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Shear‐wave velocities under the Transantarctic Mountains and terror rift from surface wave inversion
Author(s) -
Bannister S.,
Snieder R. K.,
Passier M. L.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010866
Subject(s) - geology , rift , inversion (geology) , seismology , rayleigh wave , shear (geology) , surface wave , mantle (geology) , geophysics , geodesy , tectonics , paleontology , computer science , telecommunications
Rayleigh wave data between 20 and 120s period recorded in the western Ross Sea region of Antarctica are inverted using the waveform inversion technique described in Passier and Snieder [1995]. From the data we extract estimates of local S velocity structure beneath the Transantarctic Mountains and the Terror Rift. The shear wave velocities found are up to 6% slower than the PREM model at between 40 and 160 km depth, depending on the propagation path, providing evidence of an anomalously warm upper mantle beneath the Terror Rift and, to a lesser extent, beneath the front of the Transantarctic Mountains.