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Showing 1 to 16 of 16 for “"reflection seismology"”.
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Reflection seismology for nondestructive evaluation
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2002.
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Adaptive approaches to signal enhancement and deconvolution (with particular reference to reflection seismology)
… and signal enhancement,<br/>particularly in reflection seismology. Adaptive processes are divided<br/>into two classes - modelled and empirical. The power of both these<br/>approaches is demonstrated by concentrating primarily on one algorithm of<br/>each class. In the case of the modelled …
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Mapping of impediments to contaminant flow using multicomponent reflection seismology at the Savannah River site
Includes bibliographical references (pages 121-123).
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Approximate inverse scattering using pseudodifferential scaling
… arising in the linearized inverse problem for reflection seismology. The inversion of the normal operator using direct matrix methods is computationally infeasible. Approximate inverses estimate the solution of the inverse problem or precondition iterative methods. Application of the normal …
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Ps receiver function imaging of crustal structure and Moho topography beneath the Northeast Caribbean.
… a technique analogous to "velocity analysis" in reflection seismology. We image a strong positive amplitude feature that shallows from ~40 km in the west to ~30 km in the east, which we interpret as the Moho. We also image a feature at ~80 km, which we conclude to be a subducting North America …
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A Comparative Case Study of Reflection Seismic Imaging Method
Reflection seismology is the most comand effective method to gather information on the earth interior. The quality of seismic images is highly variable depending on the complexity of the underground and on how seismic data are acquired and processed. One of the crucial steps in this process, …
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Microlocal regularity of an inverse problem for the multidimensional wave equation
Many physical processes such as reflection seismology, oil exploration, and ground-penetrating radar may be modeled as inverse problems for the multidimensional acoustic wave equation with point energy sources. The inverse problem is to identify the coefficients from the knowledge of boundary …
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Analyses and Applications of Seismic Surface Waves Using Machine Learning Algorithm
… However, they are noise components in reflection seismology in hydrocarbon exploration. Detecting and outlining the region of surface waves in seismic gathers facilitates either their inversion for sub-surface structures or their noise removal. I propose an unsupervised machine-learning …
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Velocity and Q from reflection seismic data
… encountered in the acquisition 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 = …
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Anisotropic media and the determination of subsurface velocity by the use of surface seismic reflection data
… anisotropic media by the use of surface seismic reflection data are analyzed. Previous studies of anisotropy in exploration seismology required bore-hole data as well as surface data to detect the presence of velocity anisotropy. Three special types of wave propagation are of interest in …
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An Integrated Geophysical Study of the Central Appalachians of Western Virginia and Eastern West Virginia
Over 700 km of industry seismic reflection data in the central Appalachians were reprocessed using both conventional and newly developed processing schemes. A new processing sequence, called dip projection, is introduced. The technique projects crooked-line processed CMPs onto a straight line …
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Body and surface wave ambient noise seismic interferometry across the Salton Sea Geothermal Field, California
… gathers. Creation of a low-quality multichannel reflection stack revealed two weak reflectors in the upper 2 km.
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Crustal Structure in a Mesozoic Extensional Terrane: The South Georgia Rift and the Epicentral Area of the 1886 Charleston, South Carolina, Earthquake
… of the event. Recently evidence from seismic reflection profiles have shed light on the tectonic environment of the area. The epicentral area of the 1886 event lies within the South Georgia Rift, a Mesozoic rift terrane. Previous studies have revealed clues to the geologic structure and …
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Geology of ultra-high-pressure rocks from the Dabie Shan, Eastern China
Um das Verständnis der geologischen Entwicklung des größten bekannten Vorkommens von ultra-hochdruck (UHP) Gesteinen auf der Erde, des Dabie Shan im östlichen China, zu erhöhen, wurde eine multidisziplinäre Studie durchgeführt. Geophysikalische Daten wurden entlang einer ca. 20 km langen …
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Seismic Site Characterization for the Deep Science and Engineering Laboratory (DUSEL) at Kimballton, Virginia
… 3 km in length, are standard multifold seismic reflection data aimed at imaging faults, thrust sheets, and repeated sections of Paleozoic rocks in the vicinity of the proposed Kimballton site. Crooked line geometry, irregular geophone spacing, ground roll, and poor impedance contrasts between …
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Tectonics of the East Pacific rise : studies of faulting characteristics and magnetic and gravity anomalies
… the top of the axial magma chamber indicated by reflection seismology. For a magnetic source layer that is 500 or 750 m thick, the observed along-axis variations in FeO and Ti02 explain only 36 and 60%, respectively, of the total variance of axial magnetization anomalies. Therefore, a combination …