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Bulletin of the Seismological Society of America; February 1969; v. 59; no. 1; p. 409-420
© 1969 Seismological Society of America
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The moho depth variations under the LASA and their effect on dT/d{Delta} measurements

ROY J. GREENFIELD and ROBERT M. SHEPPARD

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{Delta}) 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{Delta} values. The model was used to correct the measured dT/d{Delta} profiles for the crustal effect.




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