HR: 1340h
AN: GP33B-1252    [Abstracts]
TI: Comparison of 1- and 2-D Regularized MT Inversions
AU: * Medin, A E
EM: amedin@ucsd.edu
AF: Scripps Institution of Oceanograhpy, IGPP, UC San Diego, 9500 Gilman Dr, La Jolla, CA 92093-0225, United States
AU: Parker, R L
EM: rlparker@ucsd.edu
AF: Scripps Institution of Oceanograhpy, IGPP, UC San Diego, 9500 Gilman Dr, La Jolla, CA 92093-0225, United States
AB: We measure the success of a general numerical optimization scheme for solving the nonlinear inverse problem of electromagnetic induction (MT) in two dimensions by comparison with a one-dimensional analytic solution. The general, large-scale method treats the differential equations as constraints and the observations together with the 2-norm of the (positive) conductivity as a penalty function. The one-dimensional comparison problem is solved by means of the Euler-Lagrange equations with a positivity condition for a single frequency observation, but the solution can then be easily extended to many frequencies. Having exact analytic solutions for a simple system provides a valuable check on complex general-purpose codes.
DE: 1515 Geomagnetic induction
DE: 3260 Inverse theory
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2007 Fall Meeting