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Determination of S-wave Backazimuth from a Linear Array of ReceiversNormal access

Authors: T. Fischer, L. Eisner, S. Buske and S. Shapiro
Event name: 70th EAGE Conference and Exhibition incorporating SPE EUROPEC 2008
Session: Passive Seismic/Time Migration (EAGE)
Publication date: 09 June 2008
DOI: 10.3997/2214-4609.20147853
Organisations: SPE, EAGE
Language: English
Info: Extended abstract, PDF ( 447.21Kb )
Price: € 20

Summary:
Locations of seismic events from a linear array of receivers may require determination of slowness vectors of arriving waves. In an isotropic medium, P-waves are polarized along the slowness vector, which enables direct determination of backazimuth (i.e. azimuth of a source at a receiver) from P-wave polarization. In contrast, S-waves are polarized in a plane perpendicular to their slowness vectors, which prevents direct determination of their backazimuth. We have developed a novel technique to determine the slowness vector of S-waves detected in a linear array of receivers in an isotropic medium. We combine the S-wave polarization measurements and the derivative of the S-wave slowness vector along the array to obtain the full slowness vector and backazimuth. The proposed method allows location of seismic events from a single linear array of receivers using only shear waves, which usually have much larger signal-to-noise ratio than P-waves. This technique is not affected by SV-waves, which is shown by a test on a synthetic dataset. We also test the method on two real microseismic datasets from a hydraulic fracturing treatment and show that it outperforms the backazimuth determination from P-waves and from horizontal polarization of S-waves.


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