earthquake.usgs.gov

Definitions (189)

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# seismic gap

A seismic gap is a section of a fault that has produced earthquakes in the past but is now quiet. For some seismic gaps, no earthquakes have been observed historically, but it is believed that the fault segment is capable of producing earthquakes on some other basis, such as plate-motion information [..]
 Source: earthquake.usgs.gov

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# wavelength

The wavelength is the distance between successive points of equal amplitude and phase on a wave (for example, crest to crest or trough to trough).
 Source: earthquake.usgs.gov

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# subduction

Subduction is the process of the oceanic lithosphere colliding with and descending beneath the continental lithosphere.
 Source: earthquake.usgs.gov

# 4.

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The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core. Shadow Zone Fl [..]
 Source: earthquake.usgs.gov

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# seismic moment

The seismic moment is a measure of the size of an earthquake based on the area of fault rupture, the average amount of slip, and the force that was required to overcome the friction sticking the rocks together that were offset by faulting. Seismic moment can also be calculated from the amplitude spe [..]
 Source: earthquake.usgs.gov

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# segmentation

Segmentation is the breaking up of a fault along its length into several smaller faults. This can happen as a result of other faults crossing it, topography changes, or bends in the strike of the faults. Segmentation can limit the length of faulting in a single earthquake to some fraction of the tot [..]
 Source: earthquake.usgs.gov

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# mantle

The mantle is the part of the earth's interior between the metallic outer core and the crust.
 Source: earthquake.usgs.gov

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# active fault

A fault that is likely to have another earthquake sometime in the future. Faults are commonly considered to be active if they have moved one or more times in the last 10,000 years.
 Source: earthquake.usgs.gov

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# YBP

YBP is an abbreviation for "years before present".
 Source: earthquake.usgs.gov

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# wavefront

The wave front is the instantaneous boundary between the seismic waves in the earth material, and the material that the seismic energy has not yet reached. Wavefront Flash Animation
 Source: earthquake.usgs.gov