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Seismic velocity and Q‐structure of the upper mantle lid and low velocity zone for the Eastern Great Basin
Author(s) -
Olsen K. H.,
Braile L. W.,
Johnson P. A.
Publication year - 1980
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl007i012p01029
Subject(s) - geology , seismogram , mantle (geology) , structural basin , seismology , seismic velocity , transition zone , velocity gradient , low velocity zone , hotspot (geology) , geophysics , paleontology , lithosphere , tectonics , physics , mechanics
A 100‐km‐long record section of NTS explosions recorded in the eastern Snake River Plains lpar;7°<Δ<8°) shows the cusp of critical refractions from the steepened P velocity gradient at the bottom of the upper mantle LVZ. Synthetic seismograms calculated with a modified reflectivity program have been used to derive a regional velocity model of the upper mantle beneath the eastern Great Basin. The model suggests that observed very weak P n arrivals are due to a slight negative velocity gradient below the Moho and that no high velocity mantle lid exists in this region.