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\begin{document}

\title{In-situ Measurement of Dislocation-induced Anelasticity by Using a Rock
Analogue}



\author[1]{Yuto Sasaki}%
\author[1]{Yasuko Takei}%
\affil[1]{Earthquake Research Institute, University of Tokyo}%


\vspace{-1em}



  
  \date{June 14, 2024}


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\begin{abstract}
We developed a new experimental system with which anelasticity of a rock
analogue sample (polycrystalline borneol) can be measured in situ during
dislocation creep. We attached a piezo-electric actuator to a triaxial
deformation apparatus, to add a small cyclic load to a large constant
load. We also attached a load cell and two laser displacement meters to
measure the small cyclic load and displacement accurately. Using this
new system, we deformed a polycrystalline borneol sample under diffusion
creep (\selectlanguage{greek}σ \selectlanguage{english}= 0.27 MPa) for about 1 day, intermediate creep (\selectlanguage{greek}σ \selectlanguage{english}[?] \selectlanguage{english}1.1 MPa)
for about 0.5 day and dislocation creep (\selectlanguage{greek}σ \selectlanguage{english}[?] \selectlanguage{english}2.2 MPa) for about 1 day
continuously, and performed an in-situ measurement of Young's modulus
and attenuation at frequencies of 2.5 and 1.0 Hz. During the first
diffusion creep, Young's modulus increased, probably due to the improved
contact between the sample and the piston, and reached a constant value.
Although the modulus did not change during the second intermediate
creep, it gradually decreased during the third dislocation creep. The
final modulus reduction was about 20\%. The present result supports our
previous result obtained from the anelasticity measurement of a
pre-deformed sample (Sasaki et al., 2017, AGU fall meeting; Sasaki et
al., 2019, submitted to JGR). In the previous study, we showed that
detailed form of the dislocation creep curves can be explained well by
considering a gradual increase in dislocation density during the
dislocation creep. Also, reduction of Young's modulus by about 10\% was
observed after the dislocation creep under the similar condition to this
study. The gradual decrease in Young's modulus observed in this present
study provides a supporting evidence for these previous results.
Frequency dependence of the dislocation-induced anelasticity obtained
from our previous study is a peak at much higher frequency than the
grain boundary-induced anelasticity (Sasaki et al., 2017, AGU fall
meeting; Sasaki et al., 2019, submitted to JGR). In contrast,
dislocation-induced anelasticity obtained from single crystal forsterite
or polycrystalline olivine is a broad absorption band (Gu\selectlanguage{ngerman}éguen et al.,
1989; Farla et al., 2012). It is important to clarify the reason for
this discrepancy.%
\end{abstract}\selectlanguage{ngerman}%



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