Mathematics – Logic
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984geoj...76..697w&link_type=abstract
Geophysical Journal (ISSN 0016-8009), vol. 76, March 1984, p. 697-723. Sponsorship: U.S. Geological Survey.
Mathematics
Logic
105
Earth Mantle, Earth Planetary Structure, Gulf Of California (Mexico), Mathematical Models, P Waves, Seismology, Data Acquisition, Data Processing, Earthquakes, Propagation Velocity, Pulse Amplitude, Wave Propagation, Waveforms
Scientific paper
Over 1400 seismograms of earthquakes in Mexico are analyzed and data sets for the travel time, apparent phase velocity, and relative amplitude information are utilized to produce a tightly constrained, detailed model for depths to 900 km beneath an active oceanic ridge region, the Gulf of California. The data are combined by first inverting the travel times, perturbing that model to fit the p-delta data, and then performing trial and error synthetic seismogram modelling to fit the short-period waveforms. The final model satisfies all three data sets. The ridge model is similar to existing upper mantle models for shield, tectonic-continental, and arc-trench regimes below 400 km, but differs significantly in the upper 350 km. Ridge model velocities are very low in this depth range; the model 'catches up' with the others with a very large velocity gradient from 225 to 390 km.
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