Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 329 for “"Seismic data"”.
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Seismic data decomposition using sparse dictionary
Spectrum decomposition methods map 1D seismic trace into 2D plane of time and frequency. The decomposed frequency components of seismic trace are widely used to quantitatively predict the thickness of thin layers. The current popular time-spectrum analysis methods include the Short Time Fourier …
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Wavelet transform analysis of seismic data
Not available
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Processing of randomly obtained seismic data
Thesis (S.M. in Geosystems)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1998.
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Stress and strain from reflection seismic data
… stratigraphy solely based on 3D reflection data, and the initial work for a similar approach for ductile evaporites is presented. For the determination of paleostress, knowledge of the orientation and slip direction of the individual faults in the set is required. Both in field and seismic …
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Extracting Polar Anisotropy Parameters from Seismic Data
… approximations, and a wavelet extracted from the seismic data, to get synthetic seismic data. Compared with real seismic data, these synthetic data are scaled differently, and ignore many propagation effects. Conventionally, the seismic data are normalized to the isotropic synthetic data for …
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Velocity and Q from reflection seismic data
… of conventional reflection seismology data result in a system of linear equations of the form AX = B, with A the design matrix, X the solution vector, and B the data vector. The system of normal equations is AᵀAX = AᵀB where the least-squares estimate of X = X = V(1/S)UᵀB and the SVD of …
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Seismic Data Processing and Interpretation via Deep Learning
… (DL) algorithms are growing in popularity in seismic data processing and interpretation due to their efficiency and the ability to deal with non-linear problems. My dissertation focuses on developing new algorithms and workflows for seismic data processing and interpretation by using DL …
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HRVA - a velocity analysis technique for seismic data
… subsurface-velocity energy spectrum from gated seismic data which has been normal-moveout corrected. All calculations are performed in the frequency-space or frequency-wavenumber domain; seismic gates are transformed from the time-space domain via the Fast Fourier Transform algorithm. HRVA is …
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Imaging of large offset ocean bottom seismic data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1991.
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Enhancing land seismic data with compressive sensing and processing
Active-source seismic methods can provide a wealth of information about the structural and stratigraphic makeup of the subsurface as well as about physical and reservoir properties of rocks. However, high-resolution imaging subsurface techniques are challenging to apply for land seismic data. …
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Multicomponent seismic data analysis in the tau-p domain
… the processing of ocean bottom seismograph (OBS) data. I develop two versions of the discrete Radon transform (DRT) pair, a generalization of slant stacking, which can handle data unevenly spaced in both offset (x) and ray parameter (p). The discrete Radon transform matrix consists of two parts: a …
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Autocorrelation Analysis of the Seismic Data Recorded on Mars
… structure is discovered by analysis of seismic signals recorded by large seismograph arrays deployed worldwide. The InSight (Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport) lander carried one seismic station to Mars at the end of 2018, providing the …
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Modeling the Near-Surface Using High-Resolution Seismic Data
… the near-surface represents a major challenge in seismic exploration. For accurate deep subsurface reservoir imaging, an accurate near-surface velocity model is required. In this dissertation, I review the regional geology and geomorphology and the existing methods used for velocity modeling. A …
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Enhancing land seismic data with compressive sensing and processing
Active-source seismic methods can provide a wealth of information about the structural and stratigraphic makeup of the subsurface as well as about physical and reservoir properties of rocks. However, high-resolution imaging subsurface techniques are challenging to apply for land seismic data. …
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Global investigation of large earthquakes using long-period seismic data
… SCARDEC source parameters explain normal mode data as well as GCMT, and that SCARDEC dip angles explain body wave data similarly or slightly better than GCMT solutions. SCARDEC dip angles also agree well with results from previous individual earthquake studies and with geophysical subduction …
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Nonlinear waveform tomography : theory and application to crosshole seismic data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1993.
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Discrimination and Enhancement of Fracture Signals on Surface Seismic Data
… on seismograms as discrete events.A number of data processing workflows were designed and examined to enhance these fracture signals and to suppress the reflections in seismic data. The workflows were first tested on a 2D synthetic data set, and then applied to 3D field data from the San Juan …
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