Please use this identifier to cite or link to this item: http://dlib.scu.ac.ir/handle/1956/4040
Title: Multidimensional Multirate Sampling and Seismic Migration
subject: VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;Mastergrad;756199
Publisher: The University of Bergen
Description: Seismic data are usually recorded in time and space on rectangular lattices. Seismic wave propagation is described by the wave-equation, which yields a Fourier spectrum with smaller bandwidth than the rectangular periodicity allows for. Using non-rectangular, multirate, sampling lattices, it is possible to sample only the points which corresponds to propagating waves. For 2D data this technique can sample the wavefield with half the data points without introducing alias. Seismic migration is the process of inverting the recorded wavefield in time to depth. The wavefield has circular bandwidth, which is also less than the rectangular periodicity allows for. It is also shown that the linear and parabolic Radon transform have a bandwidth which is smaller than the rectangular periodicity. Fourier filtering and seismic migration algorithms are modified and performed on multirate lattices. Gazdag phase-shift and Reverse Time Migration (RTM) are implemented with multirate sampling, which makes the calculations more efficient.
Master i Geovitenskap
GEOL399
MAMN-GEOV
URI: https://bora.uib.no/handle/1956/4040
More Information: http://hdl.handle.net/1956/4040
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Multidimensional Multirate Sampling and Seismic Migration
subject: VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;Mastergrad;756199
Publisher: The University of Bergen
Description: Seismic data are usually recorded in time and space on rectangular lattices. Seismic wave propagation is described by the wave-equation, which yields a Fourier spectrum with smaller bandwidth than the rectangular periodicity allows for. Using non-rectangular, multirate, sampling lattices, it is possible to sample only the points which corresponds to propagating waves. For 2D data this technique can sample the wavefield with half the data points without introducing alias. Seismic migration is the process of inverting the recorded wavefield in time to depth. The wavefield has circular bandwidth, which is also less than the rectangular periodicity allows for. It is also shown that the linear and parabolic Radon transform have a bandwidth which is smaller than the rectangular periodicity. Fourier filtering and seismic migration algorithms are modified and performed on multirate lattices. Gazdag phase-shift and Reverse Time Migration (RTM) are implemented with multirate sampling, which makes the calculations more efficient.
Master i Geovitenskap
GEOL399
MAMN-GEOV
URI: https://bora.uib.no/handle/1956/4040
More Information: http://hdl.handle.net/1956/4040
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.
Title: Multidimensional Multirate Sampling and Seismic Migration
subject: VDP::Matematikk og Naturvitenskap: 400::Geofag: 450;Mastergrad;756199
Publisher: The University of Bergen
Description: Seismic data are usually recorded in time and space on rectangular lattices. Seismic wave propagation is described by the wave-equation, which yields a Fourier spectrum with smaller bandwidth than the rectangular periodicity allows for. Using non-rectangular, multirate, sampling lattices, it is possible to sample only the points which corresponds to propagating waves. For 2D data this technique can sample the wavefield with half the data points without introducing alias. Seismic migration is the process of inverting the recorded wavefield in time to depth. The wavefield has circular bandwidth, which is also less than the rectangular periodicity allows for. It is also shown that the linear and parabolic Radon transform have a bandwidth which is smaller than the rectangular periodicity. Fourier filtering and seismic migration algorithms are modified and performed on multirate lattices. Gazdag phase-shift and Reverse Time Migration (RTM) are implemented with multirate sampling, which makes the calculations more efficient.
Master i Geovitenskap
GEOL399
MAMN-GEOV
URI: https://bora.uib.no/handle/1956/4040
More Information: http://hdl.handle.net/1956/4040
Appears in Collections:Department of Earth Science

Files in This Item:
Click on the URI links for accessing contents.