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CATEGORIES:Isaac Newton Institute Seminar Series
SUMMARY:Non-periodic homogenization for seismic forward an
d inverse problems - Yann Capdeville (CNRS (Centr
e national de la recherche scientifique)\; Univers
itÃ© de Nantes)
DTSTART;TZID=Europe/London:20160413T143000
DTEND;TZID=Europe/London:20160413T153000
UID:TALK65460AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/65460
DESCRIPTION:The modeling of seismic elastic wave full waveform
in a limited frequency band is now well establish
ed with a set of efficient numerical methods like
the spectral element\, the discontinuous Galerking
or the finite difference methods. The constant in
crease of computing power with time has now allow
the use of seismic elastic wave full waveforms in
a limited frequency band to image the elastic prop
erties of the earth. Nevertheless\, inhomogeneitie
s of scale much smaller the minimum wavelength of
the wavefield associated to the maximum frequency
of the limited frequency band\, are still a challe
nge for both forward and inverse problems. In this
work\, we tackle the problem of elastic propertie
s and topography varying much faster than the mini
mum wavelength. Using a non periodic homogenizatio
n theory and a matching asymptotic technique\, we
show how to compute effective elastic properties a
nd local correctors and how to remove the fast var
iation of the topography. The implications on the
homogenization theory on the inverse problem will
be presented.
LOCATION:Seminar Room 2\, Newton Institute
CONTACT:INI IT
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