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Variations in creep rate along the Hayward Fault, California, interpreted as changes in depth of creep

January 1, 2001

Variations ill surface creep rate along the Hayward fault are modeled as changes in locking depth using 3D boundary elements. Model creep is driven by screw dislocations at 12 km depth under the Hayward and other regional faults. Inferred depth to locking varies along strike from 4-12 km. (12 km implies no locking.) Our models require locked patches under the central Hayward fault, consistent with a M6.8 earthquake in 1868, but the geometry and extent of locking under the north and south ends depend critically on assumptions regarding continuity and creep behavior of the fault at its ends. For the northern onshore part of the fault, our models contain 1.4-1.7 times more stored moment than the model of Bu??rgmann et al. [2000]; 45-57% of this stored moment resides in creeping areas. It is important for seismic hazard estimation to know how much of this moment is released coseismically or as aseismic afterslip.

Citation Information

Publication Year 2001
Title Variations in creep rate along the Hayward Fault, California, interpreted as changes in depth of creep
DOI 10.1029/2001GL012979
Authors R. W. Simpson, J.J. Lienkaemper, J.S. Galehouse
Publication Type Article
Publication Subtype Journal Article
Series Title Geophysical Research Letters
Series Number
Index ID 70023246
Record Source USGS Publications Warehouse
USGS Organization