Here are something interesting links for the earthquake fanatic:
Nor Cal USGS
Real Time Earthquake Maps (California-Nevada)
Real-time Shaking Maps for California earthquakes of Magnitude 3.5 and larger
1906 San Francisco Earthquake ShakeMaps
Earthquake Probabilities for the San Francisco Bay Area
USGS and other scientists conclude that there is a 62% probability of at least one magnitude 6.7 or greater quake, capable of causing widespread damage, striking the San Francisco Bay region before 2032.
General Quake Info
Earthquake basics and educational material; geological and historical information; links to professional and amateur organizations; online access to earthquake data.
Hazards …

Magnitude 9 quakes are generally caused by subduction events. There are 40,000 km of subduction boundaries around the Pan Pacific Rim. Seismologists have been studying these subduction zones to identify high risk areas for high mag quakes. Why? A mag 9.0 quake caused the 2004 tsunami in Indonesia, killing over 300K.
Earthquake science utilizes all sorts of data, earth temperature, geologic features, physics, even historical data. When you boil down the search for the next big one, we always end up at a question of probability.
Looking at all this …

Tokyo and the Kanto Plain lie above the convergence of 3 tetonic plates. Luckily, only 30 million people live in that area.
A joint US-Tokyo research team recently tackled the likelihood of a severe shaking incident around Tokyo (not including the unnatural shaking from a Godzilla attack). They found a two pronged issue, offshore earthquakes and below ground quakes.
A offshore magnitude 8 quake in 1923 killed 105,000 people. The focus was on a recurrence of a large offshore quake. By dating terraces perched above the shore, they found that …