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\begin{document}

\title{COEXISTENCE OF FAST AND SLOW SLIP EVENTS IN LABORATORY SEISMIC CYCLES}



\author[1]{Kseniya G. Morozova}%
\author[1]{Vadim K. Markov}%
\author[1]{Dmitry V. Pavlov}%
\author[2]{Maxim F. Popov}%
\author[3]{Alexey A. Ostapchuk}%
\affil[1]{Sadovsky Institute for Dynamics of Geospheres of Russian Academy of Sciences}%
\affil[2]{Bauman Moscow State Technical University}%
\affil[3]{Moscow Institute of Physics and Technology}%


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  \date{May 07, 2024}


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\begin{abstract}
The spectrum of slip modes on gouge-filled faults spans a continuum from
fast ruptures to slow slip events. The nucleation of a certain slip mode
is governed by the frictional heterogeneity of fault interface and the
rheological fault stiffness. Though the pattern of mechanical parameter
variation and dynamic stability loss during a seismic cycle is quite
clear, it is important to have a unified seismic-acoustic signature of
slow or fast slip event nucleation. We present laboratory acoustic
emission (AE) experiments on a slider-model with a precise control of
mechanical and AE parameters. A comprehensive analysis of AE activity
points to the presence of two AE subpopulations. One of them manifests
as pulses with harsh onsets. The second one exhibits a gradual amplitude
rise and tremor-like signal. The second AE subpopulation shows a longer
failure duration and increased energy dissipation. Regularities of
changing the frequency-amplitude characteristics of AE subpopulations
during a laboratory seismic cycle differ. The first AE subpopulation
retains parameters of frequency-amplitude distribution, but the second
one exhibits a pronounced cyclic recurrence of the \emph{b-value}. The
latter decreases before slip events and recovers after them. The
detected features of AE subpopulations are common for the entire
spectrum of slip modes. Findings reveal a coexistence of slow and fast
modes at the same fault at the micro-scale and point to the unity of
underlying physical mechanisms of different slip mode nucleation.%
\end{abstract}%



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\textbf{Hosted file}

\verb`supplementary materials - morozova et al._31.07.docx`  available at \url{https://authorea.com/users/543147/articles/601458-coexistence-of-fast-and-slow-slip-events-in-laboratory-seismic-cycles}\selectlanguage{english}
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