Taken from "Earthquakes" by Kaye Shedlock and Louis C. Pakiser

Seismology is the study of earthquakes and the Earth using seismic waves. From recordings of earthquake-generated waves, information about the earthquake source may be derived, including its magnitude, location, time of occurrence, depth, and its orientation and movement on the fault. Further analysis provides information about the stresses on the faults and structure of the portion of the Earth through which the waves traveled. Teleseismic waves (waves coming from distant earthquakes) provide information about the entire Earth structure (crust, mantle and core). Deep earthquakes provide information about sub-crustal (uppermost mantle) structure, while shallow earthquakes provide detailed information about the faults in and structure of the crust. Seismic waves generated by controlled explosions are used to image the Earth's crustal structure. The related field of strong motion seismology uses waves from large earthquakes to study the earthquake source in detail, predict the strength of future shaking, establish safer building codes and improve seismic engineering design.

Earthquakes
General introduction, with nice photos. By Kaye M. Shedlock and Louis C Pakiser.

Earthquake Terminology
Glossary of terms related to earthquakes.

The Richter Scale
The size of an earthquake is measured by several methods based on different kinds of measurements. In 1935, Charles Richter introduced a method based on the amplitude of seismic waves.

The Modified Mercalli Scale
While the Richter Scale describes the size of the earthquake, the Modified Mercalli Scale describes the intensity of shaking and degree of damage at locations affected by it.

Other Earthquake Magnitude Scales
Including the Local Magnitude Scale and Moment Magnitude Scale.

The San Andreas Fault
General introduction to the fault, its geologic setting and the earthquakes on it, with nice photos. By Sandra S. Schulz and Robert E. Wallace.

Earthquake Probability Study for San Francisco Bay Region
A regional model that attempts to unify plate motions, geology and historic earthquake activity toward the aim of estimating long-term probabilities for large earthquakes in the region.

Listening to Earthquakes
Educational and entertaining exploration of the parallel between earthquake waves and audible sound. "Listen" to actual earthquake seismograms speeded up to audible frequencies. Uses .wav format, which you can download.

Seismology in the Science Fair
Examples of seismological science fair projects, and links to help you do you own.

Recent and Significant Past Earthquakes
List of webpages containing reports, damage photos, and geologic photos of recent earthquakes from around the globe.

Earthquake History: California, Nevada, Baja California
A list of all significant earthquakes in California, Nevada, Baja California since 1769.

The Great San Francisco Earthquake (1906)
Information about the M 7.8 earthquake that occurred on the San Andreas fault.

Loma Prieta Earthquake 10th Anniversary Review
A review of scientific progress that has resulted from studies of the 1989 earthquake in the San Francisco Bay Region.

USGS Scientific Expedition: Earthquake in Turkey - 1999
Scientists and engineers from the U.S. Geological Survey departed for the epicentral region on August 19, 1999, less than 2 days after the quake occurred, to join in an international scientific effort that will deploy seismic and geodetic instruments, make geologic field measurements and assess and record the structural damage.