GeoPRISMS - EarthScope Planning Workshop
for the Cascadia Primary Site

April 5-6, 2012; Portland, OR


Conference documents (such as presentations, agendas, and participant lists) are available under the "more information" tab. 



The Cascadia margin is one of the selected GeoPRISMS primary sites for the Subduction Cycles and Deformation (SCD) Initiative and the focus of the ongoing joint EarthScope-GeoPRISMS Cascadia Initiative (CI). The first phase of the CI Amphibious Array – including both the offshore and onshore deployments - is complete. Data from the onshore deployment already are flowing and those from offshore should become available in 2012. With many other onshore and offshore research efforts in process or planning stages, it is timely to hold a workshop to build synergies among communities, disciplines, and agencies with scientific interests in the area.

This workshop will take as its starting point the Cascadia SCD portion of the GeoPRISMS Science and Implementation Plans ( and the Earthscope Science Plan ( The goals of the workshop will be to clarify common research objectives within Cascadia, addressing the range of interacting tectonic, magmatic, and surficial processes acting along the convergent margin, and to update implementation plans and timelines for GeoPRISMS and EarthScope research considering available resources and infrastructure.

Specific objectives of the workshop include:

  • Informing the broader geoscience community about the status of community experiments and new science activities and opportunities in the Cascadia area
  • Enhancing interdisciplinary interactions and collaborations in Cascadia
  • Encouraging new proponent teams to organize in advance of upcoming proposal deadlines
  • Updating the GeoPRISMS implementation plan for Cascadia, including thematic aspects of SCD science
  • Clarifying broader impacts and education opportunities associated with Cascadia research

We anticipate funding to support ~85 researchers with a diversity of interests to participate in this workshop. Post-docs, senior graduate students, and members of under-represented groups are especially encouraged to apply. Note, a student symposium is planned for April 4, before the workshop - more details will be announced soon. Applications should include a brief statement of interest and anticipated contribution to the workshop, and a short (1 to 2 page) CV.

The program will include a number of overview presentations on Cascadia and related MARGINS, GeoPRISMS, and EarthScope research programs, other major Cascadia experiments already or soon-to-be underway, break-out sessions, and plenary discussions. White papers will be solicited in advance of the workshop to ensure community input.



Workshop Conveners:

  • Geoff Abers (Lamont-Doherty Earth Observatory)
  • Joan Gomberg (USGS)
  • Adam Kent (Oregon State University)
  • Katie Kelley (University of Rhode Island)
  • Harvey Kelsey (Humboldt State University)
  • Josh Roering (University of Oregon)
  • Anne Trehu (Oregon State University)
  • Kelin Wang (Pacific Geoscience Center)
  • Andrew Goodliffe, Student Symposium Convener


A day-long symposium will be held for graduate students prior to the Cascadia Workshop.  If you are a student and wish to attend this workshop, please indicate that on your acceptance form.


Student Symposium Agenda

Download the Student Symposium Program as a PDF (updated 03/23/12)

Moderator: Andrew Goodliffe

April 4th, 2012

7:30 AM       Breakfast (at Marriott Waterfront, Room TBA)

8:00 AM       Welcome and Symposium Objectives

8:10 AM       Introduction to GeoPRISMS & EarthScope – Juli Morgan / Ramon Arrowsmith

8:30 AM       Framework geology and seismicity of Cascadia – Anne Trehu

8:50 AM       Paleoseismology, w Emphasis on Coastal Records – Harvey Kelsey

9:10 AM       Surface Processes & Feedback in Cascadia – Karl Wegmann

9:30 AM       Volcanism & Geochemical Processes in Cascadia – Adam Kent

9:50 AM       Coffee Break (and Poster Session)

10:00 AM       Student Poster Session with 2-3 min presentations at each poster

12:00 PM        Pick-up Box Lunch, head to Field Trip

12-6:00 PM   Portland Field Trip by Public Transit (or Bus; see field guide for details) - Ray Wells & Ian Madin

6:00 PM          Workshop Registration, Ice Breaker (at Marriott Waterfront)

7:00 PM          Student Dinner (at Kells Irish Restaurant and Pub)


Preliminary Workshop Program

Download the Workshop Program as a PDF (FINAL version, updated 04/4/12)

Wednesday, April 4 - Registration (and Student Symposium)


5:30 PM        Registration and Ice Breaker (at Marriot Waterfront)


Thursday, April 5 – Workshop Day 1

7:30 AM         Breakfast (at World Trade Center)


Moderators: Adam Kent, Katie Kelley

8:30 AM         Welcome from the conveners, logistics, goals for the workshop

8:45 AM         Comments from NSF representatives

9:00 AM          Cascadia Crustal Evolution and Deformation

     9:00      Evolution of the Cascadia convergent margin-an introduction- Ray Wells

     9:30      Cascadia pre-quaternary geologic context - Anita Grunder

     9:50      Holocene and recent volcanism in the Cascades – Kathy Cashman

   10:10      Discussion


10:30 AM       COFFEE BREAK


Moderators: Anne Trehu, Kelin Wang

11:00 AM        Earthquakes and Other Faulting Processes

11:00      Research on mega-thrust earthquakes in the Japan Trench and the

                 Nankai Trough- Shu-ichi Kodaira

   11:30      Paleoseismic history of Cascadia from onshore and offshore record - Rob Witter

   11:50      Seismic and aseismic processes from the modern record - Ken Creager

   12:10      Discussion

12:30-1:30       LUNCH



Moderators: Geoff Abers, Adam Kent

1:30 PM          Large-scale and Deep Processes

     1:30      Thermal-petrologic-fluid flow structure and dynamics of the subduction zones - Ikuko Wada

     2:00      Geodynamic framework of the Pacific NW - Gene Humphreys

     2:30      Structure, composition, and evolution of the incoming plate at the Cascadia Subduction ZoneSuzanne Carbotte

     3:00      Generation of magmas in Cascadia - Tom Sisson

     3:30      Discussion 

Moderators: Joan Gomberg, Anne Trehu

3:50 PM          Project Summaries: Ongoing studies in Cascadia and elsewhere (5 min each)

  •        Cascadia Initiative – offshore update - Doug Toomey
  •        Cascadia Initiative - onshore update - Richard Allen
  •        IODP studies - Rob Harris
  •        Cabled observatories, Canada – Martin Heesemann
  •        Cabled observatories, US - William Wilcock
  •        Offshore GPS - Dave Chadwell
  •        Mount St. Helens project - Alan Levander
  •        Open-access Langseth cruise: Reflection imaging of the central Cascadia margin- Katie Keranen
  •        Mocha Project – Adam Schultz
  •        GeoPRISMS Portal and MGDS - Andrew Goodwillie

4:40 PM          Poster Session

6:30 PM          CONFERENCE DINNER (at World Trade Center)

-       Earth to Humans: The importance of connecting people with their planet – Ellen Morris Bishop

8:00 PM          Poster Session w/ CASH BAR


8:00 PM          Projects and Implementation Discussions

Objective: Break-out groups to discuss existing and planned projects, activities, opportunities and future directions (90 minutes). Reports will guide closing discussions on Day 2.

  • What infrastructure exists for Cascadia; what are associated opportunities?
  • What major research products and data streams will be available?
  • What gaps remain to be filled; what are future directions?
  • What challenges exist, and how can they be overcome?

(a)   Cascadia Initiative & Amphibious Arrays – Richard Allen,Doug Toomey

(b)  Volcano Imaging – Ken Creager, Olivier Bachman

(c)   Cascadia Geohazards – Brian Sherrod, Roy Hyndman

(d)  Energy & Mineral Potential Andrew Meigs, Michael Rowe

(e)   Education & Outreach Bob Butler, Ellen Bishop

(f)   GeoPRISMS Portal and MGDS - Andrew Goodwillie


Friday, April 6 – Workshop Day 2



7:30 AM         Breakfast (at World Trade Center)

8:30 AM         Introduction to Day 2


Moderators: Josh Roering, Harvey Kelsey 

8:40 PM          Sediment Transport, Accretion, and Subduction

     8:40      Mass Balance and terrestrial surface processes - Mark Brandon

     9:10      Accretionary prism processes and comparison with other subduction zones - Lisa McNeill

     9:40      Understanding the turbidite record: genesis, transport, and preservation – David Piper

   10:10      Discussion


10:30 AM      COFFEE BREAK

11:00 PM        Special Interest Discussion Groups

Objective: Break-out groups to discuss scientific topics, targets, and research approaches, (2 sessions, 45 minutes each). Reports will guide closing discussions on Day 2.

  • What are the key exciting scientific questions that can be addressed in Cascadia?
  • What infrastructure exists in Cascadia research to address them?
  • What knowledge gaps remain to be filled; what are future research directions?
  • What challenges exist, and how can they be overcome?

11:00-11:45 AM - Session 1

(a)   Subduction Zone Structure I: Anne Sheehan, Gary Egbert (Scribe: Rob Porritt)

Deep geophysical imaging (e.g., mantle wedge, slab), passive seismic, resistivity

(b)  Faulting Processes I: David Schmidt, Harmony Colella (Scribe: Abhi Ghosh)

Megathrust processes, properties, and behaviors

(c)   Sedimentary Processes: Chris Goldfinger, Becky Dorsey (Scribe: Karl Wegmann)

Sediment transport, linkages among hillslopes, estuaries, turbidite processes, preservation of extreme events (flooding, landslides, earthquakes)

(d)                    Volcanism and Volcanic Processes: Marc Parmentier, Sue de Bari (Scribe: Alison Koleszar)

(e)                     Distribution, composition, and output through time and space, correlations with seismic record, imaging and monitoring

11:45-12:30 PM - Session 2

(a)   Subduction Zone Structure II: Tom Pratt, Helene Carton (Scribe: Lee Liberty)

Shallow imaging (forearc structure), active source, potential fields, resistivity

(b)  Faulting Processes II: Rick Blakely, Sue Bilek (Scribes: Simon Engelhart)

Margin segmentation from modern, paleoseismologic and paleogeodetic perspectives, forearc and backarc deformation, intraplate faults

Note: We recognize that there may be considerable topical overlap between a and b. At the discretion of the discussion group chairs, these may be combined into a single group.

11:45-12:30 PM - Session 2 (cont.)

(c)   Geodetic studies: Spahr Webb, Herb Dragert(Scribe: Jay Patton)

Present-day ground motions, on- and off- shore, causes and consequences

(d)  Volatile Processes and Cycles: Glen Spinelli,Stacia Gordon (Scribe: Dan Ruscitto)

Fluids and melting, from trench to arc

12:30-1:30 PM           LUNCH


Moderators: Kelin Wang, Joan Gomberg

1:30 PM          Cascadia Hazards Plenary Presentations

     1:30      Implications for the built environment – hazard mapping - Art Frankel

     1:45      Tsunami potential and modeling - George Priest

     2:00      Volcanic Hazards - Seth Moran

     2:15      Characteristics of the Earthquake Early Warning Problem in Cascadia- Ingrid Johanson

2:30 PM          Special Interest Groups Reports (5 minutes each)

3:20 PM          COFFEE BREAK


Moderators: Katie Kelley, Josh Roering

3:40 PM          Student Perspective

4:00 PM          Implementation Discussion and Roadmap to the Future

     4:00      Implementation Discussion Summaries (5-10 mins each), setting stage for

     4:30      Future Research Directions and Opportunities, e.g.,

  • What are the key exciting scientific questions that can be addressed in Cascadia?
  • What infrastructure exists for Cascadia; what are associated opportunities?
  • What major research products and data streams will be available?
  • What gaps remain to be filled; what are future directions?
  • What interdisciplinary activities / collaborations will advance understanding of Cascadia?
  • What challenges exist, and how can they be overcome?

5:30 PM          Wrap-up and Closure

6:30 PM          DINNER ON YOUR OWN


Workshop Venue: Portland World Trade Center 121 SW Salmon St, 2WTC, Portland, OR 97204  Tel:(503) 464-8688

Workshop Hotel: Portland Marriott Downtown Waterfront 1401 SW Naito Parkway, Portland, Oregon 97201

White Papers

Call for White Papers: GeoPRISMS-EarthScope Science Workshop for Cascadia

Deadline for Submission: February 20, 2012

Scientists interested in GeoPRISMS and EarthScope research in Cascadia are invited to submit White Papers in advance of the Cascadia Science Workshop. White Papers should propose specific science objectives and show suitability for addressing the research themes outlined in the GeoPRISMS and/or the EarthScope Science Plans, and for the GeoPRISMS Program, specifically the implementation plan relating to the Cascadia Primary Site

Example White Paper topics could include implementation strategies for carrying out interdisciplinary research in Cascadia, or for thematic studies complementary to such investigations.  To be most effective, White Papers should make an explicit case for how they address one of more of the key GeoPRISMS SCD questions or EarthScope and/or GeoPRISMS Science Plans.

White Papers will be made available to meeting participants and the community prior to the workshop, and will be used in the implementation strategy decision–making process during the workshop.

White Paper Listing

White Paper Listing

Below is a list of all the accepted white papers for the Cascadia Science Meeting.  Please note that all files are PDFs, and that file sizes are in megabytes and have been rounded.

You can also download the entire white paper volume as a ~2.7Mb PDF.

Authors Title Size
M. Anderson, P. Bedrosian, R. Blakely, B. Sherrod, R. Wells A focused study of Cascadia upper-plate structure and its impact on subduction-zone segmentation 0.6
C. D. Chadwell, S. C. Webb, S. L. Nooner Potential contributions of Seafloor Geodesy to understanding slip behavior along the Cascadia Subduction Zone 0.4
A. Ghosh, K. Creager, J. Vidale Long-term simultaneous imaging of slow and fast quakes using small-aperture seismic arrays 0.2
A. Goodwillie and the GeoPRISMS Data Portal Team GeoPRISMS Data Portal 0.5
B. Horton, S. Engelhart, A. Hawkes, A. Nelson, K. Wang, P.L.
Wang, R. Witter
Paleoseismology at the Central Cascadia Subduction Zone 0.1
H. P. Johnson, K. Wang, T. Bjorklund, T. McGinnis Determining Temperatures of the Eastern Edge of the Cascadia Subduction Zone: Shallow Water Heat Flow Measurements in Puget Sound 0.6
H. P. Johnson, E. A. Solomon, M. Salmi Thermal Structure of the Cascadia Subduction Zone on the Washington Margin 0.3
E. Solomon and M. Kastner Constraining Fluid Sources and Fluxes Through the Cascadia Accretionary Prism - Impact on Volatile Cycling, Physical State, and Microbiology 0.1
M. Streck, M.C. Rowe, R. Conrey, R. Duncan Volcanic arcs through time: High-resolution transects across 40 million years of arc evolution in the Oregon Cascades 0.2

Submit a White Paper

Submit Your White Paper:


  • White Papers submitted by proponent teams are preferred to ensure broader consensus, although individuals are also welcome to submit
  • Authors may contribute more than one white paper
  • White Papers should be clear and succinct and are limited to 2 pages of text plus 1 page of figures and references
  • The conveners reserve the right to restrict dissemination of papers deemed to be too narrow in scope or not aimed at the implementation plan.
  • Please provide the following header information on each paper:
    • White Paper Title
    • Authors and Affiliations
    • Contact information
    • Proposed sites and/or themes addressed
    • Key types of existing or forthcoming data/infrastructure to build upon

We're sorry, but the White Paper submission period has closed.

More Info


Poster Information

The poster boards at the World Trade Center in Portland are approximately 4ft tall by 8ft wide, please do not bring any poster larger than these dimensions.



Please note that the reimbursements for this meeting are being handled jointly by the GeoPRISMS Office and the EarthScope National Office.  Please be sure to submit your reimbursement request to the proper office!  If you submit your information to the wrong office, your reimbursement will be much delayed or may not be processed.  Be sure to keep copies of all receipts and materials for your reimbursement submission.  Information for each office's reimbursement can be found below.


EarthScope National Office Reimbursement Information

Most workshop participants are being reimbursed by the ESNO at Arizona State University.  If you are among this group, you will need to complete at least two of the three forms below:

  1. The SESE Participant Certification: if you are an American citizen, you should complete the top portion of this form.
  2. The EarthScope National Office Reimbursement Form: you should complete as much of this form as you can.  Remember to include your original receipts with your submission (and to retain copies of those receipts for yourself)!
  3. The ASU W9 form: complete this if you are an American citizen claiming more than $600.
  4. If you are not an American citizen, contact the EarthScope National Office.


Helpful Links

Workshop Information

Workshop Documents

Apply to the Workshop

Accept an Invitation

Submit a Whitepaper

Participant/Lodging list



Comparison Matrix

GeoPRISMS Science Plan

EarthScope Science Plan

Abstract Volume (PDF, ~2.8Mb)

Poster list (PDF)

Participant List (PDF)



Useful Information

GeoPRISMS Office

EarthScope National Office

Cascadia Initiative
Expedition Team

Portland Visitor's Association

Portland Mass Transit District

GeoPRISMS Reimbursements

NSF Flight
Reimbursement Information


The GeoPRISMS/EarthScope Cascadia Science Meeting is now Complete!

The Cascadia Workshop Report is now available!

 Download the Report (PDF, ~1Mb) updated 6/4/12 

cascadia group picture

The GeoPRISMS and EarthScope Natonal Offices and the conveners would like to thank all of you for contributing to a most productive Cascadia Science Workshop last week in Portland. The talks were outstanding and thought-provoking, the posters spanned the breadth of Cascadia and related science, and the special interest break-out sessions were stimulating and highly informative.  We hope that the workshop and discussions surrounding it initiated new conversations, collaborations, and projects that will drive Cascadia science forward.  The GeoPRISMS and EarthScope Offices are available to facilitate in any way we can.

The products of this workshop will include a comprehensive report of the topics addressed, along with directions for future research in Cascadia, and an updated Implementation Plan for the Cascadia Primary Site for GeoPRISMS.  The availability of these documents will be announced on the meeting website, and through the EarthScope and GeoPRISMS listservs.  Pending author's approval, the workshop presentations will also be posted on-line.  More information will be forthcoming.

In the meantime, we would like to invite you to help the organizers in a couple of ways:

  1. Please remember to submit your requests for travel reimbursements.  Unless you have been informed otherwise, please submit your paperwork to the ESNO office  Reimbursement forms can be found in the meeting packets, and also under the "More Information" tab above.
  2. Please let us know how the meeting went.  We have set up two survey pages to seek your input about the Cascadia workshop and the Student Symposium, and other suggestions you may have.  Please take a few minutes to respond, so we can plan ahead for future such events.