Computer Science – Sound
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2373j&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 24, p. 2373-2376.
Computer Science
Sound
20
Electromagnetism, Geomagnetism, Heat Transmission, Rocky Mountains (North America), Seismology, Canada, Earth Crust
Scientific paper
As part of Lithoprobe's Southern Cordilleran transect investigations, magnetotelluric (MT) soundings were made at 160 sites providing unprecedented coverage from the Rockies to the west coast. Striking lateral variation, which spatially correlates with the morphogeological belt boundaries, is apparent at periods sensing the lower crust (about 10 s). For the Rockies, MT phases are around 35-deg, indicative of a moderately resistive (100's - 1000's Omega-m) North American Basement. Foreland belt phases are transitional and increase from 60 deg in the east to 70 deg in the west. Omineca and Coast belt phases are high (75 deg), implying a conductive (10-30 Omega-m) lower crust, whereas Intermontane belt phases are more than 10 deg lower (equivalent to about 150 Omega-m). The regional variation in conductivity correlates to first order with surface heat flow changes along the profile and is also correlative with coincident seismic reflection sections in some aspects.
Boerner David E.
Craven James A.
Delaurier Jon M.
Ellis Rob G.
Gough Ian D.
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