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SUMMARY:Faults in a poroelastic solid: Towards understanding the complex c
 oupling of slip and pore-pressure changes - Elias Heimission (Caltech/ETH 
 Zurich)
DTSTART:20210303T160000Z
DTEND:20210303T170000Z
UID:TALK155299@talks.cam.ac.uk
CONTACT:Tim Greenfield
DESCRIPTION:Slip on faults is often modeled or simulated assuming that the
  surrounding host rock is purely elastic. However\, it is generally unders
 tood that the crust is a porous\, fluid-filled medium and thus could be be
 tter described as poroelastic. Recently there has been considerable intere
 st in the relationship between fault slip and changes in pore-pressure thr
 ough various processes such as dilatancy and fluid-injection. Such investi
 gations require treating the crust as poroelastic if the goal is to achiev
 e a self-consistent framework for simulating the complex coupling of slip 
 and pore-pressure changes with the surrounding host rock.\n\nThe talk will
  have two main parts. First\, I will review the fundamental concepts and t
 heories that enable us to simulate the entire spectrum of slip behavior on
  faults during the seismic cycle.  Second\, I will apply these concepts to
  analyze and simulate slip on a fault embedded in a poroelastic medium\, w
 here I account for the fully coupled dilatancy of the fault gouge. I start
  by using a linearized stability analysis to gain insight into this couple
 d and non-linear system. I identify a previously unknown stabilizing mecha
 nism associated with the expansion of the fault through dilatancy. Further
 \, I generalize the stability results of Segall and Rice (1995) to a poroe
 lastic continuum. Finally\, I show simulations using a novel spectral boun
 dary integral formulation. I solve the coupled problem of a fault undergoi
 ng simultaneous pore-pressure changes from dilatancy and fluid injection. 
 I systematically vary the injection rate but maintain a constant injection
  volume to investigate how different injection strategies affect the nucle
 ation time of events. The results indicate that the nucleation time depend
 s strongly on the injection rate\, but the ultimate size of the earthquake
  only modestly depends on the injection rate for the simple injection stra
 tegy explored.
LOCATION:ONLINE - Details to be sent by email
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