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\begin{document}

\title{Calibrated absolute seafloor pressure measurements for geodesy in
Cascadia}



\author[1]{Matthew James Cook}%
\author[2]{Erik K Frederickson}%
\author[2]{Emily Carlson Roland}%
\author[3]{Glenn S. Sasagawa}%
\author[2]{David Schmidt}%
\author[2]{William S. D. Wilcock}%
\author[3]{Mark Andrew Zumberge}%
\affil[1]{University of California San Diego}%
\affil[2]{University of Washington}%
\affil[3]{University of California, San Diego}%


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  \date{May 29, 2024}


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\begin{abstract}
\textbf{}The boundary between the overriding and subducting plates is
locked along some portions of the Cascadia subduction zone. The extent
and location of locking affects the potential size and frequency of
great earthquakes in the region. Because much of the boundary is
offshore, measurements on land are incapable of completely defining a
locked zone in the up-dip region. Deformation models indicate that a
record of seafloor height changes on the accretionary prism can reveal
the extent of locking. To detect such changes, we have initiated a
series of calibrated pressure measurements using an absolute
self-calibrating pressure recorder (ASCPR). A piston-gauge calibrator
under careful metrological considerations produces an absolutely known
reference pressure to correct seafloor pressure observations to an
absolute value. We report an accuracy of about 25 ppm of the water
depth, or 0.02 kPa (0.2 cm equivalent) at 100 m to 0.8 kPa (8 cm
equivalent) at 3,000 m. These campaign survey-style absolute pressure
measurements on seven offshore benchmarks in a line extending 100 km
westward from Newport, Oregon from 2014 to 2017 establish a long-term,
sensor-independent time series that can, over decades, reveal the extent
of vertical deformation and thus the extent of plate locking and place
initial limits on rates of subsidence or uplift. Continued surveys
spanning years could serve as calibration values for co-located or
nearby continuous pressure records and provide useful information on
possible crustal deformation rates, while epoch measurements spanning
decades would provide further limits and additional insights on
deformation.%
\end{abstract}%



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