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The moho depth variations under the LASA and their effect on dT/d measurements

LINCOLN LABORATORY M. I. T., LEXINGTON, MASSACHUSETTS

Abstract

The LASA array in Montana was used to measure the slope of the travel-time curve (dT/d) for events with epicenters to the northwest and southeast. Lateral inhomogeneities under the array introduce large relative arrival time errors (station residuals). A model for the crust under LASA is proposed which can explain the station residuals. This crustal model accounts for the major differences between the measured and Jeffreys-Bullen (J-B) dT/d values. The model was used to correct the measured dT/d profiles for the crustal effect.

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