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slip and locking behavior in time and space at of exhumed rocks. As part of this broader to investigate along-strike variations in
the Cascadia and Hikurangi margins; seafloor initiative, the “ExTerra Field Institute and megathrust locking and slip. This 4-year
geodesy studies in Alaska and Cascadia; an Research Endeavor (E-FIRE)” proposal project is in its first year. The New Zealand
analysis of seafloor geodetic and structural was submitted to NSF PIRE (Partnerships 3D community seismic experiment focuses
data to understand the environment of in International Research and Education) on acquisition of new high-resolution 3D
shallow slow slip along the Hikurangi and was funded for 5 years starting in Fall seismic reflection data across the northern
margin; a project focused on understanding 2016. E-FIRE guiding research questions are Hikurangi margin offshore of the North
dehydration in the mantle wedge and the role directly derived from white papers that the Island of New Zealand to understand slow
of fluids in intermediate-depth seismicity community developed during workshops and slip events (SSE). The data will be open access.
and mantle wedge anisotropy in Cascadia are linked to the key SCD questions in the Two linked IODP expeditions (372 and 375)
and Alaska; and an upcoming field program GeoPRISMS Science Plan. The objective of the also focus on the Hikurangi subduction
that will integrate marine geophysical data Field Institute is to investigate metamorphic margin. These drilling expeditions aim to
and geodynamic modeling of subduction rocks in the Western Alps that span from the investigate slow slip events by collecting
inititation at the Puysegur trench, New shallow to deep reaches of the subduction logging data and sampling material from the
Zealand. zone. E-FIRE partners with ZIP (Zooming sedimentary section and oceanic basement of
in between Plates), a European collaborative the subducting plate and from primary active
Allied Programs and Partner research and training project that aims to thrusts in the outer accretionary wedge; and
Organizations Updates understand processes occurring along the through installation of borehole observatories
plate interface of subduction zones. ZIP to monitor hydrologic, chemical, and physical
Terry Plank called in to give an update faculty and students led field excursions processes during the SSE cycle.
on the status of the SZ4D initiative during a 2017 field institute in the western Finally, GSOC member Danny Brothers
(previously the SZO, or Subduction Zone Alps. The samples and data from the effort summarized several USGS research activities
Observatory initiative). The SZ4D Vision are being shared among the group. The group that are strongly aligned with the GeoPRISMS
Document (https://www.iris.edu/hq/files/ will meet in summer 2018 to share research science plan. These include major efforts
workshops/2016/09/szo_16/sz4d.pdf) was results, and conduct a second field institute in focused on geophysical data acquisition along
completed in May 2017 and presented to 2019. More info about ExTerra and E-FIRE the US Atlantic margin, the Queen Charlotte
NSF. The organizing committee received can be found at: http://geoprisms.org/exterra/ Fairweather Fault System, and upcoming
input spanning OCE and EAR and was Maggie Benoit (NSF-EAR) provided an efforts at the Cascadia subduction zone, with
encouraged to continue to sharpen the focus update on EarthScope. NSF is currently three cruises planned for 2018.
on key science objectives and to move toward planning internally and having conversations
a more concrete implementation plan that with the EarthScope community through the Plans for Upcoming Meetings
might define the scope of a future program. EarthScope National Office to plan synthesis
Several presentations have been given at and integration for the program over its GeoPRISMS will be at the 2018 AGU Fall
various international meetings since then final years. The activities of the EarthScope Meeting in Washington, DC with a Townhall
(IAVCEI, GSA, AGU). The SZ4D Initiative National Office are focused on capturing the on Monday evening and planned Mini-
aims at understanding the physical and program’s legacy and facilitating synthesis and Workshops for Sunday, Dec. 9. A call for
chemical processes that underlie subduction integration through small to medium sized Mini-Workshop proposals has been sent out
zone hazards, with the goal of improving workshops, as well as via a legacy website. to the Community; the GSOC will select the
understanding of tsunamis, earthquakes, successful mini-workshop proposals in late
eruptions and landslides by capturing and In addition, the GSOC received brief updates summer. The GSOC also discussed planning
modeling emergent phenomena and by on a suite of major allied field projects at the for the upcoming Integration & Synthesis
New Zealand primary site, including the TEI scheduled for February of 2019 (see p.
collecting datasets in 4D (in real time and SHIRE project (funded by NSF-IES, with 47 of this issue). A primary objective of this
through geological time). Following an email international partners in Japan and New major workshop will be to integrate ongoing
to the GeoPRISMS Community (http:// Zealand), a 3-D seismic survey (funded work and results across themes and between
geoprisms.org/listserv-01-15-18/), many by NSF, with international partners in primary sites, with the goal of identifying
grassroots activities have been identified or Japan, the UK, and New Zealand), and advances on the cross cutting science themes
are underway, including workshops (funded multiple IODP drilling expeditions. The in the Science Plan, defining emerging
or proposed), community response, and SHIRE project (Seismogenesis at Hikurangi questions, and positioning the community
experiment proposals.
Integrated Research Experiment) aims at for new initiatives while also shaping the
Sarah Penniston-Dorland provided an understanding the mechanics governing program’s legacy over its final years. As
update on the ExTerra initiative. ExTerra is fault slip behavior along the subduction details for this major workshop materialize,
a self-organized group of geoscientists, with thrust interface by combining large-scale announcements will go out via the listserv
the aim of investigating core themes in the seismic imaging, paleoseismology and and the application portal will open on the
GeoPRISMS science plan through the study geomorphology, and numerical modeling GeoPRISMS website, so please stay tuned.

36 • GeoPRISMS Newsletter Issue No. 40 Spring 2018