[unav_all] Special session on subduction at the Joint Assembly in Acapulco (May 22-25, 2007)

Thorsten Becker twb at usc.edu
Sun Feb 25 16:35:05 MST 2007

Dear friends and colleagues,

Please let us remind you that the deadline for Spring AGU in Acapulco
is coming up on in less than a week on March 1, 2007 23:59 UT. We would
also like to invite you to contribute to 

T03: Untangling Subduction Zone Plate Boundary Coupling and Trench
Migration Using Multi-Scale Observations and Modeling

The detailed session description is given below. We think that the
joint assembly will be a great platform to discuss recent advances in
understanding convergent margins. Sorry for any possible double

We hope to see you in Acapulco! 


TWB for the organizing committee

Magali Billen (UC Davis, Davis CA, billen at geology.ucdavis.edu)
Jeff McGuire (WHOI, Woods Hole MA, jmcguire at whoi.edu)
Thorsten Becker (USC Los Angeles CA, twb at usc.edu)
Vladimir Kostoglodov (UNAM, Mexico City, DF,
vladimir at ollin.igeofcu.unam.mx)

Session web site: http://www.agu.org/meetings/ja07/?content=search&show=detail&sessid=77
Meeting web site: http://www.agu.org/meetings/ja07/
Abstract submission: http://submissions5.agu.org/submission/entrance.asp

T03: Untangling Subduction Zone Plate Boundary Coupling and Trench
Migration Using Multi-Scale Observations and Modeling

The deformation state of the overriding plate and thrust interface in
convergent margins has been studied for more than forty years. Yet, it
is still not entirely clear what controls the transition from uncoupled
(Marianas) to coupled (Chilean) margins. This question is intimately
related to large scale dynamic processes such as trench migration and
to regional scale issues, such as the variation of seismic coupling
along strike. Particularly, the question of what controls seismicity is
of paramount importance for society, including our host country, as
unexpected, large earthquakes have recently shown. Numerous attempts to
predict plate boundary behavior, such as expected rupture lengths,
focusing on a range of processes, from global plate motions to local,
structural features, have only been partially successful. Recent
advances including the use of geopotential fields to estimate seismic
coupling, mantle dynamics modeling of forces, temperatures, and
volatiles, as well as seismologic, geodetic and geological constraints
on all parts of the seismic cycle, provide an outstanding opportunity
to make progress. We invite contributions from seismology, geodesy,
geology, and geodynamic modeling and will focus on those studies that
try to unravel the role of a particular process in the regional or
global context. Specific topics include, but are not limited to: the
seismic gap concept, cause and consequence of structural heterogeneity,
degree of force transmission in slabs, slab and mantle wedge rheology,
the role of large scale mantle flow, temperature and volatile control
on thrust fault and mantle constitutive laws, how to properly include
important processes in numerical models, and seismological constraints
on wave speeds, attenuation, and discontinuities.

 Thorsten W Becker                 Department of Earth Sciences
 University of Southern California              p: 213.740.8365          
 Los Angeles CA 90089-0740   http://geodynamics.usc.edu/~becker

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