Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; August 1984; v. 74; no. 4; p. 1263-1274
© 1984 Seismological Society of America
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Reconnaissance seismic refraction-reflection surveys in northwestern New Mexico

LAWRENCE H. JAKSHA and DAVID H. EVANS

U.S. GEOLOGICAL SURVEY AND NEW MEXICO INSTITUTE OF MINING AND TECHNOLOGY, SOCORRO, NEW MEXICO 87801
MINERALS MANAGEMENT SERVICE, ANCHORAGE, ALASKA 99501

Abstract

A velocity model of the crust in northwestern New Mexico has been constructed from an interpretation of direct, refracted, and reflected seismic waves. The model suggests a sedimentary section about 3 km thick with an average P-wave velocity of 3.6 km/sec. The crystalline upper crust is 28 km thick and has a P-wave velocity of 6.1 km/sec. The lower crust below the Conrad discontinuity has an average P-wave velocity of about 7.0 km/sec and a thickness near 17 km. Some evidence suggests that velocity in both the upper and lower crust increases with depth. The P-wave velocity in the uppermost mantle is 7.95 ± 0.15 km/sec. The total crustal thickness near Farmington, New Mexico, is about 48 km (datum = 1.6 km above sea level), and there is evidence for crustal thinning to the southeast.




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