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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/, Gutenberg-Richter's law in sliding friction of gels
 

Summary: JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/,
Gutenberg-Richter's law in sliding friction of gels
Tetsuo Yamaguchi1
, Masatoshi Morishita1
, Masao Doi1
, Takane Hori2
, Hide
Sakaguchi2
, and Jean-Paul Ampuero3
Abstract. We report on experimental studies of spatio-temporally heterogeneous stick-
slip motions in the sliding friction between a hard polymethyl methacrylate (PMMA,
plexiglass) block and a soft poly-dimethyl siloxane (PDMS, silicone) gel plate. We per-
form experiments on two PDMS gels with different viscoelastic properties. For the less
viscous gel, large and rapid events are preceded by an alternation of active and less ac-
tive periods. For the more viscous gel, successive slow slip events take place continuously.
The probability distributions of the force drop, a quantity analogous to seismic moment,
obey a power law similar to Gutenberg-Richter's empirical law for the frequency-size statis-
tics of earthquakes, and the exponents of the power law vary with the plate velocity and
the viscosity of the gel. We propose a simple model to explain the dependence of the
power law exponent on the plate velocity, which agrees with experimental results.

  

Source: Ampuero, Jean Paul - Division of Geological and Planetary Sciences, California Institute of Technology

 

Collections: Geosciences