Learn More
[1] Does the application of seismic Born theory, as opposed to simpler ray theory, lead to an improvement in tomographic images of the Earth? In recent publications, Montelli et al. (2004a, 2004b) and van der Hilst and de Hoop (2005) among others have expressed opposite opinions. We propose a quantitative approach to the comparison of tomographic images,(More)
Computational seismology is an area of wide sociological and economic impact, ranging from earthquake risk assessment to subsurface imaging and oil and gas exploration. At the core of these simulations is the modeling of wave propagation in a complex medium. Here we report on the extension of the high-order finite-element seismic wave simulation package(More)
S U M M A R Y Global tomographic models collected in the Seismic wave Propagation and Imaging in Complex (SPICE media: a European network) model library (http://www.spicertn.org/research/planetaryscale/tomography/) share a similar pattern of long, spatial wavelength heterogeneity, but are not consistent at shorter spatial wavelengths. Here, we assess the(More)
L. Stehly,1,2 B. Fry,3 M. Campillo,1 N. M. Shapiro,4 J. Guilbert,2 L. Boschi3 and D. Giardini3 1Université Joseph Fourier, CNRS, LGIT, BP 53, 38041 Grenoble, France. E-mail: lolostehly@gmail.com 2CEA/DASE, BP 12, 91680 Bruyères-le-Châtel, France 3Institute of Geophysics, ETH Zurich, Hönggerberg HPP, CH-8093 Zurich, Switzerland 4Laboratoire de Sismologie,(More)
S U M M A R Y We implement the wave equation on a spherical membrane, with a finite-difference algorithm that accounts for finite-frequency effects in the smooth-Earth approximation, and use the resulting ‘membrane waves’ as an analogue for surface wave propagation in the Earth. In this formulation, we derive fully numerical 2-D sensitivity kernels for(More)
Cross-correlations of ambient noise averaged at two receivers lead to the reconstruction of the two-point Green's function, provided that the wave-field is uniform azimuthally, and also temporally and spatially uncorrelated. This condition depends on the spatial distribution of the sources and the presence of heterogeneities that act as uncorrelated(More)
We apply seismic interferometry to data from an OBS survey offshore Norway and show that ambient seismic noise can be used to constrain subsurface attenuation on a reservoir scale. By crosscorrelating only a few days of recordings by broad-band ocean bottom seismometers we are able to retrieve empirical Green’s Functions (EGFs) associated with surface waves(More)