Expanded Capabilities for Geode Seismograph
Applications now include sub-bottom profiling, continuous recording

The Geode seismograph was intended to be a multi-purpose tool for collecting seismic data, but the features requested by some of our customers have turned it into an instrument for, well, what's your application? Some examples:
  • Seismic monitoring 24 hours a day, 7 days a week, David DeMartini, Shell Exploration and Production
  • Uphole surveys, Yvon Kerroux, CGG
  • Steam front movement in 4-D seismic surveys over heavy oil deposits, Doug Schmitt, University of Alberta
  • Laboratory recording tool, Masahiro Kamata, Schlumberger
  • Sub-bottom profiling, Jon Tunnicliffe, University of British Columbia
  • Gun-boat signature recording, Colin Johnson, WesternGeco
  • Landslide monitoring, Alan Green and Hansreudi Maurer, ETH Switzerland
  • Continuous vehicle monitoring, Mark Moran, U.S Army Corps of Engineers
  • Seismo-electric effect measurements, Karl Butler, University of New Brunswick
  • Sea bottom seismic surveys,Wim Versteeg, University of Ghent
  • Forensic studies, Alan Witten, University of Oklahoma
  • High-amplitude explosions to simulate earthquakes, Bob Nigbor, USC
  • High-resolution reflection in urban areas, Rob Williams, U.S.G.S. Denver

Hansreudi Maurer and Alan Green use Geodes to monitor mountaintop landslides.  A solar-powered telemetry link sends data to a nearby town.

Time-lapse seismic section over heavy-oil deposit collected with Geode seismic system. High-speed, built-in correlators make this kind of survey practical. Data and article contributed by Doug Schmitt, University of Alberta

These diverse applications are possible because of an architecture that supports several different recording styles. Data are temporarily stored in a circular buffer after being recorded continuously at a 20 µsec sample interval. Data can be synchronized to an event (like a shot or sweep), a time base (like a GPS clock), or to an internal self-trigger generated by an event in the data. Signal quality is improved by decimation and conditioning by a digital signal processing (DSP) chip running a proprietary Geometrics algorithm. Data are then transferred as continuous files for real-time monitoring, cut into short, closely spaced records if doing marine high-resolution sub-bottom profiling, or into longer files for more traditional reflection, refraction, VSP or tomography surveys.

Geodes can be operated in series to build up to 1,024-channel systems or run in parallel for even faster cycle times.

Jon Tunnicliffe and Mike Church use Geodes in sub-bottom profile mode to image the bottom of Chilliwack Lake

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