earthquake.usgs.gov

Website:http://earthquake.usgs.gov
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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 fau [..]
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

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shadow zone


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 stopp [..]
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 [..]
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 faul [..]
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


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