Investigating subduction processes at the Hikurangi margin, New Zealand

  Kimpton Hotel Monaco
700 F Street NW, Washington, DC 20004
Athens Room
 icon-calendar Sunday December 9, 2018, 1:15 PM – 5:30 PM

Registrations are now closed. Questions should be directed to the GeoPRISMS Office at info (at)


Laura Wallace (GNS Science, New Zealand, Univ. Texas Institute for Geophysics), Dan Bassett (GNS Science, New Zealand), Heather Savage (Lamont Doherty Earth Observatory, Columbia University), Samer Naif (Lamont Doherty Earth Observatory, Columbia University), Shuo Shuo Han (Univ. Texas Institute for Geophysics), Patrick Fulton (Texas A&M University)

 icon-chevron-right Participant list (last update 12/05/18)

 icon-chevron-right Agenda (last update 12/05/18)


The Hikurangi margin offers an outstanding opportunity to address many of the key topics of GeoPRISMS Subduction Cycles and Deformation. Major international experiments to investigate subduction processes at the Hikurangi margin have taken place in the last year including two IODP drilling expeditions to investigate shallow slow slip events, and two seismic experiments with the R/V Langseth and R/V Tangaroa to investigate controls on plate coupling and slow slip.  The objectives of a Hikurangi margin mini-workshop are to discuss new observations from the New Zealand focus site and their implications for an integrated understanding of subduction processes, as well as planning for upcoming experiments.

The first half of the miniworkshop will introduce the latest results from the recent GeoPRISMS-related research efforts at the Hikurangi margin (including IODP drilling and seismic experiments), and a discussion of the implications of these for GeoPRISMS SCD questions. The second half of the miniworkshop will consist of presentations on upcoming plans for field experiments and research at the Hikurangi focus site, and discussion on coordination of these efforts. We will also discuss any research gaps that might exist. In addition to a small number of overview talks on recent and future experiments, we will offer the opportunity for a limited number of short (~2 minutes) pop-up talks on synergistic activities at the Hikurangi subduction zone.

In addition to researchers focused on the Hikurangi margin, we welcome attendees interested in subduction deformation and megathrust processes in Cascadia and Alaska, to cross-fertilize ideas and research outcomes among all three of the GeoPRISMS primary sites. Student and early-career scientist participation is also encouraged.

1:15pm | Welcome & Introductory Remarks – GeoPRISMS Chair Demian Saffer

Session 1 – Integrating observations from an unprecedented summer research at Hikurangi

1:20 – 1:35 | Paleoseismic constraints on past earthquake behaviourJamie Howarth

1:35 – 1:50 | Summary of IODP Exp 372/375Demian Saffer

1:50 – 2:05 | Summary of NZ3D – Nathan Bangs (MCS) and  Ryuta Arai and Becky Bell (wide-angle)

2:05 – 2:20 | Summary of SHIREHarm van Avendonk (offshore) and  Stuart Henrys (onshore)

2:20 – 2:35 | Parallels between Alaska and the Hikurangi margin, and synergies with activities at the Alaska Primary SiteDonna Shillington

2:35 – 3:15 | Discussion of implications for the physical controls on subduction processes

– Structure around SCD key questions, processes or domains (e.g. incoming plate, forearc, megathrust)

3:15 – 3:30 | Coffee break

Session 2 – Future plans

3:30 – 3:45 | Seafloor Observatory installation and plans for ongoing seafloor geodesy and seismologyLaura Wallace

3:45 – 4:00 | SAFFRONZ project and the interplay between hydrogeology and slow slipEvan Solomon

4:00 – 4:15 | CSEM and MT as a window into hydrogeology – Samer Naif (offshore) and Wiebke Heise (onshore)

4:15 – 4:35 | Space for 2 minute (1 slide) pop-up talks summarizing other synergistic activities

4:35 – 5:15 | Open Discussion

– What gaps in data/knowledge remain? What additional work needs to be done?