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SUMMARY:Seismic Interferometry - New Theory and Applications - Prof Andrew
  Curtis\, University of Edinburgh 
DTSTART:20140219T160000Z
DTEND:20140219T170000Z
UID:TALK50549@talks.cam.ac.uk
CONTACT:David Al-Attar
DESCRIPTION:Usually seismic interferometry is used to perform seismic tomo
 graphy of the Earth's subsurface using only background vibrational noise. 
 Seismometers can be turned into virtual (imagined) sources of energy that 
 produce real seismograms. Real energy sources (e.g.\, earthquakes or activ
 e-source seismic shots) can also be turned into virtual seismometers perha
 ps deep inside the solid Earth. Interferometry also provides novel schemas
  for computational modelling of acoustic\, elastic and electromagnetic phe
 nomena\, and embodies completely new Optical Theorems of Physics.\n\nIn th
 is talk I will focus on some of the most recent interferometric advances u
 sing the theory of Source-Receiver Interferometry (SRI). SRI allows us to 
 record earthquake seismograms on seismometers that were installed (perhaps
  years) after the earthquake occurred - a result that can be generalised t
 o acoustic\, electromagnetic\, electro-kinetic and a range of other phenom
 ena. This offers the benefit of hindsight in observational science since r
 eceivers can be physically installed in the knowledge of where an event of
  interest has taken place\, and recordings of the event can still be obtai
 ned. SRI also provides new generalised\, nonlinear methods to form seismic
  images of the Earth's interior using active sources. In addition\, SRI le
 ads to data-driven methods to decompose observed multiply-scattered wavefi
 elds into their constituent inter-scatterer components. I will introduce t
 he theory of SRI\, then these various results\, and will discuss their app
 lications and implications.\n\n\nASSOCIATED REFERENCES:\n\nA. Curtis\, Y. 
 Behr\, E. Entwistle\, E. Galetti\, J. Townend\, S. Bannister\, 2012. The b
 enefit of hindsight in observational science: retrospective seismological 
 observations. Earth and Planetary Science Letters\,vol. 345-348\, pp. 212-
 220\n\nA. Curtis and D. Halliday\, 2010. Source-receiver wave field interf
 erometry. Physical Review E\, Vol.81\, No.4\, pp. 046601-1 - 046601-10. do
 i: 10.1103/PhysRevE.81.046601\n\nE. Galetti and A. Curtis\, 2012. Generali
 sed receiver functions and seismic interferometry. Tectonophysics. doi: 10
 .1016/j.tecto.2011.12.004\n\nD. Halliday and A. Curtis. An interferometric
  theory of source-receiver scattering and imaging. Geophysics\, Vol.75\, N
 o.6 pp.SA95–SA103. doi: 10.1190/1.3486453\n\nS. King\, A. Curtis and T. 
 Poole\, 2011. Interferometric velocity analysis using physical and nonphys
 ical energy. Geophysics\, Vol.76\, No.1\, pp. SA35-SA49\, doi: 10.1190/1.3
 521291\n\nS. King and A. Curtis\, 2012. Suppressing nonphysical reflection
 s in Green's function estimates using source-receiver interferometry. Geop
 hysics\, 77(1)\, pp. Q15-Q25. doi: 10.1190/GEO2011-0300.1\n\nM. Ravasi and
  A. Curtis. Nonlinear scattering based imaging in elastic media: theory\, 
 theorems and imaging conditions. Geophysics 78(3)\, pp. S137–S155\, doi:
 10.1190/GEO2012-0286.1\n
LOCATION:Marine/Wolfson Building lecture hall
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