Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Seismic Waves

Skip navigational links
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 05:00 - 06:15 (01:15)
Source: Annenberg/CPB Resources - Earth Revealed 26. Living With Earth, Part II
Keywords: "Stephen Scott", "seismic wave", oil, "Vibra-seis truck", drilling, "electronic receiver", geophone, "reflection seismogram", subsurface, image

Our transcription: Seismic waves are artificially generated above potential oil-bearing rocks.
We have a truck called a Vibra-seis truck that actually shakes the ground.
The Vibra-seis truck would shake the ground in an up and down fashion much like a jackhammer on a construction site shakes the ground.
We may drill a hole 5-foot or 200-foot down into the ground and load it with 5 to 20 pounds of dynamite and set dynamite off creating that shock wave that we need.
These shock waves are detected by electronic receivers known as "geophones."
The geophones are laid out in a line or a grid pattern over the area to be mapped.
The information recorded by the geophones is processed by a computer which, in turn, generates a reflection seismogram.
And what you see on this reflection seismogram is a series of reflections.
And those are occurring where that source that goes down through the Earth, that shock-wave, bounces off of the subsurface rocks and comes back to the surface and is recorded at the geophones.
So we see images of the subsurface.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:28:00 PDT 2013  (chd)