Baisch, S., Bokelmann, G.H.R., 1999, Spectral analysis with incomplete
time series: An example from seismology, Computers & Geosciences,
25,7, 739-750
A method for spectral analysis of nonequidistantly spaced time series is presented:
the Clean algorithm performs an iterative deconvolution of the spectral window in the
frequency domain. We demonstrate the capability of the method on synthetic data examples
and apply CLEAN to seismological ata, in an example where we seek temporal changes in
elastic wave velocities. The observed periodic changes of phase differences consist
of frequencies, which in principle may be explained by the influence of solid Earth tides,
but also by other effects with similar periodicity. Only CLEAN enabled us to enlarge
the time window over missihg data segments until the frequency resolution was accurate
enough to rule out solid Earth tides as cause for the observed periodic changes.
A MATLAB version of the CLEAN algorithm is available from the authors, or from the
IAMG server.
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