GSA Session T24: Building the SZ4D Landscapes and Seascapes Theme: Geomorphic Change and Crustal Deformation from the Volcanic Arc, across the Forearc, and to the Trench

Nathan Niemi naniemi at umich.edu
Sat Jul 18 17:02:50 UTC 2020


Please consider a submission to the GSA 2020 Connects Online Annual Meeting session on Building the SZ4D Landscapes and Seascapes Theme: Geomorphic Change and Crustal Deformation from the Volcanic Arc, across the Forearc, and to the Trench

SZ4D is a new initiative in the U.S. research community to study subduction zones – the places where tectonic plates converge and collide – through both space and time, with a focus on the fundamental processes underlying geologic hazards such as great earthquakes, tsunamis, landslides, and volcanic eruptions.

The Landscapes and Seascapes: Surface Processes & Subduction Theme within SZ4D seeks to understand the subduction-zone related processes that play a central role in shaping the land- and sea-scapes along convergent plate margins, including upper-plate faulting, impacts of volcanism, surface processes, including tsunamis, storms, and earthquake-induced mass wasting, sediment transport and deposition, and connections between onshore and offshore near-surface processes. Key questions that this group seeks to address and develop plans to assess through the implementation of SZ4D are

Can we anticipate the impacts of great subduction zone earthquakes and volcanic eruptions on sediment generation and transport across landscapes and seascapes?

• What are the fundamental controls on the initiation and runout of landslides, turbidity currents, and volcanic mudflows?
• How do surface processes produce cascading and persistent impacts as material is transported across the land- and sea-scape?


What fraction of a subduction zone’s energy budget goes into building and shaping subduction zone land- and seascapes?

• How much permanent deformation is absorbed in the forearc and what factors control this?
• How do upper plate structures that modify land- and seascapes contribute to subduction zone hazards?


Understanding surface processes and their cascading impacts have enormous practical importance because they pose substantial risks to the ecosystems, communities, and infrastructure within subduction-zone land- and seascapes.  Despite this, we still lack understanding of the controls on the amount of subduction-zone convergence that is taken up between the trench and arc, when catastrophic surface disturbances might be initiated, where the detritus produced by these events might go, and how long and far the cascading impacts that are produced by these disturbances might extend.  This webinar provides information on the SZ4D Landscapes and Seascapes Working Group, charge, vision, and planning process.

We welcome contributions from anyone interested in hazards, deformation, and surface processes at subduction zones.  Learn more about the SZ4D Landscapes and Seascapes Working Group and vision from this webinar.


Abstracts are due August 4th! Abstract submission portal: https://gsa.confex.com/gsa/2020AM/cfp.cgi

Thanks,

Juliet Crider, Karen Gran, Kristen Morell, Nathan Niemi

T24. Building the SZ4D Landscapes and Seascapes Theme: Geomorphic Change and Crustal Deformation from the Volcanic Arc, across the Forearc, and to the Trench

Endorser(s):
GSA Structural Geology and Tectonics Division; GSA Quaternary Geology and Geomorphology Division; GSA Marine and Coastal Geoscience Division; GSA Sedimentary Geology Division; GSA Environmental and Engineering Geology Division

Rationale:
The SZ4D initiative aims to implement coordinated community experiments that capture the four dimensional evolution of subduction processes that underlie geologic hazards and drive the evolution of the solid earth and its surface. Land- and sea- scapes span the volcanic arc to the megathrust, and facilitate mass transport between them. Understanding these key systems serves to simultaneously advance fundamental science and human resilience to the hazards produced within subduction-zone land- and sea-scapes. Among the three SZ4D themes, the Landscapes and Seascapes group seeks broad input from the international community to help develop and design research initiatives that address the following questions: Can we anticipate the impacts of great subduction zone earthquakes and volcanic eruptions on sediment generation and transport across landscapes and seascapes? What are the fundamental controls on the initiation and runout of landslides, turbidity currents, and volcanic mudflows? How do surface processes produce cascading and persistent impacts as material is transported across land- and sea- scape interface? What fraction of a subduction zone’s energy budget goes into building subduction zone topography and bathymetry? How much permanent deformation is absorbed in the forearc? How do upper plate structures that modify land- and sea-scapes contribute to subduction zone hazards?

Description:
This SZ4D session highlights ongoing research across a range of geoscience disciplines that further our understanding of the processes that drive topographic change, influence sediment flux, and generate related hazards in subduction settings, on- and off-shore.


**I am primarily working from home.  My regular hours will be 9:30 - 6:00 M-F, contingent on children, dogs, cabin fever, and how sunny it is outside. E-mail is the preferred method of communication.  Voicemails left at my office will be forwarded to e-mail.**

Nathan Niemi
Professor and Director, Camp Davis Field Station
University of Michigan | Earth and Environmental Sciences
1100 N. University Avenue, Ann Arbor, MI 48109, USA
phone: +1 734.764.6377; email: naniemi at umich.edu
http://www.earth.lsa.umich.edu/~naniemi/
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