Shear strength of the great Pacific fracture zones

Details Shear strength of the great Pacific fracture zones Shear strength of the great Pacific fracture zones

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.2023b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 20, p. 2023-2026.

Physics

7

Crustal Fractures, Earth Crust, Ocean Bottom, Shear Strength, Pacific Ocean, Shear Stress, Structural Properties (Geology)

Scientific paper

Shipboard bathymetry and gravity data from 30 crossings of 6 great Pacific fracture zones (FZs), the Mendocino, Murray, Molokai, Clarion, Clipperton, and Udintsev, are compared with the predictions of a model in which FZs are locked beyond the ridge-transform intersection, such that no vertical motion occurs on the fault in response to differential thermal subsidence. At least some sections of all of these FZs, except the Molokai, are consistent with this model and sustain shear stresses as high as 20 MPa. However, none of the FZs is locked along its entire length, as inferred from observed shear stresses dropping below 75 percent of the value necessary to maintain a locked fault. There is some suggestion that the unlocking may be related to excess volcanism.

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