Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pepi...53..221d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 53, Issue 3-4, p. 221-227.
Physics
8
Scientific paper
The effect of the depth of the dipping Juan de Fuca Plate subducting the west coast of the Vancouver Island-Washington-Oregon region is studied using a scaled laboratory analogue model. The subducting plate is modelled horizontal offshore, then dipping at 10° under Vancouver Island, and dipping further at 30° as it subducts the continent for the British Columbia region and 45° under the Washington-Oregon region. The strike of the bending plate follows the general strike of the continental coastline with an abrupt 42° change in direction in the Puget Sound area.
The model results show that the coast effect, described by the vertical to horizontal magnetic field ratio, is highly dependent upon the period and the depth of the dipping substructure, while the conducting boundaries of the subducting plate significantly reduce the apparent resistivities for coastal locations. Enhanced induction arrows exist for a large range inland, owing to the steeply dipping subducting plate.
Chen Jiahua
Dosso H. W.
Nienaber W.
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