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[[File:Refracted wave.png|thumb|Propagating seismic waves (bottom) and related travel time diagram (top) of the direct (blue) and the first refracted phase (green)]]
== Soldes Longchamps ==
'''Seismic refraction''' is a geophysical principle (see [[refraction]]) governed by [[Snell's Law]]. Used in the fields of [[engineering geology]], [[geotechnical engineering]] and [[exploration geophysics]], [[seismic refraction traverse]]s ([[seismic lines]]) are performed using a [[seismograph]](s) and/or [[geophone]](s), in an array and an energy source. The seismic refraction method utilizes the refraction of seismic waves on geologic layers and rock/soil units in order to characterize the subsurface geologic conditions and [[Structural geology|geologic structure]].


The methods depend on the fact that seismic waves have differing velocities in different types of soil (or rock): in addition, the waves are refracted when they cross the boundary between different types (or conditions) of soil or rock. The methods enable the general soil types and the approximate depth to strata boundaries, or to [[bedrock]], to be determined.
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==P-Wave Refraction (aka Compression Wave Refraction)==
 
P-wave refraction evaluates the [[compression wave]] generated by the seismic source located at a known distance from the array. The wave is generated by vertically striking a striker plate with a sledgehammer, shooting a seismic shotgun into the ground, or detonating an explosive charge in the ground. Since the compression wave is the fastest of the [[body waves|seismic waves]], it is sometimes referred to as the [[primary wave]] and is usually more-readily identifiable within the seismic recording as compared to the other seismic waves.
 
==S-Wave Refraction (aka Shear Wave Refraction)==
 
S-wave refraction evaluates the [[shear wave]] generated by the seismic source located at a known distance from the array. The wave is generated by horizontally striking an object on the ground surface to induce the shear wave. Since the shear wave is the second fastest wave, it is sometimes referred to as the [[secondary wave]]. When compared to the compression wave, the shear wave is approximately one-half (but may vary significantly from this estimate) the velocity depending on the medium.
 
== Two Horizontal Layers.==
[[File:refraction 2layers.png|800px|center|Two layers model.]]
 
i<sub>c<sub>0</sub></sub> - critical angle<br />
V<sub>0</sub> - velocity of the first layer<br />
V<sub>1</sub> - velocity of the second layer<br />
h<sub>0</sub> - thickness of the first layer<br />
T0<sub>1</sub> - intercept<br />
<br />
:<math>i_{c_{0}} = asin \left( {V_{0} \over V_{1}} \right) </math>
:<math> T = {2h_{0}cos(i_{c_{0}}) \over V_{0}} + {X \over V_{1}} = T0_{1} + {X \over V_{1}}</math>
<br />
:<math> h_{0}= {T0_{1}V_{0} \over 2cos(i_{c}) }</math>
:<math> h_{0} = {X_{cross_{1}} \over 2} \sqrt{{V_{1}-V_{0} \over V_{1} + V_{0}}}</math>
 
== Several Horizontal Layers.==
<br />
:<math> h_{n} = {V_{n} \over cos(i_{n})} \left( {T0_{n+1} \over 2} - \sum_{j=0}^{n-1}{h_{j}\sqrt{{1 \over V_{j}^2} - {1 \over V_{j+1}^2}}} \right) </math>
 
==Inversion Methods==
 
* The General Reciprocal Method
* The Plus/Minus Method
* Refraction Inversion Modeling (Refraction Tomography)
* Monte Carlo simulation
* Genetic Algorithms
 
==See also==
* [[Reflection seismology]]
 
==References==
{{No footnotes|date=April 2009}}
* [http://www.usace.army.mil/publications/eng-manuals/em1110-1-1802/toc.htm US Army Corp of Engineers EM 1110-1-1802]
* [http://www.cflhd.gov/geoTechnical/ Central Federal Lands Highway Division]
 
[[Category:Geophysics]]
[[Category:Seismology and earthquake terminology]]

Latest revision as of 02:57, 6 December 2014

Soldes Longchamps

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