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\begin{document}

\title{Enigmatic tsunami waves amplified by repetitive source events near
Sofugan volcano, Japan}



\author[1]{Osamu Sandanbata}%
\author[2]{Kenji Satake}%
\author[3]{Shunsuke Takemura}%
\author[2]{Shingo Watada}%
\author[4]{Takuto Maeda}%
\author[5]{Tatsuya Kubota}%
\affil[1]{Earthquake Research Institute, The University of Tokyo}%
\affil[2]{University of Tokyo}%
\affil[3]{Earthquake Research Institute, the University of Tokyo}%
\affil[4]{Hirosaki University}%
\affil[5]{Affiliation not available}%


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  \date{June 15, 2024}


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\begin{abstract}
On 8 October 2023, mysterious tsunamis with a maximum wave height of 60
cm were observed in Izu Islands and southwestern Japan, although only
seismic events with body-wave magnitudes mb 4--5 have been documented to
the west of Sofugan volcano. To investigate the source process, we
analyze tsunami waveforms recorded by an array network of ocean bottom
pressure gauges. A stacked waveform of pressure gauge records suggests
recurrent arrivals of multiple wave trains. Deconvolution of the stacked
waveform by a tsunami waveform from an earlier event revealed over 10
source events that intermittently generated tsunamis for
\textasciitilde{}1.5 hours. The temporal history of this sequence
corresponds to the origin times of T-phases estimated by an ocean bottom
seismometer and of the seismic swarm, implying a common origin. Larger
events later in the sequence occurred at intervals comparable to the
tsunami wave period, causing amplification of later phases of the
tsunami waves.%
\end{abstract}%



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