Open AccessTwo‐dimensional PP / PS ‐stereotomography: P ‐ and S ‐waves velocities estimation from OBC data
Author(s) -
Alerini M.,
Lambaré G.,
Baina R.,
Podvin P.,
Le Bégat S.
Publication year - 2007
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.2007.03439.x
Subject(s) - context (archaeology) , pairing , a priori and a posteriori , ideal (ethics) , group velocity , data set , extension (predicate logic) , geodesy , geology , physics , mathematics , optics , computer science , statistics , philosophy , quantum mechanics , paleontology , superconductivity , epistemology , programming language
SUMMARY We present the extension of stereotomography to P ‐ and S ‐wave velocity estimation from PP ‐ and PS ‐reflected/diffracted waves. In this new context, we greatly benefit from the use of locally coherent events by stereotomography. In particular, when applied to S ‐wave velocity estimation from PS ‐data, no pairing of PP ‐ and PS ‐events is a priori required. In our procedure the P ‐wave velocity model is obtained first using stereotomography on PP ‐arrivals. Then the S ‐wave velocity model is obtained using PS ‐stereotomography on PS ‐arrivals fixing the P ‐wave velocity model. We present an application to an ‘ideal’ synthetic data set demonstrating the relevance of the approach, which allows us to recover depth consistent P ‐ and S ‐waves velocity models even if no pairing of PP ‐ and PS ‐events is introduced. Finally, results to a real data set from the Gulf of Mexico are presented demonstrating the potential of the method in a noisy data context.