Slowness-backazimuth weighted migration: A new array approach to a high-resolution image
| العنوان: | Slowness-backazimuth weighted migration: A new array approach to a high-resolution image |
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| المؤلفون: | Tadashi Kito, Christine Thomas, Andreas Rietbrock |
| المصدر: | Geophysical Journal International. 169:1201-1209 |
| بيانات النشر: | Oxford University Press (OUP), 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Geophysics, Geochemistry and Petrology, Seismic array, Resolution (electron density), Classification of discontinuities, Geodesy, Slowness, Synthetic data sets, Seismology, Energy (signal processing), Geology, Weighting, Image (mathematics) |
| الوصف: | SUMMARY We have developed a new array method combining conventional migration with a slownessbackazimuth deviation weighting scheme. All seismic traces are shifted based on the theoretical traveltime of the scattered wave from specific gridpoints in a 3-D volume. Observed slowness and backazimuth are calculated for each raypath and compared with theoretical values in order to estimate slowness and backazimuth deviations. Subsequently, stacked energy calculated by a conventional migration method is weighted by the slowness and backazimuth deviations to suppress any arrival energy whose slowness and backazimuth are inconsistent with the expected theoretical values. This new method was applied to two P-wave data sets which comprise (1) underside reflections at the 410 and 660 km mantle discontinuities and (2) D �� reflections as well as their corresponding synthetic data sets. The results show that the weighting scheme dramatically increases the resolution of the migrated images and enables us to obtain wellconstrained, focused images, making upper-mantle discontinuities and D �� reflections more |
| تدمد: | 1365-246X 0956-540X |
| DOI: | 10.1111/j.1365-246x.2007.03379.x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::077f847aa91ca83dbf662f5e354acb4e https://doi.org/10.1111/j.1365-246x.2007.03379.x |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........077f847aa91ca83dbf662f5e354acb4e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1365246X 0956540X |
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| DOI: | 10.1111/j.1365-246x.2007.03379.x |