HR: 16:30h
AN: S44A-05    [Abstracts]
TI: Inversion of the Teleseismic P Coda for Lithospheric Structure: Examples From Ontario and California
AU: * Frederiksen, A W
EM: frederik@cc.umanitoba.ca
AF: University of Manitoba, Department of Geological Sciences University of Manitoba, Winnipeg, MB R3T 2N2 Canada
AU: Zhang, J
EM: umzhan60@cc.umanitoba.ca
AF: University of Manitoba, Department of Geological Sciences University of Manitoba, Winnipeg, MB R3T 2N2 Canada
AU: Revenaugh, J
EM: justinr@umn.edu
AF: University of Minnesota, Department of Geology and Geophysics University of Minnesota 310 Pillsbury Drive SE, Minneapolis, MN 55455-0219 United States
AB: The coda of the teleseismic P wave has become one of the most powerful tools for unravelling fine-scale receiver-side structure, using both single stations and sparse or dense arrays of seismometers. Determining structural information from the coda is an inverse problem that may be treated using either linear or nonlinear methods, depending on what ad hoc assumptions are made about the nature of the coda waves and the structures that generate them. We will review some of the principal methods used in coda imaging and inversion, and examine two methods in greater detail: a non-linear search algorithm applied to single-station data in the presence of anisotropy and dip, and a linearized tomographic inversion of scattered-wave energy in the coda. Examples of applying these methods to detect thinly laminated mantle anisotropy beneath southern Ontario and features correlated with seismicity in California will be given.
DE: 7203 Body wave propagation
DE: 7205 Continental crust (1242)
DE: 7218 Lithosphere and upper mantle
DE: 7294 Instruments and techniques
DE: 8180 Tomography
SC: Seismology [S]
MN: 2005 Joint Assembly