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Rotation and plate locking at the Southern Cascadia Subduction Zone
Author(s) -
McCaffrey Robert,
Long Maureen D.,
Goldfinger Chris,
Zwick Peter C.,
Nabelek John L.,
Johnson Cheryl K.,
Smith Curt
Publication year - 2000
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 - 10.1029/2000gl011768
Subject(s) - geology , subduction , clockwise , seismology , rotation (mathematics) , lineament , thrust , submarine pipeline , basin and range province , geodesy , tectonics , geometry , oceanography , physics , mathematics , thermodynamics
Global Positioning System vectors and surface tilt rates are inverted simultaneously for the rotation of western Oregon and plate locking on the southern Cascadia subduction thrust fault. Plate locking appears to be largely offshore, consistent with earlier studies, and is sufficient to allow occasional great earthquakes inferred from geology. Clockwise rotation of most of Oregon about a nearby pole is likely driven by collapse of the Basin and Range and results in shortening in NW Washington State. The rotation pole lies along the Olympic‐Wallowa lineament and explains the predominance of extension south of the pole and contraction north of it.