I’d recommend looking into NASA and other research on the electrical disturbances in the Ionosphere that have preceded and/or followed numerous large(5.0+) earthquakes and tsunami’s.

“Early warning

One study looked at over 100 earthquakes with magnitudes of 5.0 or larger in Taiwan over several decades. The researchers found that almost all of the earthquakes down to a depth of about 35km were preceded by distinct electrical disturbances in the ionosphere…”

http://news.bbc.co.uk/2/hi/7435324.stm

“A French satellite observed a dramatic increase in ultra low frequency radio waves over Haiti in the month before the M7.0 earthquake earlier this year.

…

Now Michael Athanasiou at the Technical University of Serres in Greece and a few buddies say that DEMETER spotted good of evidence of a change in ultralow frequency radio waves in the ionosphere above Haiti in the run up to the quake. “The results reveal a significant increase of the energy of ULF waves, up to 360%, for a period of one month before the main earthquake compared with the energy of the background,” they say. That’s a dramatic increase. These emissions dropped gradually in the month after the quake.”

http://arxiv.org/abs/1012.1533