title: Probing failure susceptibilities of earthquake faults using small-quake tidal correlations.
abstract: Mitigating the devastating economic and humanitarian impact of large earthquakes requires signals for forecasting seismic events. Daily tide stresses were previously thought to be insufficient for use as such a signal. Recently, however, they have been found to correlate significantly with small earthquakes, just before large earthquakes occur. Here we present a simple earthquake model to investigate whether correlations between daily tidal stresses and small earthquakes provide information about the likelihood of impending large earthquakes. The model predicts that intervals of significant correlations between small earthquakes and ongoing low-amplitude periodic stresses indicate increased fault susceptibility to large earthquake generation. The results agree with the recent observations of large earthquakes preceded by time periods of significant correlations between smaller events and daily tide stresses. We anticipate that incorporating experimentally determined parameters and fault-specific details into the model may provide new tools for extracting improved probabilities of impending large earthquakes.
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Braden A W
authors.initials: BA
authors.lastname: Brinkman
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: LeBlanc
authors.affiliation: Department of Earth Sciences, University of Southern California, Los Angeles, California 90089-0740, USA.
authors.forename: Yehuda
authors.initials: Y
authors.lastname: Ben-Zion
authors.affiliation: Retired, Los Angeles, California, USA.
authors.forename: Jonathan T
authors.initials: JT
authors.lastname: Uhl
authors.affiliation: Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: Karin A
authors.initials: KA
authors.lastname: Dahmen