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- W1992078382 abstract "[1] Theodolite measurements across the right-lateral Hayward fault, San Francisco Bay, California, show a dramatic reduction in surface creep rate from 5 to 10 mm/yr before the 1989 Loma Prieta earthquake to nearly zero creep rate after the earthquake. A ∼6 year period of nearly zero surface creep was followed by sudden fault creep that accumulated about 20–25 mm of right-lateral displacement followed by an eventual return to a steady creep by year ∼2000. This creep behavior can be explained as a result of a sudden shear stress reduction on the fault and is consistent with model predictions for a fault imbedded in an elastic medium with slip governed by laboratory-derived friction laws. We infer friction parameters on the fault using a spring-slider model and a boundary element model with the rate- and state-dependent friction laws. The state (healing) term in the friction law is critical for reproducing the observed evolution of surface creep; a popular simplified rate-dependent friction law is insufficient. Results suggest that the creep event extended to a depth of ∼4–7.5 km. The inferred critical slip distance, dc, is 1–2 orders of magnitude larger than lab values, and inferred aσ values imply low effective fault-normal stresses of 5–30 MPa. This range of effective normal stress and inversion results for (a − b)σ imply very small values for a − b of 10−5 to 10−3, suggesting the fault has nearly velocity-neutral frictional properties. Earthquake simulations with such small a − b values show that creeping areas on the Hayward fault may be capable of rupturing during earthquakes." @default.
- W1992078382 created "2016-06-24" @default.
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- W1992078382 date "2011-04-13" @default.
- W1992078382 modified "2023-09-25" @default.
- W1992078382 title "Arrest and recovery of frictional creep on the southern Hayward fault triggered by the 1989 Loma Prieta, California, earthquake and implications for future earthquakes" @default.
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- W1992078382 doi "https://doi.org/10.1029/2010jb007927" @default.
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