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VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:Mechanical behavior of fluid-induced earthquakes
DTSTART:20201210T121500
DTEND:20201210T131500
DTSTAMP:20260928T154802Z
UID:f7b3d4c4ae6eede8a8a004ae250bc56dd4aa65111654d832d11ce269
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Marie Violay\,  Laboratory of Experimental Rock Mechanic
 s\, EPFL Lausanne  \nAbstract: Fluids play an important role in fault zo
 ne and in earthquakes generation. Fluid pressure reduces the normal effect
 ive stress\, lowering the frictional strength of the fault\, potentially t
 riggering earthquake ruptures. Fluid injection induced earthquakes (FIE) a
 re direct evidence of the effect of fluid pressure on the fault strength. 
 In addition\, natural earthquake sequences are often associated with high 
 fluid pressures at seismogenic depths. Although simple in theory\, the mec
 hanisms that govern the nucleation\, propagation and recurrence of FIEs ar
 e poorly constrained\, and our ability to assess the seismic hazard that i
 s associated with natural and induced events remains limited. Here we stud
 y the role of pore fluid pressure on fault mechanical behavior during the 
 entire seismic cycle. i.e.\, strain rates from ~10-9/s (fault creep) to ~1
 03/s (co-seismic slip). We reproduced at the scale of the laboratory minia
 ture injection experiments. The velocity of the rupture propagation front\
 , fault slip\, dynamic stress drop and acoustic emission were recorded wit
 h a state of-the-art monitoring system. We demonstrated that the nature of
  seismicity is mostly governed by the initial stress level (i.e pore fluid
  pressure) along the faults and that the dynamic fault weakening depends o
 n both fluid rheology and thermodynamic.
LOCATION:http://swissmechseminars.ch https://ethz.zoom.us/j/94817809233?pw
 d=N0pzbnQwSFFTQnVPcVR3SkNrd29OQT09
STATUS:CONFIRMED
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