Technology to forecast earthquakes, volcanic activity

[hammertime]

I know that it's likely impossible to predict exactly when an earthquake will strike or when a volcano will erupt, but I was just wondering what technologies existed out there to at least forecast them and let people know that something is imminent.

Again, could remote or wireless sensing help? Sensor networks to monitor pressure and buildup? What are we doing to help forewarn of impending seismic activity?

[berkeman]

Here's some info from wikipedia:

http://en.wikipedia.org/wiki/Earthquake_prediction

.