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\title{Permeability and elastic properties of rocks from the northern Hikurangi
margin: Implications for slow-slip events}



\author[1]{Nicola Tisato}%
\author[1]{Carolyn Bland}%
\author[1]{Harm Van Avendonk}%
\author[1]{Nathan Bangs}%
\author[1]{Hector Kevin Garza}%
\author[1]{Omar Alamoudi}%
\author[1]{Kelly Olsen}%
\author[1]{Andrew Gase}%
\affil[1]{Affiliation not available}%


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  \date{May 08, 2026}


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\begin{abstract}
Fluid flow and pore-pressure cycling are believed to control slow slip
events (SSEs), such as those that frequently occur at the northern
Hikurangi margin (HM) of New Zealand. To better understand fluid flow in
the forearc system we examined the relationship between several physical
properties of Cretaceous-to-Pliocene sedimentary rocks from the
Raukumara peninsula. We found that the permeability of the deep wedge is
too low to drain fluids, but fracturing increases permeability by orders
of magnitude, making fracturing key for fluid flow. In weeks to months,
plastic deformation, swelling, and possibly not-yet-identified
mechanisms heal the fractures, restoring the initial permeability. We
conclude that overpressures at the northern HM might partly dissipate
during SSEs due to enhanced permeability near faults. However, in the
months following an SSE, healing in the prism will lower permeability,
forcing pore pressure to rise and a new SSE to occur.%
\end{abstract}%



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PAPER SUBMITTED TO GEOPHYSICAL RESEARCH LETTERS - AGU

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