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Detailed Reference Information |
Hearn, T.M., Rosca, A.C. and Fehler, M.C. (1994). Pn tomography beneath the Southern Great Basin. Geophysical Research Letters 21: doi: 10.1029/94GL02054. issn: 0094-8276. |
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P-wave first arrival times recorded on the Southern Great Basin Seismic Network were used to tomographically image lateral variations in both crustal thickness and Pn velocity beneath the southern Great Basin. The tomographic image indicates that the southern Great Basin has a flat Moho at about 30 km depth. We attribute the flat Moho to both underplating by partial melt from the uppermost mantle and to ductile flow in the crust. Magmatic underplating probably dominates where Pn velocities are low (7.9 km/s). Low velocity regions occur predominantly beneath the east margin of the Walker Lane Belt and the Las Vegas Shear Zone suggesting that these shear zones overlie a zone of relatively weak mantle. A region of high Pn velocity northeast of Nevada Test Site (NTS) may correspond to old lithosphere or to a region that has experienced extensive basalt extraction. ¿ American Geophysical Union 1994 |
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Abstract |
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Keywords
Seismology, Structure of the crust, Seismology, Structure of the lithosphere and upper mantle, Tectonophysics, Continental tectonics |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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