TY - JOUR
T1 - Rayleigh-wave group velocity distribution in the Antarctic region
AU - Kobayashi, Reiji
AU - Zhao, Dapeng
N1 - Funding Information:
We thank the researchers and technicians associated with the IRIS, GEOSCOPE, GTSN, GEOFON, MEDNET, PACIFIC21, National Institute of Polar Research, the Kaapvaal project, the SEPA project, and the SAPSE experiment for recording and managing the waveform data. We also thank IRIS DMS for providing the Wilber II interface, which is very convenient to use. The CRUST 2.0 and seafloor age data are taken from the Web site of G. Laske and R.D. Müller, respectively, with permission. The hotspot location data are compiled by T. Ono. T. Kubo, T. Tanimoto, M. Ritzwoller and an anonymous referee provided thoughtful comments which improved the manuscript. All figures are created by using the Generic Mapping Tools ( Wessel and Smith, 1991 ). This work was partially supported by a grant from the Japan Society for the Promotion of Science (Kiban-B No. 11440134).
Copyright:
Copyright 2004 Elsevier B.V., All rights reserved.
PY - 2004/3/16
Y1 - 2004/3/16
N2 - We determined 2D group velocity distribution of Rayleigh waves at periods of 20-150 s in the Antarctic region using a tomographic inversion technique. The data are recorded by both permanent networks and temporary arrays. In East Antarctica the velocities are high at periods of 90-150 s, suggesting that the root of East Antarctica is very deep. The velocities in West Antarctica are low at all periods, which may be related to the volcanic activity and the West Antarctic Rift System. Low velocity anomalies appear at periods of 40-140 s along the Southeastern Indian Ridge and the western part of the Pacific Antarctic Ridge. The velocities are only slightly low around the Atlantic Indian Ridge, Southwestern Indian Ridge, and the eastern part of the Pacific Antarctic Ridge, where the spreading rates are small. Around two hotspots, the Mount Erebus and Balleny Islands, the velocity is low at periods of 50-150 s.
AB - We determined 2D group velocity distribution of Rayleigh waves at periods of 20-150 s in the Antarctic region using a tomographic inversion technique. The data are recorded by both permanent networks and temporary arrays. In East Antarctica the velocities are high at periods of 90-150 s, suggesting that the root of East Antarctica is very deep. The velocities in West Antarctica are low at all periods, which may be related to the volcanic activity and the West Antarctic Rift System. Low velocity anomalies appear at periods of 40-140 s along the Southeastern Indian Ridge and the western part of the Pacific Antarctic Ridge. The velocities are only slightly low around the Atlantic Indian Ridge, Southwestern Indian Ridge, and the eastern part of the Pacific Antarctic Ridge, where the spreading rates are small. Around two hotspots, the Mount Erebus and Balleny Islands, the velocity is low at periods of 50-150 s.
KW - Antarctica
KW - Group velocity
KW - Rayleigh waves
KW - Tomography
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U2 - 10.1016/j.pepi.2003.11.011
DO - 10.1016/j.pepi.2003.11.011
M3 - Article
AN - SCOPUS:1642529022
VL - 141
SP - 167
EP - 181
JO - Physics of the Earth and Planetary Interiors
JF - Physics of the Earth and Planetary Interiors
SN - 0031-9201
IS - 3
ER -