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Imaging the Juan de Fuca plate beneath southern Oregon using teleseismic P wave residuals

January 1, 1991

Images the Juan de Fuca plate in southern Oregon using seismic tomography. P wave travel time residuals from a 366-km-long seismic array operated in southern Oregon in 1982 are inverted. The southeast striking array extended from the Coast ranges to the Modoc Plateau and crossed the High Cascades at Crater Lake, Oregon. Three features under the array were imaged: one high-velocity zone and two low-velocity zones. The high-velocity zone is 3-4% faster than the surrounding upper mantle. It dips steeply at 65?? to the east beneath the Cascade Range and extends down to at least 200 km. It is proposed that this high-velocity feature is subducted Juan de Fuca plate. Two low-velocity zones were also imaged, both of which are 3-4% slower than the surrounding earth structure. The southeastern low-velocity zone may be caused by partially molten crust underlying the Crater Lake volcano region. -from Authors

Citation Information

Publication Year 1991
Title Imaging the Juan de Fuca plate beneath southern Oregon using teleseismic P wave residuals
DOI
Authors R.A. Harris, H.M. Iyer, P.B. Dawson
Publication Type Article
Publication Subtype Journal Article
Series Title Journal of Geophysical Research
Series Number
Index ID 70016548
Record Source USGS Publications Warehouse
USGS Organization

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