Crustal thickness estimation using high frequency Rayleigh waves

Details Crustal thickness estimation using high frequency Rayleigh waves Crustal thickness estimation using high frequency Rayleigh waves

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995georl..22..539d&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 22, no. 5, p. 539-542

Physics

11

Earth Crust, Estimating, High Frequencies, Rayleigh Waves, S Waves, Seismology, Thickness, California, Earthquakes, Nevada, Optimization, Seismographs, Waveforms

Scientific paper

The method of nonlinear waveform-fitting was extended to include changes in the depth of the Moho. Studies performed on synthetic data at 10 deg epicentral distance showed that it is theoretically possible to determine Moho-depth with an accuracy of less than a kilometer if the frequency range extends to 0.12 Hz. We applied this method on several broadband records from two earthquakes in the western United States to invert for crustal thickness. Waveform-fitting of Rayleigh waves for epicentral distances between 3 deg and 10 deg for individual paths in this region show that the average Moho-depth can be resolved to 1-2 km. It was possible to obtain good waveform fits for frequencies between 0.02-0.08 Hz. We conlude that broadband seismic data from local events allow us to determine Moho-depth independently from crustal shear-wave velocity.

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