Difference between seismic refraction survey and tomography

Geophysical applications on environmental investigation, mineral prospecting, engineering, archaeology, forensics, hydrology...
resour
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Re: Difference between seismic refraction survey and tomography

Post by resour »

hasnabouftou wrote:
Tue Jul 17, 2018 2:23 pm

hello.
please can you help me, I am using Seisimager2D and in the field wa have done several profiel with 12 geophones and 15 shots and we have done in overlapping between the profiles but sense I am only using seisimager2D lite it provide only inversion with 12 shotsand i and I need a software that can correlate betwen the profiles
You can use our Rayfract(R) free trial. This expires after 30 days and assumes flat topography, max. 30 shots per profile database. For installer see

http://rayfract.com/trial/RAYTRIAL.EXE

We support importing multiple SeisImager/PlotRefa .VS files for shots recorded with overlapping receiver spreads. See

http://rayfract.com/help/overlap.pdf and

https://trace.tennessee.edu/utk_gradthes/1287/

for a project where they picked traces in Geometrics SeisImager PickWin and then imported first breaks and geometry into a Rayfract(R) profile.

For our .pdf reference see

http://rayfract.com/help/rayfract.pdf

pitta
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Re: Difference between seismic refraction survey and tomography

Post by pitta »

You could also try the demo of smartTomo, a new refraction tomography software.
The demo can be downloaded from this page:
https://www.smarttomo.com/wp/news/download-demo/


If you would try a refraction software you could download smartRefract, an open source GPL software from https://www.vs30.it/wp/en/category/sof ... fract-en/
or get the source from the repo:
https://bitbucket.org/pitta1981/smartrefract/

colby65
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Re: Difference between seismic refraction survey and tomography

Post by colby65 »

The seismic refraction method uses P- and S-wave energy to map vertical and lateral subsurface changes. A hammer blow or explosive charge (the shot) generates a shock wave that travels through the ground which is refracted along material boundaries, and is then received at the surface by sensors (geophones). Refraction interfaces correlate with real world boundaries in the ground, such as soil to bedrock boundaries.

Seismic Refraction Tomography is performed on soil and rock sites to generate 2D or 3D compression or shear wave velocity profiles. These velocity profiles can be used to estimate vertical and lateral variations in soil properties as well as the depth to, shape of and physical properties of bedrock. Common uses include estimations of depth to and rippability of bedrock, locations of paleochannels, mapping of hypothesized faults, and mapping slide planes of active landslides. Additionally, P-wave refraction can be combined with Multi-channel Analysis of Surface Waves (MASW) to estimate elastic constants including Poisson’s Ratio and Young’s modulus.

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