HR: 0800h
AN: S51E-1058    [Abstracts]
TI: Surface Wave Tomography of North American Arctic
AU: * McCoy, C O
EM: mccoyc@colorado.edu
AF: Center for Imaging of the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309 United States
AU: Levshin, A L
EM: levshin@colorado.edu
AF: Center for Imaging of the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309 United States
AU: Anderson, D K
EM: deweya@colorado.edu
AF: Center for Imaging of the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309 United States
AU: Ritzwoller, M H
EM: ritzwoller@colorado.edu
AF: Center for Imaging of the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309 United States
AU: Shapiro, N M
EM: nshapiro@colorado.edu
AF: Center for Imaging of the Earth's Interior, Department of Physics, University of Colorado at Boulder, Campus Box 390, Boulder, CO 80309 United States
AB: The spatial and vertical resolution of existing 3-D images of the North American Arctic crust and upper mantle is relatively poor due to the coarse network of seismic stations in the region. Recent deployments of several temporary seismic arrays (e.g. PASSCAL, POLARIS) as well as access to data from the Canadian National Seismic Network open new opportunities for improving models of lithospheric structure of this region. We present the results of surface wave group velocity tomography of the North American Arctic between 50-170W and 50-90N. Measurements were obtained on more than 5000 paths for Rayleigh waves and 2000 paths for Love waves and are added to an existing data base of group velocities for the region (e.g., Levshin et al., PEPI, 123, 185, 2001) to provide group velocities between 15 and 150 sec period. The two-stage Monte Carlo inversion of these measurements (Shapiro and Ritzwoller, GJI, 151, 88, 2002) into 2D-tomographic group velocity maps followed by a 3D-shear velocity model of the crust and upper mantle provides new, more highly detailed images of the lithospheric structure of the region.
DE: 7218 Lithosphere (1236)
DE: 7255 Surface waves and free oscillations
DE: 7270 Tomography (6982, 8180)
SC: Seismology [S]
MN: Fall Meeting 2005