This site provides access to Community Internet Intensity Maps (CIIM), made from citizen reports of ground shaking following significant earthquakes. CIIMs are available for the 50 United States and territories, as well as for some significant events outside the U.S. Intensity maps are also available for some historic earthquakes. There is also information on fast moment tensor solutions, PAGER (Prompt ... Full description.

This site contains information about the general model geologists have developed to explain how most mountain ranges form. This model suggests that mountain building involves three stages, which are accumulation of sediments, an orogenic period of rock deformation and crustal uplift, and a period of crustal uplift caused by isostatic rebound and block-faulting. The later two stages of this model involve ... Full description.

This glossary of earthquake terms features illustrations which accompany the definitions, where possible, to provide examples and additional reinforcement. Links to related terms are embedded in the text. Full description.

This table presents the modified Mercalli Intensity Scale (MMI), a measure of earthquake intensity based on shaking severity and observed effects of earthquakes. It includes MMI value, a description of shaking severity, and a summary and full description of damage effects. Each MMI value is accompanied by an illustration showing its expected effects. Full description.

This table provides information on all earthquakes in the California-Nevada area, as shown on the U.S. Geological Survey's real-time earthquake map. The table consists of all earthquakes cataloged in the last week (168 hours). The top three magnitude categories above magnitude 3 are in highlighted in red. Information provided includes magnitude, date and time, latitude and longitude, depth, and location. ... Full description.

This interactive map shows the locations of all earthquakes in the California-Nevada area for the past week. The map is subdivided into 2x2 degree sheets that can be accessed by clicking on the desired area. Locations of major fault systems are shown, and earthquake locations are color-coded to indicate whether they occurred in the past hour, day, or week. The magnitude of each earthquake is keyed ... Full description.

This collection of video clips from the Caltech Woodframe Project shows what happens to a wood-frame house when it is shaken in the laboratory under conditions resembling those of an earthquake. There are both interior and exterior views, and also tests with furnishings in the house. The videos are available in two formats. There are also links to a description of the project, objectives of the testing, ... Full description.

This isoseismal map shows shows regions of different intensities according to the Modified Mercalli Intensity Scale. These zones were defined using the felt reports from the Charlevoix-Kamouraska earthquake of February 1925, which occurred in central Quebec, Canada. Full description.

This isoseismal map shows the distribution of Modified Mercalli values compiled from questionnaires distributed after the largest shock of the January 1988 Tennant Creek earthquake, which occurred in Northern Territory, Australia. Full description.

In this exercise, students will study the three types of faults, investigate the association between faults and earthquakes, and examine the relationship between earthquakes and plate tectonics. There is a set of animations that illustrate the types of seismic waves, an exercise in which students determine the location of an earthquake epicenter using arrival times of P and S waves, and an exercise ... Full description.