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Subwavelength Imaging using Seismic Scanning Tunneling Macroscope Field Data Example. G. Dutta , A . AlTheyab , S. Hanafy , G. Schuster. King Abdullah University of Science and Technology, Saudi Arabia. September 19, 2012. Outline. Motivation Background Theory Kaust Field Experiment
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Subwavelength Imaging using Seismic Scanning Tunneling Macroscope Field Data Example G. Dutta, A. AlTheyab, S. Hanafy, G. Schuster King Abdullah University of Science and Technology, Saudi Arabia September 19, 2012
Outline • Motivation • Background • Theory • Kaust Field Experiment • Qademah Field Experiment • Conclusions
Outline • Motivation • Background • Theory • Kaust Field Experiment • Qademah Field Experiment • Conclusions
Why is Resolution Important ? 0 km 3 km ? 0 km7 km 0 km7 km KM image Least Squares KM image
Outline • Motivation • Background • Theory • KAUST Field Experiment • Qademah Field Experiment • Conclusions
Background • Rayleigh Resolution • Abbe Resolution Z Depth • De Fornel (2001) and Jia et al. (2010) got super-resolution in optical imaging.with evanescent waves. Δx Can we achieve ??? • Schuster et al. (2012) used SSTM to get super-resolution with numerical experiments.
Outline • Motivation • Background • Theory • Kaust Field Experiment • Qademah Field Experiment • Conclusions
Seismic Scanning Tunneling Macroscope Sources r Scatterer Receivers Post-stack migration image (Schuster et al. 2012):
Seismic Scanning Tunneling Macroscope Post-stack migration image: r 0.2 0.7 0.2 0.7 S’ 0.2 0.7` Near field resolution Far field resolution
Outline • Motivation • Background • Theory • KAUST Field Experiment • Qademah Field Experiment • Conclusions
Layout of the Field Experiment Scatterer near shot 12 Line 1 Line 5 Line 4 Line 3 Line 2 Sources
Common Shot Gathers a) CSGs before putting any scatterer b) CSGs after burying a scatterer
Migration Images R R Without Scatterers With Scatterers
Resolution at full bandwidth of the data 0.6 m 1.2 m
Outline • Motivation • Background • Theory • KAUST Field Experiment • Qademah Field Experiment • Conclusions
Migration Images R R With scatterers Without scatterers Actual Source Location 15 m Trial Source Location
Migration Images R R With scatterers Without scatterers Actual Source Location Trial Source Location
Migration Image for the weaker scatterer With scatterers Without scatterers R Actual Source Location R Trial Source Location
Outline • Motivation • Background • Theory • KAUST Field Experiment • Qademah Field Experiment • Conclusions
Conclusions • Scatterers can be imaged with subwavelength resolution with SSTM. • Field data results show a super-resolution signature of . • Direct arrivals, surface waves and ground roll need to removed during preprocessing.
Acknowledgements • We would like to thank • King Abdullah University of Science and Technology • Society of Exploration Geophysicists • Chamber of Geophysical Engineers of Turkey