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SUMMARY:Seismicity triggered by fluid injection-induced aseismic slip
DTSTART:20170519T121500
DTEND:20170519T131500
DTSTAMP:20260509T103455Z
UID:e862d92f6e23b7d037c0c395b4d60a3ad0260c3582eab5ce2296864b
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Frédéric Cappa\, Géoazur laboratory\, University of N
 ice Sophia Antipolis\, France\nAbstract:\nIn the upper crust\, fluid press
 ures are known to induce both earthquakes and aseismic deformations. Howev
 er\, the mechanisms involved are poorly understood and our ability to asse
 ss the seismic hazard associated with natural and anthropogenic fluid pres
 surization remains limited. In this talk\, I will show how in-situ fluid i
 njection experiments at meter scale can contribute to improve our understa
 nding of how fluid pressure affects the different modes of fault slip and 
 what it tells about the link between seismicity\, aseismic creep and fluid
  diffusion. In our field experiments\, we directly measure fault slip and 
 seismicity induced by fluid-injection into a natural fault. The main resul
 ts indicate highly dilatant and slow ([endif]-->) aseismic slip associated
  with a 20-fold increase of permeability\, which transitions to faster sli
 p ([endif]-->) associated with reduced dilatancy and micro-earthquakes. Mo
 stly aseismic slip occurs within the fluid-pressurized zone and obeys a ra
 te-strengthening friction law. Fluid-injection primarily triggers aseismic
  slip in this experiment with micro-earthquakes\, triggered off the fluid-
 pressurized zone\, being an indirect effect mediated by aseismic creep.\n
  \n \nShort Bio:\nI am Professor of Geophysics at the University of Nice
  Sophia Antipolis (France) in the Geoazur laboratory.\nAfter a PhD in Hydr
 omechanics (Univ. of Nice Sophia Antipolis) in 2005\, I did a 2-year Post-
 doc at the Lawrence Berkeley National Laboratory (DOE Fellowship). In 2007
 \, I held an Associate Professor position at the University of Nice Sophia
 -Antipolis in the Geoazur Earth and Planetary Sciences Laboratory. Since 2
 015\, I am full Professor at the University of Nice Sophia Antipolis and a
 t the Institut Universitaire de France. In 2013-2014\, I was visiting Facu
 lty for a year at CALTECH (USA) in the Tectonics Observatory (collaboratio
 ns with Jean-Philippe Avouac and Pablo Ampuero). My research aims at a bet
 ter understanding of the role of fluids in the mechanisms governing crusta
 l fault and landslide dynamics\, the physics of earthquakes and induced se
 ismicity. I am interested in developing new approaches combined from geoph
 ysical observations and hydromechanical modelling for the study of couplin
 g between fluid flow and rock deformations.\n 
LOCATION:GCB330 http://plan.epfl.ch/?lang=fr&room=GCB330
STATUS:CONFIRMED
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