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SUMMARY:3D fault architecture controls the dynamism of earthquake swarms -
  Prof Zachary Ross (CalTech)
DTSTART:20201001T140000Z
DTEND:20201001T150000Z
UID:TALK151387@talks.cam.ac.uk
CONTACT:Oliver Shorttle
DESCRIPTION:The vibrant evolutionary patterns made by earthquake swarms ar
 e incompatible with standard\, effectively two-dimensional (2D) models for
  general fault architecture. We leverage advances in earthquake monitoring
  with a deep-learning algorithm to image a fault zone hosting a 4-year-lon
 g swarm in southern California. We infer that fluids are naturally injecte
 d into the fault zone from below and diffuse through strike-parallel chann
 els while triggering earthquakes. A permeability barrier initially limits 
 up-dip swarm migration but ultimately is circumvented. This enables fluid 
 migration within a shallower section of the fault with fundamentally diffe
 rent mechanical properties. Our observations provide high-resolution const
 raints on the processes by which swarms initiate\, grow\, and arrest. Thes
 e findings illustrate how swarm evolution is strongly controlled by 3D var
 iations in fault architecture.
LOCATION:https://zoom.us/j/93818634948
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