- Experiment Name: A Broadband Seismic Investigation of Deep Continental
Structure Across the East-West Antarctic Boundary
- PI: Wiens, Anandakrishnan, Nyblade
- Email: sak@ua.edu
- Sponsor: NSF
- Inst: Wash U, UA, Penn S
- Start_Date: 10/1/2000, 10/1/2001
- End_Date: 10/1/2001, 3/31/2004
- Lat: -79.0
- Long: 132.5
- Chan6: 8, 47
- Broadband: 8, 47
- Descr: To examine details of the crust and upper mantle structure
across the East-West Antarctic boundary, we have designed a seismic
experiment comprised of three elements 1) A 1400 km linear array of
17 broadband seismic stations extending from the high central regions
of the East Antarctic craton to the Transantarctic mountains (Array
1) 2) An intersecting 400 km denser linear array of 16 broadband seismic
stations extending from the coast across the Transantarctic mountains
nearly perpendicular to the strike of the range in the dry valleys
region (Array 2). 3) 11 broadband stations in coastal regions around
Ross Island and Terranova Bay (Array 3). We propose to conduct this
experiment over a three year period beginning November, 2000. Data
will be analyzed using a variety of proven modeling techniques, including
body and surface wave tomography, receiver function inversion, and
shear wave splitting analysis. The results of these analyses will be
maps of the variation in crustal thickness, upper mantle structure,
anisotropy, and mantle discontinuity topography across the boundary
of East and West Antarctica. This experiment will represent the first
large-scale (tens of instruments) broadband seismic deployment in Antarctica,
and the results will provide a major step forward in our understanding
of the geodynamics of the Antarctic continent.
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