Physics
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3810301d&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 10, CiteID L10301
Physics
1
Seismology: Earthquake Dynamics (1242), Structural Geology: Rheology And Friction Of Fault Zones (8163), Structural Geology: Dynamics And Mechanics Of Faulting (8118)
Scientific paper
Observations of nonvolcanic tremor provide a unique window into the mechanisms of deformation and failure in the lower crust. At increasing depths, rock deformation gradually transitions from brittle, where earthquakes occur, to ductile, with tremor occurring in the transitional region. The physics of deformation in the transition region remain poorly constrained, limiting our basic understanding of tremor and its relation to earthquakes. We combine field and laboratory observations with a physical friction model comprised of brittle and ductile components, and use the model to provide constraints on the friction and stress state in the lower crust. A phase diagram is constructed that characterizes under what conditions all faulting behaviors occur, including earthquakes, tremor, silent transient slip, and steady sliding. Our results show that tremor occurs over a range of ductile and brittle frictional strengths, and advances our understanding of the physical conditions at which tremor and earthquakes take place.
Daub Eric G.
Guyer Robert A.
Johnson Paul A.
Shelly David R.
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