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\begin{document}

\title{Receiver Function Analysis of the Magmatic Plumbing System Beneath Okmok
Volcano}



\author[1]{Madeleine Tan}%
\author[2]{Helen Janiszewski}%
\author[1]{Jeroen Ritsema}%
\affil[1]{University of Michigan}%
\affil[2]{University of Hawaii at Manoa}%


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  \date{May 27, 2024}


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\begin{abstract}
Okmok volcano on Umnak Island, Alaska is one of the most hazardous,
explosive volcanoes in the Aleutians. Most recently, it erupted in 2008.
Previous seismic imaging of Okmok's large caldera system revealed
complex magmatic structures in the upper 5 km beneath the caldera but
magma transport at larger depths remains poorly constrained due to
reduced imaging resolution. Using receiver function analysis of
waveforms, we aim to chart sharp boundaries in the crust beneath Okmok
and the surrounding region in order to understand its deeper crustal
magmatic system. We have calculated receiver functions for M6 and larger
teleseismic earthquakes between 2008 and 2021 recorded by permanent
networks AV and AK, and between 2015-2016 at temporary network 5F. We
observe Ps arrivals that are consistent with a Moho depth of
\textasciitilde{}40km, particularly at stations outside the caldera. At
some stations, we observe that receiver functions calculated for
incoming rays pointing towards the volcano are different from those
pointing away from the volcano. However, there is significant
variability in the receiver functions, even for overlapping ray paths in
the mid-to-deep crust (\textgreater{} 10 km). This suggests complex
crustal structure with heterogeneity that may be spatially localized
beneath individual stations. Furthermore, receiver functions for
stations inside Okmok caldera are more reverberatory than those outside
the caldera, indicating that the structure, likely predominantly in the
upper crust, beneath these two regions is different.%
\end{abstract}%



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