Thread: 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

Started: 2020-07-18 13:06:40
Last activity: 2020-07-18 13:06:40
Topics: GSA Meetings
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 https://www.sz4d.org/ 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
https://www.sz4d.org/landscapes-seascapeswithin 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 https://www.sz4d.org/ls-webinar-1 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.
https://www.sz4d.org/ls-webinar-1

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



*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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