[unav_all] AGU Session: Illuminating factors that determine subduction megathrust slip style

Laura Wallace lwallace at utexas.edu
Tue Jul 15 16:34:39 MDT 2014

Dear colleagues,‬

we would like to encourage you to submit your abstracts to our session
the Factors that Determine Subduction Megathrust Fault Slip Style"* at the
2014 AGU Fall Meeting, 15-19 December, San Francisco, USA.

This session is intended be an interdisciplinary effort to discuss
potential physical controls on the diversity of fault slip behavior
observed at subduction zones. We also encourage contributions addressing
the continuum of fault slip behaviors including aseismic creep, transient
slow slip events, and slip in great megathrust earthquakes.

*Invited Speakers:*
Jean-Paul Ampuero (California Institute of Technology)
Donald Fisher (Penn State University)
Shuichi Kodaira (JAMSTEC)
Thorne Lay (University of California, Santa Cruz)

*Session details:*

"‪Illuminating the factors that determine subduction megathrust fault slip

‪The subduction thrust interface varies in fault slip style, in space and
time, through a continuum of slip velocities from steady creep to episodic
seismic slip. Geodetic and seismological studies are increasingly
illuminating the distribution of these slip styles, but the physical
controls on the seismic style of any megathrust segment remain elusive.
Several competing hypotheses exist; for example. observations and
theoretical models indicate that slow slip and tremor may require high
fluid pressures, sea floor roughness has been suggested to both promote and
inhibit large earthquakes, and high effective stress may either promote or
inhibit creep. It is clear that interdisciplinary discussion on how to test
new and existing theories is required. We invite contributions from
geodesy, seismology, numerical and analogue modeling, laboratory
experiments, and field geology, that address the rheology, frictional
properties, and physical characteristics that determine subduction
megathrust fault slip style.‬

Ake Fagereng -  University of Cape Town/Cardiff University
Matt Ikari -  MARUM, University of Bremen
Kohtaro Ujiie - University of Tsukuba
Laura Wallace -  University of Texas at Austin

The session is sponsored by Tectonophysics, and co-sponsored by Geodesy,
Minerals and Rock Physics, Natural Hazards, and Seismology.

Best regards and hope to see you in San Francisco!

Ake Fagereng, Matt Ikari, Kohtaro Ujiie, and Laura Wallace
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