Physics
Scientific paper
Feb 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3303303l&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 3, CiteID L03303
Physics
6
Physical Properties Of Rocks: Thermal Properties, Physical Properties Of Rocks: Wave Attenuation, Seismology: Body Waves, Seismology: Lithosphere (1236), Geographic Location: Antarctica (4207)
Scientific paper
This study examines teleseismic S-wave attenuation variations between the Ross Sea in West Antarctica and Vostok Subglacial Highlands in East Antarctica. These analyses indicate that δt* is ~1 second greater beneath the Ross Sea than East Antarctica, with the transition occurring beneath the Transantarctic Mountains. While the structure is non-unique, low attenuation beneath East Antarctica is consistent with thick subcontinental lithosphere (>=250 km) and negligible asthenosphere. In contrast, the Ross Sea possesses a thin lithosphere underlain by thick, highly anelastic asthenosphere. Independent temperature estimates from velocity and quality factor indicate that the mantle is 200-400°C colder beneath East Antarctica than the Ross Sea between 80 and 220 km depth. The temperature variation beneath the Transantarctic Mountains may have assisted in the asymmetric uplift of the mountains. Attenuation and velocity anomalies within East Antarctica may delineate regions of elevated temperature, representing recently modified sections between older lithospheric blocks.
Anandakrishan Sridhar
Lawrence Jesse F.
Nyblade Andrew A.
Shore Patrick J.
Voigt Donald
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