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National Geophysical Data Center

Great Lakes-Project GLIMPCE
USGS Open File Report 88-401

Data Announcement 88-MGG-07

     Eight seismic-reflection profiles (24- to 30-fold) across the midcontinent rift system in Lake Superior, Lake Huron, and Lake Michigan are now available for purchase from the National Geophysical Data Center (NGDC). The profiles were collected in September 1986 by the U.S. Geological Survey (USGS) and the Geological Survey of Canada under contract as part of the Great Lakes International Multidisciplinary Program on Crustal Evolution (GLIMPCE). The USGS has provided these data to NGDC for public dissemination.

     During the seismic reflection survey, 120-channel data were recorded to 20 sec at a 4-ms sample rate. The system utilized a 3,200-m streamer configured with a 70-airgun tuned array, and had a capacity of 7,800 The data were processed and F-K migrated using a standard processing sequence that included deconvolution before and after stack and dip filtering in the shot domain to suppress multiple reflections. Primary navigation was by satellite, sonar, and gyro. Secondary navigation included Loran C and range/range. The horizontal scale of the sections is 1 in. = 1250 m with a vertical scale of 1.5"/sec.

* Behrendt, John C., and Green, Alan**, "GLIMPCE 1986 Multichannel Seismic-Reflection Profiles in the Great Lakes", U.S. Geological Survey Open-File Report 88-401, Denver, CO 80225.

** Geological Survey of Canada, Ottawa, Canada KIA OE8

DATA AVAILABLE (please refer to 9-digit product numbers when ordering).

8 seismic profiles (24 to 30 fold) 8 sections
      (plastic sepia) Product #976F20165
      (paper sepia) Product #976F19165
      (blackline) Product #976F18165

11 Trackline Charts (scale: 1:250,000)
      (plastic sepia) Product #976A20265
      (paper sepia) Product #976A19165
      (blackline) Product #976A18165

8 stacked magnetic tapes (SEG-Y 6250 bpi). Product #976L07165.

1 magnetic tape - bathymetry and digital shot-point navigation (9- track, 1600 bpi, ASCII). Product #976H07165. This is also available on CD-ROM, Product #129F27001.

Please contact NGDC for prices.