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Comparison of fluid flow pathways, fluid composition, fluid flow SSEs at subduction zones. The ability to integrate the SAFFRONZ
rates, and flow transients between the northern and southern experiment with concurrent bottom pressure recorder deployments,
areas will provide information on the differences in the nature of onshore cGPS data, IODP borehole monitoring experiments, 2D
dewatering between the accretionary southern portion of the margin and 3D seismic reflection data, and other data to be collected along
hosting deep SSEs and the dominantly non-accretionary northern the margin in the next few years greatly enhance the outcomes of
portion with shallow SSEs. The along-strike comparison will also this project. The synthesis of the results from all the concurrent
provide a control (reference) transect to compare regional (i.e. flow experiments being conducted at Hikurangi promises to be very
in response to SSEs in the north) to other hydrologic phenomena. exciting and the integration of the hydrologic data produced from
From both scientific and societal perspectives, results from this this project will result in an unprecedented view of deformation and
hydrological responses to slow slip at subduction zones. ■
project will contribute to our understanding of fault slip behavior
offshore New Zealand that have global implications for the postulated
interdependence of temperature, pore pressure, fluid flow, and NSF GeoPRISMS Awards #1753617, 1753665

References

Barnes, P.M., G. Lamarche, J. Bialas, I. Pecher, S. Henrys, G. Netzeband, Saffer, D.M., L.M. Wallace, (2015), The frictional, hydrologic, metamorphic
J. Greinert, J. Mountjoy, K. Pedley, G. Crutchley, (2010), Tectonic and thermal habitat of shallow slow earthquakes. Nat. Geosci., 8(8),
and Geological framework for gas hydrates and cold seeps on the 594–600.
Hikurangi subduction margin, New Zealand, Marine Geology. doi: Saffer, D.M., L.M. Wallace, K. Petronotis, (2017), Expedition 375 Scientific
10.1016/j.margeo.2009.03.012 Prospectus: Hikurangi margin coring and observatories. International
Brown, K.M., M.D. Tryon, H.R. DeShon, L.M. Dorman, S.Y. Schwartz (2005), Ocean Discovery Program. doi.org/10.14379/iodp.sp.375.2017
Correlated transient fluid pulsing and seismic tremor in the Costa Rica Solomon, E.A., M. Kastner, H. Jannasch, G. Robertson, Y. Weinstein, (2008),
subduction zone, Earth Planet. Sci. Lett., 238, 189-203. Dynamic fluid flow and chemical fluxes associated with a seafloor gas
Obana, K., S. Kodaira,(2009), Low-frequency tremors associated with hydrate deposit on the northern Gulf of Mexico slope. Earth Planet.
reverse faults in a shallow accretionary prism. Earth Planet. Sci. Lett. Sci. Lett. 270, 95-105.
287, 168–174. Tryon, M.D., K.M. Brown, M.E. Torres, (2002), Fluid and chemical flux in and
Ranero, C. R., I. Grevemeyer, H. Sahling, U. Barckhausen, C. Hensen, K. out of sediments hosting methane hydrate deposits on Hydrate Ridge,
Wallmann, W. Weinrebe, P. Vannucchi, R. von Huene, K. McIntosh Or, II: hydrological processes. Earth Planet. Sci. Let. 201, 541–557.
(2008), Hydrogeological system of erosional convergent margins and Wallace, L.M., J. Beavan, R. McCaffrey, D. Darby, (2004), Subduction zone
its influence on tectonics and interplate seismogenesis, Geochemistry coupling and tectonic block rotation in the North Island, New Zealand,
Geophysics Geosystems, 9(3), Q03S04. J. Geophys. Res., 109, doi:10.1029/2004JB003241
Saffer, D.M., H.J. Tobin, (2011), Hydrogeology and mechanics of subduction Wallace, L.M., J. Beavan, (2010), Diverse slow slip behavior at the Hikurangi
zone forearcs: Fluid flow and pore pressure, Ann. Rev. Earth Planet. subduction margin, New Zealand, J. Geophys Res., 115(B12402),
Sci., 39, 157-186. doi:10.1029/2010JB007717

GeoPRISMS Data Portal

Visit the GeoPRISMS Data Portal to find information for each Primary Site:
• Pre-existing data sets and field programs
• Data sets ready for download
• Links to partner programs and resources
• References database with papers tied to data
GeoPRISMS references database of relevant publications is now available:
http://www.marine-geo.org/portals/geoprisms/references.php

To submit missing data sets, field programs or publications to the GeoPRISMS portal, contact
info@marine-geo.org

Spring 2018 Issue No. 40 GeoPRISMS Newsletter • 11