Shear-wave velocities under the Transantarctic Mountains and Terror rift from surface wave inversion

• Main Authors: S. Bannister, R. K. Snieder
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Published: 2000
• Subjects: Ross Sea; Transantarctic Mountains; Antarc*; Antarctica
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.503.1579; http://inside.mines.edu/~rsnieder/grl00.pdf

Abstract. Rayleigh wave data between 20 and 120s period recorded in the western Ross Sea region of Antarctica are in-verted using the waveform inversion technique described in Passier and Snieder [1995]. From the data we extract esti-mates of local S velocity structure beneath the Transantarc-tic 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.