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Geology of the Pacific Northwest
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Table of Tectonic Plate Boundaries
Boundary Type Relative Plate Motion Map Symbol Regional Stress Main Fault Type Rock Types Landforms
divergent tension normal
  • pillow basalt
  • gabbro
  • serpentinite
  • mid-ocean spreading ridges
  • rift valleys
transform shear strike-slip
  • pre-existing rocks sheared & fractured in fault zones
  • major strike-slip fault zones
  • transverse mountains(folded & faulted, no volcanoes)
convergent compression thrust
  • andesite
  • dacite
  • rhyolite
  • diorite
  • granodiorite
  • granite
  • oceanic trenches
  • volcanic arcs
  • accretionary complexes
  • forearc basins

 

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Geology of the Pacific Northwest
Plate Boundaries Table
© 2001 Ralph L. Dawes, Ph.D. and Cheryl D. Dawes
updated: 6/21/13