Very powerful use of the web to get data out to the public fast. Good maps and access to technical information about the quake. Nice selection of data and access to many seismograms. NEIC Current Earthquake Maps - Quick links to regional and world maps with recent earthquakes posted on them. Or go to the NEIC Home page for all their info.
Subduction zones are the sites for most of the truly devastating earthquakes of the world.
This is one way geophysicists and geologists determine the type of plate tectonic setting for the earthquake. In this case, we're dealing with a subduction zone, but a very confusing one. Usually, there is a nice simple progression from shallow quakes to deep ones as the oceanic plate is subducted deeper and deeper into the mantle. The epicenter of Friday's quake is in an area where the only nearby deep quakes are to the south of the plate boundary, indicating subduction to the south here. This is a tricky area, in plate tectonics terms.