Seismic Refraction Measurements of Crustal Structure in West Antarctica

  1. Garry D. Mckenzie
  1. Sean T. Rooney,
  2. Donald D. Blankenship and
  3. Charles R. Bentley

Published Online: 21 MAR 2013

DOI: 10.1029/GM040p0001

Gondwana Six: Structure, Tectonics, and Geophysics

Gondwana Six: Structure, Tectonics, and Geophysics

How to Cite

Rooney, S. T., Blankenship, D. D. and Bentley, C. R. (1987) Seismic Refraction Measurements of Crustal Structure in West Antarctica, in Gondwana Six: Structure, Tectonics, and Geophysics (ed G. D. Mckenzie), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM040p0001

Author Information

  1. Geophysical And Polar Research Center, University Of Wisconsin-Madison, Madison, Wisconsin 53706

Publication History

  1. Published Online: 21 MAR 2013
  2. Published Print: 1 JAN 1987

ISBN Information

Print ISBN: 9780875900643

Online ISBN: 9781118664483

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Keywords:

  • Gondwana(Geology)—Congresses;
  • Geology,Structural—Congresses

Summary

Two seismic refraction profiles yield new information about the crustal structure of West Antarctica. One profile on the Ross Ice Shelf grid northwest of Crary Ice Rise shows basement rock with a compressional wave velocity (vp) of 5.9±0.2 km s−1 underlying a layer of presumed sediment about 400 m thick. The irregular basement surface lies about 1.0 km below sea level and has an average apparent dip of 1° to the grid north. The second profile, on the Siple Coast, reveals 1 to 2 km of sediment overlying a basement (vp 5.4±0.2 km s−1) that has an apparent dip of 4° to the grid southeast. An abrupt 2-km decrease in depth to basement within the profile is interpreted as being due to faulting. Deep reflections were observed on one record at 50 km, but data are insufficient for identification of their source.