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 17 of 17 for “"Earth structure"”.
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New techniques for seismological studies of earth structure
… Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1990.
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Advanced analysis of complex seismic waveforms to characterize the subsurface Earth structure
… major parts, (1) Body wave analysis of mantle structure under the Calabria slab, (2) Spatial Average Coherency (SPAC) analysis of microtremor to characterize the subsurface structure in urban areas, and (3) Surface wave dispersion inversion for shear wave velocity structure. Although these …
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Earth structure and earthquake locations in the Coyote Lake area, central California
… Institute of Technology, Dept. of Earth and Planetary Sciences, 1981.
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APPROXIMATE VS. PURELY NUMERICAL APPROACHES FOR FULL WAVEFORM MODELLING OF GLOBAL EARTH STRUCTURE
… of body and surface waveforms in realistic 3-D Earth models using approximate and purely numerical methods. Firstly, we investigate two techniques: (i) the Born approximation, which should be valid for media with weak heterogeneity; and, (ii) the full ray theory approach, which should be valid …
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Global investigation of large earthquakes using InSAR and long-period seismic data
… in the modelling. Large discrepancies for five earthquakes with magnitudes Mw 6.0 -Mw 8.1 are investigated in detail by comparing seismic data with theoretical seismograms calculated using two forward modelling techniques and 1-D and 3-D Earth models. For moderate magnitude events the InSAR …
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Teleseismic transmission and reflection tomography
… of seismic tomography is to determine a model of Earth properties that best explain observed seismic data. In practice, the limitations placed on our observations and computational capabilities force us to make a number of decisions about the scales and parameterizations of models, the nature of …
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Using sea-level and land motion data to develop an improved glacial isostatic adjustment model for the British Isles
… such as regional ice sheet history, viscoelastic earth structure and the global meltwater (eustatic) signal. Many past studies have used as their primary observable the high quality relative sea level (RSL) data from this region. However, as indicated in these studies, the data are notoriously …
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Velocity analysis in the presence of uncertainty
… analysis resolves relatively long scales of earth structure, on the order of 1 km. Migration produces images with length scales (wavelengths) on the order of 10's of m. In between these two scale regimes lies another, corresponding roughly to structures between 60 to 300m in extent, in which …
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Seismic investigations of the northern Transantarctic Mountains
… the largest non-compressional mountain chain on Earth. The TAMs show no evidence of folding or reverse faulting as is typically seen in contractional mountain building, calling the origin of the mountain range into question. Using data from the recent Transantarctic Mountains Northern Network …
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Enhanced imaging of deep lithospheric and shallow near surface structures through innovations in seismic interferometry and array processing.
… passive seismic imaging methods to investigate Earth structure across a range of scales, from the shallow near-surface to the deep upper mantle. The first study uses array analysis of ambient noise autocorrelograms recorded by a dense nodal array near Sweetwater, Texas to image P-wave …
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Ambient seismic noise imaging using trans-dimensional and machine learning techniques with application to Borneo and Iceland
… ambient seismic noise data for the purposes of Earth imaging has become increasingly common in recent years and has led to many discoveries that have changed or re-enforced our understanding of Earth structure and processes. At the same time, computational advances have led to the use of …
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Developing sustainable and environmentally friendly building materials in rammed earth construction
Building rammed earth structures provides a sustainable alternative to concrete. As a building material, rammed earth exhibits very varied physical and material properties depending on the proportion of constituting soil types. When very sandy soil is used in rammed earth production, the properties …
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Shallow and deep deformation in northern Apennines region using seismological data
… studied using always information recovered from earthquakes, although using different techniques. In particular the shallower deformation has been studied using seismic moment tensors information. For our purpose we used the methods described in Arvidsson and Ekstrom (1998) that allowing the use …
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Receiver function imaging of deep and shallow subsurface structures of Oklahoma
… of humanity about the geological history of the Earth and its prospective evolution. While active seismic imaging is dominantly applied in the exploration industry, passive seismic imaging methods which extract the subsurface information from natural sources (e.g., earthquakes, ambient noise, …
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Seismic structure beneath Southeast Asia from adjoint waveform tomography
… a crucial role in the illumination of deep Earth structure. Most existing tomographic methods are based on seismic ray theory and hence do not fully account for the true physics of wave propagation. Recent computational advances allow us to embrace the full complexity of seismic wave …
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The evolution of the Greenland Ice Sheet from the Last Glacial Maximum to present-day: An assessment using glaciological and Glacial Isostatic Adjustment modelling
… around the margin, lateral variations in Earth structure and/or the pattern of ice margin retreat. Predictions of present-day vertical land motion generated using the new Huy2 model are highly sensitive to variations of upper mantle viscosity. Depending on the Earth model adopted, …
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QUASI STATIC GRAVITY SIGNATURES IN SLOW TECTONIC ZONES: ASSIMILATION OF NOVEL AEROSPACE DATA AND GEOPHYSICAL MODELING
… rate tectonic deformation in areas where the earthquakes enucleate. 2D thermo-mechanical numerical models are used to simulate the crust-mantle dynamics; in particular, complexities such as compositional stratification of crust-lithosphere system, mantle hydration, phase changes and degree of …