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In this Issue                         From the Chair

                                                                   I am pleased to introduce the Spring 2019 issue of the GeoPRISMS
                                                                   newsletter. As has been our custom, the Spring edition will be
                                                                   distributed in print and be available online; unlike previous
                        Message from the                           years, we will forgo the Fall issue of the newsletter this year,
                        Chair & NSF Updates                        in preparation for a special extended format Spring 2020 issue
                                                                   that will focus on the extraordinary legacy of the GeoPRISMS
                                         2                         Program, and on synthesis and integration of science at primary
                                                sites and on cross-cutting themes. I invite you to bring your ideas for content to us, or
                                                volunteer to contribute to an article. Email the office at!
           −20˚  0˚  20˚  40˚  60˚              We are fortunate to have an exciting set of science pieces and report from the field in
                        Science Spotlight -
         40˚          40˚
                    AP  Structure of the upper   the current edition, featuring summaries of ongoing projects in the Aleutians and EARS
         20˚  West African  Metacraton  20˚
                   AF                           primary sites, and a report from the field from the HT-RESIST (regional EM survey) of
                   MER  mantle beneath the
         0˚           0˚
                Congo  VVP TC
                Craton  RVP  EARS Focus Site    the Hikurangi margin in New Zealand. In keeping with recent tradition, all of these pieces
                  LR MR
         −20˚    OR   −20˚
                 KpC                            are authored by early career investigators. This issue also includes a number of updates
         −40˚         −40˚                      on Fall 2019 AGU mini-workshops and student awards, descriptions of newly funded
           −20˚  0˚  20˚  40˚  60˚
                                                GeoPRISMS projects, and announcements about upcoming opportunities.
                        Science Spotlight - How   The past year has again been a highly active time for the GeoPRISMS office, steering &
                        subduction dynamics     oversight committee (GSOC), and the community. At the Fall AGU meeting in Washington
                        influence volatile-
                        bearing magmas          DC, we sponsored two mini-workshops (p. 32 and 34) and hosted our usual community
                                                forum event. The workshops included a morning session on investigating arc construction
                                        10      via the study of exhumed terranes, and an afternoon session on the broad range of ongoing
                                                and recent studies of the Hikurangi margin. As always, the meeting itself was also marked
                        Report from the Field -   by numerous special sessions of interest to – and inspired by - the GeoPRISMS community.
                        Hikurangi Trench EM     This February, the community gathered for a major theoretical and experimental institute
                        Survey HT-RESIST        (TEI) held in San Antonio TX, focused on synthesis and integration (p. 20). The meeting
                                       14       provided an opportunity to assess progress on cross cutting themes in the science plan,
                                                to bring investigators together to identify outstanding and emerging questions that span
                                                primary sites, and to galvanize the community as we look forward to new opportunities.
                                                Thanks to Katie Kelley, Harm Van Avendonk, and the convener team for their monumental
                        Report - 2019           effort in organizing this important meeting!
                        GeoPRISMS Synthesis
                        and Integration TEI     I’d also like to thank the GSOC for their continued contributions to GeoPRISMS science,
                                        20      planning, and outreach activities. In addition to our annual GSOC meetings, the committee
                                                works behind the scenes to provide guidance to the office and to facilitate a wide range
                                                of community-led activities. As the GeoPRISMS program ramps down, the office will be
                                                scaling back our activities into the next year. The office itself will operate at a reduced level
                        GeoPRISMS Data          from November 2019 through October 2020, with a focus on ensuring the legacy of science
                        Portal Report           and accessibility of data generated through the MARGINS and GeoPRISMS programs,
                                        28      and on positioning the community for new opportunities. To that end, we will hold two
                                                AGU mini-workshops this year aimed at taking the next key steps toward integration,
                                                synthesis, and bringing the community together to build upon the success of GeoPRISMS.
                                                These workshops will be organized around key themes identified during the 2019 TEI,
                                                coordinated by the GSOC, and led by early career scientists.
                                                I look forward to the next several months as we enter this exciting next phase of the
                                                program - that of identifying future opportunities, assessing progress on key questions, and
                                                bringing the community together to integrate results that speak to fundamental processes on
    The GeoPRISMS Newsletter is published twice   continental margins. I hope to hear from you, and to see you at our upcoming AGU events!
    a year and is designed to provide summaries                                                          Demian Saffer
    of recent GeoPRISMS activities and meetings,                                              Chair, GeoPRISMS Program
    synthesis articles, editorials, and discussion of   Cover Photograph: Rough seas off New Zealand’s North Island during the HT-RESIST cruise, in
    science opportunities. Archives of the Newsletter                                   December 2018. Photo credit: Kerry Key.
    are available on the GeoPRISMS website.                                                Newsletter Production: Anaïs Férot

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