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During the 1993/94 austral summer, the U.S. Geological Survey recorded wide-angle refraction data along three east-west, deep-crustal transects in the Ross Sea region as part of an international project One transect was across the Transantarctic Mountains extending about 230 km along latitude 76 degrees South. Fifty three seismic stations were deployed and four shooting locations were used. The other two transects were in the southern Ross Sea, and extended back-to-back for 650 km along latitude 77 degrees 6 minutes South, starting at a point directly north of Ross Island. Fifty-six ocean-bottom seismometers were deployed, and a seismic source of 71 liters was fired every 240 meters along the combined transect. Data from the three transects are now being digitized and analyzed. Initial interpretations from seismic stations should be available by mid1994. Good logistic and science cooperation between the U.S. and Italian Antarctic programs resulted in a highly successful field season.

Initial field report: U.S. Geological Survey participation in the 1993/94 Antarctic Crustal Profile (ACRUP) Seismic Project, Ross Sea area, Antarctica