The big geology news this morning is the 8.9 magnitude earthquake off Honshu, Japan. Since it struck during the day on Friday (Japan time), there are going to be a lot of impressive images and videos coming through over the next few days (who in Japan doesn't have a camera phone?).
Earthquakes as subduction zones can be very large and destructive. The aftershocks from this earthquake are impressive, as of 10 am EST (1500 UTC) on Friday, March 11, I count 15 aftershocks of greater than magnitude 6 (those are all large earthquakes in their own right) and literally dozens from magnitude 5 - 6 (and many, many more smaller magnitude shocks).
See the National Earthquake Information Center (NEIC) for a real-time list of earthquakes around the world over the past week.
The seismic data for this earthquake shows thrusting and displacement of the seafloor. This movement of the seaflor can result in a long-wavelength wave which can travel across the entire Pacific Basin - a tsunami when it reaches shorelines. While coastal Japan experienced a significant tsunami, still waiting to hear about Hawaii and western North America.