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\begin{document}

\title{Detection of Temporal Change in Near-Source Attenuation Affected by
Fluid Migration in the Source Region of Intense Earthquake Swarm in the
Yamagata-Fukushima Border, NE Japan}



\author[1,1]{Keisuke Yoshida}%
\affil[1]{Tohoku University}%


\vspace{-1em}



  
  \date{May 07, 2024}


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\begin{abstract}
The behaviour of fluids in the crust is key to understanding earthquake
occurrence due to the effect of fluid behaviour on fault strength. The
attenuation of seismic waves may be locally high in fault zones as
fluids are intensely distributed in these zones. This study uses a
novel, simple approach to examine near-source attenuation in the focal
region of intense swarm activity in the Yamagata-Fukushima border
region, Japan. Near-source attenuation was estimated by determining the
decay of amplitude ratios of nearby earthquake pairs with travel time
differences precisely quantified using a waveform correlation. In the
initial \textasciitilde{}50 d, Q\^{}(-1) was high, then it significantly
decreased to become almost constant for the subsequent period. This
pattern is similar to those independently observed for background
seismicity rate, b-value, stress drop, and fault strength. These
patterns can be attributed to the hypothesis that the swarm was
triggered by fluid movement following the 2011 Tohoku-Oki earthquake,
and the source and seismicity characteristics and the seismic
attenuation were altogether affected by the temporal change in pore
pressure. The method demonstrated in this study may be a useful tool to
detect high pore pressure anomaly at depth and understand its
relationship with earthquake occurrence.%
\end{abstract}%



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