P- and S-wave attenuation estimates of stacked basalt flows in the North Atlantic Margin
We present compressional (P-) and converted shear (S-) wave attenuation estimates (Q-values) obtained from near zero-offset VSP recordings through stacked basalt flows in the North Atlantic volcanic margin. The estimates are calculated with the classical spectral ratio method and root-mean-square am...
| Published in: | SEG Technical Program Expanded Abstracts 2011 |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
SEG
2011
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| Subjects: | |
| Online Access: | http://eprints.esc.cam.ac.uk/2227/ http://eprints.esc.cam.ac.uk/2227/1/210_Schuler_et_al_SEG2011.pdf https://doi.org/10.1190/1.3628135 |
| Summary: | We present compressional (P-) and converted shear (S-) wave attenuation estimates (Q-values) obtained from near zero-offset VSP recordings through stacked basalt flows in the North Atlantic volcanic margin. The estimates are calculated with the classical spectral ratio method and root-mean-square amplitude technique. Effective attenuation estimates of 15–26 and 14–16 are obtained for P- and S-waves, respectively. This is one of the first shear wave attenuation estimates from a stacked basalt formation. Synthetic modeling reveals that seismic attenuation in the stacked basalt flow sequence is mainly caused by scattering, corresponding to Qscat = 27–29 for P- and S-waves where intrinsic energy absorption is small. ©2011 Society of Exploration Geophysicists |
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