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Frequency-Dependent Crustal Correction for Finite-Frequency Seismic Tomography

¹ Graduate School of Oceanography
University of Rhode Island
Narragansett, Rhode Island 02882

^* Present address: Jackson School of Geoscience, the University of Texas at Austin, 1 University Station C1100, Austin, Texas 78712.

Removing the crustal signature from teleseismic travel times is an important procedure to reduce the trade-off between crustal and mantle velocity heterogeneities in seismic tomography. Because reverberations of long- and short-period body-wave arrivals in the crust affect the waveforms of the direct arrivals differently, the crustal effects on travel times measured by waveform cross correlation are frequency dependent. With synthetic responses of selected crustal models, this short note illustrates the significance of frequency-dependent crustal corrections to finite- frequency body-wave travel-time tomography. The differences in crustal correction between long- and short-period body waves at the same station can be as large as 0.6 sec, depending on the crustal thickness, velocity contrast at the Moho, and layering within the crust.