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The receiver structure beneath Mina, Nevada

STEPHEN G. MANGINO^*, GEORGE ZANDT and CHARLES J. AMMON

AIR FORCE GEOPHYSICS LABORATORY EARTH SCIENCES DIVISION, HANSCOM AFB, MASSACHUSETTS 01731-5000
INSTITUTE OF GEOPHYSICS AND PLANETARY PHYSICS LAWRENCE LIVERMORE NATIONAL LABORATORY, LIVERMORE, CALIFORNIA 94550
DEPARTMENT OF GEOSCIENCES THE PENNSYLVANIA STATE UNIVERSITY, STATE COLLEGE, PENNSYLVANIA 16802

Abstract

Receiver functions obtained from broadband teleseismic P waveforms recorded at seismic station MNV, near Mina, Nevada, are inverted for the vertical shear-wave velocity structure southeast of the station. The time-domain inversion procedure for vertically heterogeneous and laterally homogeneous one-dimensional models includes smoothness constraints to minimize model roughness and a pseudo-Monte-Carlo approach to investigate the nonuniqueness of the solution models. We also report on the potential effects of scattering on a receiver function inversion for a one-dimensional velocity structure. MNV receiver functions sample the Walker Belt crust and upper mantle beneath the Soda Spring Valley and Pilot Mountains to the east and the Garfield Hills and Excelsior Mountains to the west of the station. The preferred southeast solution models show a smooth positive gradient in the mid- and lower crust with the top of the crust-mantle boundary at 34- to 36-km depth, reaching an upper-mantle P velocity of 7.8 to 7.9 km sec^–1 between 38 and 40 km. These results suggest that the crust beneath MNV may be representative of a transition zone between typical Basin and Range province crust to the east and a thicker Sierran block to the west of the station.

Footnotes

^* Present address: Weston Observatory, Department of Geology and Geophysics, Boston College, Weston, Massachusetts 02193.

Present address: Earth Science Board, Institute of Tectonics, University of California, Santa Cruz, California 95060.

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