Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2015
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| Online Access: | http://hdl.handle.net/1721.1/98669 |
| _version_ | 1826188634478346240 |
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| author | Shabelansky, Andrey Hanan |
| author2 | Alison E. Malcolm and Michael C. Fehler. |
| author_facet | Alison E. Malcolm and Michael C. Fehler. Shabelansky, Andrey Hanan |
| author_sort | Shabelansky, Andrey Hanan |
| collection | MIT |
| description | Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015. |
| first_indexed | 2024-09-23T08:02:42Z |
| format | Thesis |
| id | mit-1721.1/98669 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T08:02:42Z |
| publishDate | 2015 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/986692019-04-09T16:15:07Z Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis Shabelansky, Andrey Hanan Alison E. Malcolm and Michael C. Fehler. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences. Earth, Atmospheric, and Planetary Sciences. Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015. Cataloged from PDF version of thesis. Includes bibliographical references (pages 169-177). The recorded seismic signal contains full information about the source that generated the seismic waves and the path along which the seismic waves travel and interfere with subsurface. However, source information is not an explicit part of the seismic record and thus is a large source of uncertainty in seismic imaging and velocity analysis applications. In this thesis, we develop source-independent methods for seismic imaging, seismic trace interpolation and velocity analysis using the interference between pure (PP and SS) and converted-phase (PS and SP) waves. For seismic imaging, we develop amplitude-balancing source-independent converted-phase seismic imaging conditions and introduce a concept of conversion ratio coefficients to provide a physical and mathematical foundation for source-independent converted-phase (SICP) imaging. For seismic trace interpolation, we develop a scheme for migration/de-migration to suppress migration-based artifacts due to sparse station deployments. For velocity analysis, we present first a source-independent space-lag domain Extended SICP imaging condition (ESICP-IC). Then, we mathematically derive an optimization scheme for source independent converted-phase wave equation migration velocity analysis (SICP-WEMVA). We investigate numerically the stability and convergence of SICP-ICs, SICP interpolation and SICP-WEMVA with synthetic data. Finally, using the developed methodologies, we investigate the subsurface structure of the Hengill geothermal area in Iceland using the abundant micro-seismic activity of the region. The constructed SICP seismic images show detailed subsurface structure of the Hengill area that is well correlated with previous seismic and resistivity studies. Also, we find that the amplitudes of the images are well correlated with a low resistivity region of the geothermal area. The reason for this correlation is not fully understood, but may provide an additional tool for investigation of the Hengill site. by Andrey Hanan Shabelansky. Ph. D. 2015-09-17T19:03:32Z 2015-09-17T19:03:32Z 2015 2015 Thesis http://hdl.handle.net/1721.1/98669 920681778 eng M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 177 pages application/pdf Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Shabelansky, Andrey Hanan Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title | Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title_full | Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title_fullStr | Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title_full_unstemmed | Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title_short | Theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| title_sort | theory and application of source independent full wavefield elastic converted phase seismic imaging and velocity analysis |
| topic | Earth, Atmospheric, and Planetary Sciences. |
| url | http://hdl.handle.net/1721.1/98669 |
| work_keys_str_mv | AT shabelanskyandreyhanan theoryandapplicationofsourceindependentfullwavefieldelasticconvertedphaseseismicimagingandvelocityanalysis |