Seismic Refraction Measurements of Crustal Structure in West Antarctica
- Garry D. Mckenzie
Published Online: 21 MAR 2013
Copyright 1987 by the American Geophysical Union.
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
- Published Online: 21 MAR 2013
- Published Print: 1 JAN 1987
Print ISBN: 9780875900643
Online ISBN: 9781118664483
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.