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Analysis of PS-to-PP amplitude ratios for seismic reflector characterisation: method and application
Sponsors
I.N.G.V.
Language
English
Obiettivo Specifico
1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
Status
Published
Peer review journal
No
Issued date
2007
Series/Report No.
INGV- DPC/V4 PROJECT V4: TASK 2
Keywords
Abstract
Elastic parameters derived from seismic reflection data provide
information on the lithological contrast at an interface and support the geological
interpretation.We present a method to estimate elastic parameter contrasts
at a given interface in a 1-D layered medium from PS-to-PP amplitude ratios.
The method is applied to synthetic data to demonstrate its possibilities and limitations.
First results for real data acquired in the Campi Flegrei caldera (southern
Italy) reveal a gas-bearing layer at around 3 km depth and indicate a strong
negative velocity contrast at 7.5 km depth, possibly related to the presence of
partial melt.
information on the lithological contrast at an interface and support the geological
interpretation.We present a method to estimate elastic parameter contrasts
at a given interface in a 1-D layered medium from PS-to-PP amplitude ratios.
The method is applied to synthetic data to demonstrate its possibilities and limitations.
First results for real data acquired in the Campi Flegrei caldera (southern
Italy) reveal a gas-bearing layer at around 3 km depth and indicate a strong
negative velocity contrast at 7.5 km depth, possibly related to the presence of
partial melt.
References
Auger, E., Virieux, J., and Zollo, A. (2003). Locating and quantifying the seismic discon-tinuities in a complex medium through the migration and AVA analysis of reflected andconverted waves: an application to the Mt. Vesuvius volcano. Geophysical Journal International, 152(2), 486-496.Avseth, P., Mukerji, T., and Mavko, G. (2005). Quantitative seismic interpretation:Applying rock physics tools to reduce interpretation risk. Cambridge University Press,Cambridge, UK.Vanorio, T., Virieux, J., Capuano, P., and Russo, G. (2005). Three-dimensional seismictomography from P wave and S wave microearthquake travel times and rock physicscharacterization of the Campi Flegrei Caldera. Journal of Geophysical Research, 110,B03201, doi:10.1029/2004JB003102.Veire, H. H. and Landrø, M. (2006). Simultaneous inversion of PP and PS seismic data.Geophysics, 71(3), R1-R10.Zoeppritz, K. (1919). Erdbebenwellen VII b: über Reflexion und Durchgang seismischerWellen durch Unstetigkeitsflächen. Nachrichten von der Gesellschaft der Wissenschaften zu Göttingen, Mathematisch-Physikalische Klasse, 1919, 66-84.Zollo, A., Judenerc, S., Auger, E., D'Auria, L., Virieux, J., Capuano, P., Chiarabba, C., deFranco, R., Makris, J., Michelini, A., and Musaccio, G. (2003). Evidence for the buriedrim of Campi Flegrei caldera from 3-d active seismic imaging. Geophysical ResearchLetters, 30(19), 2002, doi:10.1029/2003GL018173.
Type
report
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