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Did you know?

The Dead Sea is so salty that it kills most animal and plant life, but bacteria, brine shrimp, and a class of plants called halophytes that love salt water thrive there.



Instruments \ Seismic \ 
Seismic Items

Subsurface formations are mapped by measuring the times required for a seismic wave (or pulse), generated in the earth by a near-surface explosion of dynamite, mechanical impact, or vibration, to return to the surface after reflection from interfaces between formations having different physical properties. The reflections are recorded by detecting instruments responsive to ground motion. They are laid along the ground at distances from the shot point which are generally small compared with the depth of the reflector.

Variations in the reflection times from place to place on the surface usually indicate structural features in the strata below. Depths to reflecting interfaces can be determined from the times using velocity information that can be be obtained either from the reflected signals themselves or from surveys in wells. Reflections from depths as great as 20,000 ft can normally be observed from a single explosion, so that in most areas geologic structure can be determined throughout the sedimentary section.


Sub-categories
Acquisition Methodology

Amplifiers

Data Processing and Interpretation

Geophones

Hydrophones

Miscellaneous

Oscillographs

Seismic Streamers

Seismographs

Seismometers

Sound Sources

Survey Equipment

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Last Updated: 2/9/2006
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This web page and accompanying pages are not maintained by the SEG Business Office staff nor by Missouri Southern State University. SEG nor MSSU do not necessarily endorse or concur with representations made on these pages and have no responsibility for the content. Comments and concerns should be referred to the webmaster, John Knapp, member of SEG Geoscience Center Committee.