Refining seismic structure models by the systematic phase identification of late-arriving groups

Details Refining seismic structure models by the systematic phase identification of late-arriving groups Refining seismic structure models by the systematic phase identification of late-arriving groups

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.171.1135s&link_type=abstract

Geophysical Journal International, Volume 171, Issue 3, pp. 1135-1143.

Astronomy and Astrophysics

Astronomy

Inversion, Later Arrivals, Phase Identification, Seismic Structure

Scientific paper

We develop a systematic approach to the phase identification of late-arriving groups in 2-D seismic data. Waveforms in the same traveltime branch are grouped, and synthetic traveltimes for all phases are calculated using an initial approximation to the 2-D structure. For each group, we identify the two synthetic phases providing the smallest RMS residuals. If their ratio is less than some predetermined threshold, then the group's phase is ambiguous and both assignments must be tested by traveltime inversion. If there are n unidentified groups, we construct 2n phase tables and perform a traveltime inversion on every plausible phase assignment. The phase table that provides the highest value of the posterior probability density is taken as correct, and a 2-D velocity model is constructed from the data. This approach is shown to be effective and efficient on both simulated and real data. In addition, the residuals associated with late-arriving groups provide a means of identifying deficiencies in the initial model.

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