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SUMMARY:Rheology of the deep subduction interface and its role in influenc
 ing short term seismic style and long-term subduction dynamics.  - Whitney
  Behr - ETH Zurich
DTSTART:20200219T160000Z
DTEND:20200219T170000Z
UID:TALK137413@talks.cam.ac.uk
CONTACT:Jenny Jenkins
DESCRIPTION: I'll be presenting work my students and I have been doing to 
 better understand the mechanical behavior of subduction interface shear zo
 nes over both the short timescales of seismic behavior and the long timesc
 ales of geodynamic plate motions.  I will use observations from both the f
 ield and lab to demonstrate that interface rheology is highly sensitive to
  the ratio of sediment to mafic rocks that are subducted to depth.  In con
 sidering short timescales\, I'll show how mixed sediment-mafic rock interf
 aces generate heterogeneous shear zones that may produce seismic behaviors
  that resemble episodic tremor and slow slip.  In considering longer times
 cales\, I'll demonstrate how the viscosity contrast between sediment and m
 afic rocks affects subduction plate speeds and sets up potential connectio
 ns between Earth's interior dynamics and surface processes that influence 
 sediment delivery to the seafloor.\n\nReferences:\nBehr and Becker\, 2018.
  Sediment control on subduction plate speeds\, Earth and Planetary Science
  Letters\nBehr et al.\, 2018. Dehydration-induced rheological heterogeneit
 y and the deep tremor source in warm subduction zones\, Geology 
LOCATION:Marine/Wolfson Building lecture hall\, Bullard Labs.
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