma slide estimates that the east coast of the U.S. and the Caribbean would receive tsunami waves of less than 3 meters and the European and African coasts would receive waves less than 10 meters high. However, this represents the upper limit. Full Navier-Stokes modeling brings the maximum expected tsunami wave amplitude off the U.S. east coast to about one meter. Even with shoaling effects, a tsunami from a La Palma slide would still be of concern but does not present an unmanageable threat or a significant far field hazard.

That's a three foot wave hitting the U.S. Eastern seaboard after a worst case collapse at La Palma. The paper is very detailed and worth a read.

What about Krakatau?

A series of large tsunami waves generated by the main explosion, some reaching a height of nearly 40 meters (more than 120 feet) above sea level, killed more than 36,000 people in the coastal towns and villages along the Sunda Strait on Java and Sumatra islands. Tsunami waves were recorded or observed throughout the Indian Ocean, the Pacific Ocean, the American West Coast, South America, and even as far away as the English Channel.
http://www.drgeorgepc.com/Vocano1883Krakatoa.html

Fine ashes from the eruption were carried by upper level winds as far away as New York City. The explosion was heard more than 3000 miles away. Volcanic dust blew into the upper atmosphere affecting incoming solar radiation and the earth's weather for several years.

Interestingly, a 1975 earthquake in China was successfully predicted due in large part to strange animal behavior. A large number of lives were saved.

Needless to say, this is an extreme exception to the rule, and is about as reliable as grandma's old bones are at predicting the weather.