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September 20 @ 4:00 pm - 5:00 pm CDT

Current Research in EEPS Seminar:  Robert L. Nowack

Dept. of Earth, Atmospheric, and Planetary Sciences

Abstract Title:  Virtual Green’s Functions from Seismic Redatuming, Interferometry and Noise

Abstract:

In this talk, I describe the estimation of virtual Green’s functions from seismic redatuming,

interferometry and noise.   Using interferometry, the Green’s function can be obtained by

cross-correlating seismic signals recorded at two receivers where one of the receivers is

converted into a virtual source, but this assumes that sources occur along the surrounding

boundary.   In contrast, Marchenko redatuming requires only one-sided illumination to

obtain virtual Green’s functions.  Redatuming and interferometry are first applied to

VSP data with receivers along a borehole where virtual sources are redatumed into

the subsurface to reduce the distorting effects of overburden for seismic imaging.

Applications to the imaging for carbon sequestration are then presented.  For the seismic

interferometry of ambient noise, as the distance between the receivers is decreased

cross-correlations reduce to autocorrelations, and along with temporal and spectral

shaping, this can be used to emphasize the body-wave components of the virtual

Green’s functions. The robustness of the results from ambient noise autocorrelations

is tested for several Earthscope stations in Nevada and the central US.

Details

Date:
September 20
Time:
4:00 pm - 5:00 pm
Event Category:

Details

Date:
September 20
Time:
4:00 pm - 5:00 pm
Event Category:

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