Physics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9815967e&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. B9, p. 15,967-15,985.
Physics
8
Earth Crust, Earth Planetary Structure, Imaging Techniques, Structural Properties (Geology), Anomalies, Electrical Resistivity, Geomagnetism, Subduction (Geology)
Scientific paper
Variations of vertically integrated electrical conductivity in the crust of southwestern Washington are imaged on the basis of data from a series of small (three to five stations) overlapping magnetovariational (MV) arrays. Two principal structures are revealed: a large north-south trending anomaly (the southern Washington Cascades Conductor (SWCC)), and a smaller anomaly which branches off of the SWCC just north of Mount St. Helens and trends westward beneath the Chehallis Basin. It is suggested that the SWCC represents a section of the early Cenozoic subduction zone which is analogous to the present-day Olympic Peninsula. The magnetometer array data suggest that present patterns of crustal deformation and volcanism are in part controlled by the complex tectonic history and resulting crustal structure of the region.
Booker John R.
Egbert Gary D.
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