Model Estimations Biased by Truncated Expansions: Possible Artifacts in Seismic Tomography

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Science  01 Mar 1996:
Vol. 271, Issue 5253, pp. 1257-1260
DOI: 10.1126/science.271.5253.1257


In most linear imaging problems, where the model to be sought is expanded in a set of basis functions, it is common practice to truncate the set at a certain (arbitrary) level. The solution then depends on the chosen parameterization, and neglected basis functions may leak into the solution to produce artifacts in the retrieved model. An unbiased estimate of the coefficients of the true model may be obtained in the chosen finite basis set; here, a method to suppress leakage is illustrated on an example of global seismic tomography.