Other ID: GL86
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Lake Superior, Great Lakes, United States, Canada, North America;
Principal Investigator(s): Anne M. Trehu
Information Specialist(s): Anne M. Trehu
Data Type(s): Seismics: Ocean Bottom Seismometer, Sonar: Single Beam, Location-Elevation: Navigation
Scientific Purpose/Goals: This course was part of a large-scale effort by the U.S. Geological Survey and the Geological Survey of Canada to image the deep crustal structure of the Great Lakes region. This report covers the operations of the ocean bottom seismometers (OBSes), which were deployed along a line across Lake Superior to record large-offset seismic data from a series of shots generated by a commercial contract vessel.
Start Date: 1986-08-30
Start Port/Location: Sault Ste. Marie, MI
End Date: 1986-09-05
End Port/Location: Sault Ste. Marie, MI
Equipment Used: Ocean Bottom Seismometer, Echosounder, Loran-C
Information to be Derived:
Summary of Activity and Data Gathered: During the first leg, instruments were deployed at each of five stations occupied and ranges were measured acoustically from 4-5 points around the deployment site. Instruments were retrieved during the second leg. Preliminary plots of record sections indicate that the data are of excellent quality. Good signal-to-noise ratios were obtained out to the largest offsets recorded (185 km).
Staff: Anne M. Trehu, Gregory Miller
Notes: Cruise included two legs: Leg 1, 8/30-9/02 - leave Sault Ste. Marie, MI and arrive Marquette, MI; Leg 2, 9/03-9/05 - leave Marquette, MI and arrive Sault Ste. Marie, MI.