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What can earthquake focal mechanisms tell us about slab tear?

What can earthquake focal mechanisms tell us about slab tear?. Maxwell Rudolph, Eh Tan, Jeniffer Masy , Iain Bailey, Rob Porritt Faculty Adviser: Alan Levander. Motivation. Which modes of slab tear appear to be actively occurring? Can we map slab tears using earthquake moment tensors?.

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What can earthquake focal mechanisms tell us about slab tear?

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  1. What can earthquake focal mechanisms tell us about slab tear? Maxwell Rudolph, Eh Tan, JenifferMasy, Iain Bailey, Rob Porritt Faculty Adviser: Alan Levander

  2. Motivation Which modes of slab tear appear to be actively occurring? Can we map slab tears using earthquake moment tensors?

  3. Proposed Work 1) Compare summed earthquake focal mechanisms with stresses predicted from highly idealized numerical models around tears of different modes and with velocity anomalies in tomographic models 2) Attempt to understand kinematics and dynamics of ongoing tear near Venezuela in context of focal mechanisms and tomography from Levander group . Hale et al. Tectonophysics 2009 Bezada et al. 2010

  4. Iain Bailey’s work South America CMTs Compute average CMT orientation in local slab coordinate system Red show T-axes, blue show P-axes Background is MIT tomography evaluated at the slab contours

  5. South America CMTs Rotation of CMTs

  6. CIDER has provided funding for several days of face-to-face collaboration for the whole group in Houston next month.

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