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Title: 1978 Yellowstone-eastern Snake River Plain seismic profiling experiment: Data and upper crustal structure of the Yellowstone region

Abstract

Eleven in-line refraction profiles, recorded to distances of 300 km, and one azimuthal fan plot were constructed from data recorded with a 150-station array in the Yellowstone National Park area during the 1978 Yellowstone-Snake River Plain seismic experiment. Interpretations of the data suggest that the crustal P wave velocity model for the Yellowstone region is characterized by (1) an averaged 10-km-thick upper crustal layer, V/sub p/ = 6.0 km/s, (2) an average crustal velocity of 6.3 km/s, and (3) a total crustal thickness of 44 km. Velocity models are presented for profiles that emphasize the upper crust and show (1) a decrease in the depth to the top of the upper crustal crystalline basement from 5 km in southwestern Yellowstone near Island Park to 1 km at the northeast side of the Yellowstone Plateau that is interpreted as a progressive thinning of the silicic surface volcanic layer to the northeast and (2) evidence for a large lateral inhomogeneity interpreted to be a low-velocity body, with a decrease of at least 10% in P wave velocity, located beneath the northeast corner of the Yellowstone Plateau. The low-velocity zone coincides with a local -30-mgal residual gravity anomaly and is located beneath partmore » of the Sour Creek resurgent dome and part of the Hot Springs Basin, the largest hydrothermal system in Yellowstone. The low-velocity body has a maximum depth to the top of 3 km and a minimum depth to the bottom of 9 km and may represent a zone of partial melt. In comparison to the thermally undisturbed upper crust of the surrounding Rocky Mountains the upper crust of the northeastern Yellowstone plateau appears laterally inhomogeneous in velocity and layer thickness, suggesting effects of thermal and magma intrusion, whereas the lower crust appears relatively homogeneous.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Department of Geology and Geophysics, University of Utah, Salt Lake City, Utah 84112
OSTI Identifier:
6866343
Resource Type:
Journal Article
Journal Name:
J. Geophys. Res.; (United States)
Additional Journal Information:
Journal Volume: 87:B4
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; IDAHO; CONTINENTAL CRUST; YELLOWSTONE NATIONAL PARK; INTRUSION; LAYERS; SEISMIC P WAVES; VOLCANIC ROCKS; WAVE PROPAGATION; EARTH CRUST; FEDERAL REGION X; IGNEOUS ROCKS; NORTH AMERICA; PUBLIC LANDS; ROCKS; SEISMIC WAVES; USA; 580201* - Geophysics- Seismology & Tectonics- (1980-1989)

Citation Formats

Schilly, M M, Smith, R B, Braile, L W, and Ansorge, J. 1978 Yellowstone-eastern Snake River Plain seismic profiling experiment: Data and upper crustal structure of the Yellowstone region. United States: N. p., 1982. Web. doi:10.1029/JB087iB04p02692.
Schilly, M M, Smith, R B, Braile, L W, & Ansorge, J. 1978 Yellowstone-eastern Snake River Plain seismic profiling experiment: Data and upper crustal structure of the Yellowstone region. United States. https://doi.org/10.1029/JB087iB04p02692
Schilly, M M, Smith, R B, Braile, L W, and Ansorge, J. 1982. "1978 Yellowstone-eastern Snake River Plain seismic profiling experiment: Data and upper crustal structure of the Yellowstone region". United States. https://doi.org/10.1029/JB087iB04p02692.
@article{osti_6866343,
title = {1978 Yellowstone-eastern Snake River Plain seismic profiling experiment: Data and upper crustal structure of the Yellowstone region},
author = {Schilly, M M and Smith, R B and Braile, L W and Ansorge, J},
abstractNote = {Eleven in-line refraction profiles, recorded to distances of 300 km, and one azimuthal fan plot were constructed from data recorded with a 150-station array in the Yellowstone National Park area during the 1978 Yellowstone-Snake River Plain seismic experiment. Interpretations of the data suggest that the crustal P wave velocity model for the Yellowstone region is characterized by (1) an averaged 10-km-thick upper crustal layer, V/sub p/ = 6.0 km/s, (2) an average crustal velocity of 6.3 km/s, and (3) a total crustal thickness of 44 km. Velocity models are presented for profiles that emphasize the upper crust and show (1) a decrease in the depth to the top of the upper crustal crystalline basement from 5 km in southwestern Yellowstone near Island Park to 1 km at the northeast side of the Yellowstone Plateau that is interpreted as a progressive thinning of the silicic surface volcanic layer to the northeast and (2) evidence for a large lateral inhomogeneity interpreted to be a low-velocity body, with a decrease of at least 10% in P wave velocity, located beneath the northeast corner of the Yellowstone Plateau. The low-velocity zone coincides with a local -30-mgal residual gravity anomaly and is located beneath part of the Sour Creek resurgent dome and part of the Hot Springs Basin, the largest hydrothermal system in Yellowstone. The low-velocity body has a maximum depth to the top of 3 km and a minimum depth to the bottom of 9 km and may represent a zone of partial melt. In comparison to the thermally undisturbed upper crust of the surrounding Rocky Mountains the upper crust of the northeastern Yellowstone plateau appears laterally inhomogeneous in velocity and layer thickness, suggesting effects of thermal and magma intrusion, whereas the lower crust appears relatively homogeneous.},
doi = {10.1029/JB087iB04p02692},
url = {https://www.osti.gov/biblio/6866343}, journal = {J. Geophys. Res.; (United States)},
number = ,
volume = 87:B4,
place = {United States},
year = {Sat Apr 10 00:00:00 EST 1982},
month = {Sat Apr 10 00:00:00 EST 1982}
}