National Geophysical Data Center
MULTICHANNEL SEISMIC-REFLECTION DATA
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 cu.in. 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.
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