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 23 for “"seismic noise"”.
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Sources of seismic noise in boreholes
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1982.
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A wavelet model of seismic noise
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1955.
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Velocity and anisotropy structure of the Icelandic crust - An ambient seismic noise analysis
Measuring the travel times of seismic waves is one of the most important tools for uncovering Earth’s structure and dynamics. In recent years, the discovery that surface wave dispersion could be estimated from ambient noise has introduced new possibilities into the field of seismic imaging, such as …
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Ambient seismic noise imaging using trans-dimensional and machine learning techniques with application to Borneo and Iceland
… wave dispersion measurements from 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 …
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Ambient seismic noise tomography of the southern United States and seismic inversion with dictionary learning using unsupervised machine learning.
Seismic tomography and inversion are well-established methods to understand deep subsurface structures. These techniques are particularly effective in delineating complex crustal architectures, which often deviate from simplified textbook models. High-resolution seismic tomography enables the …
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Imaging the crust and uppermost mantle of north central Alaska using the joint inversion of ambient seismic noise correlation and receiver function
Seismic velocity models obtained from the joint inversion of ambient seismic noise correlation and receiver function analysis show a representation of the crustal and uppermost mantle velocity structure in north central Alaska. Due to the lack of station coverage and inhospitable terrain, the …
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Improved seismic isolation for the Laser Interferometer Gravitational Wave Observatory with hydraulic external pre-isolator system
… which in most cases is predominated by seismic noise. We examined the recent seismic noise records at LLO and LHO, and found the seismic noise at both sites had decreased from Oct. 1, 2003 to Oct. 1, 2006. No long term trend can be derived from the there-year data studied, however it is …
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Characterization of an advanced LIGO quadruple pendulum system
… At low frequencies, typically below 30 Hz, seismic noise is the dominant noise source that limits the sensitivity with which GW-induced mirror displacements can be measured. To shield the mirrors from the seismically driven motion of the ground, they are suspended from pendula which are in …
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Development of techniques for earthquake microzonation studies in different urban environment
… planning. In particular, within the context of seismic hazard assessment, the evaluation of local site effects and their influence on the spatial distribution of ground shaking generated by an earthquake plays an important role. It follows that the carrying out of earthquake microzonation …
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Time-Lapse Depletion Modeling Sensitivity Study: Gas-Filled Gulf of Mexico Reservoir
Time-lapse seismic allows oil/gas reservoir monitoring during production, highlighting compaction and water movement. Time-lapse modeling, using a stress-dependent rock physics model, helps determine the need and frequency of expensive repeat seismic acquisition. We simulate a Gulf of Mexico gas …
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URBAN SEISMIC AMBIENT NOISE ANALYSIS: INNOVATIONS AND APPLICATIONS
Seismic ambient noise generated by human activities provides an opportunity to monitor aboveground human activities without intruding on privacy. However, extracting specific signals from noisy seismic noise is challenging. Seismic ambient noise also contains information about the underground …
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Towards monitoring volcanoes in Iceland and Hawai’i with seismic velocity variations
Seismic noise interferometry is an exciting technique for studying volcanoes because it provides a continuous measurement of relative seismic velocity (dv/v), which is sensitive to magmatic processes that affect the physical properties of the surrounding crust. However, understanding the causal …
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Earthquake-induced landsliding
… to landscape and mountain formation. However, seismic waves produced by earthquakes may also destabilize hillslopes, leading to large amounts of soil and bedrock moving downslope. Moreover, static deformation and shaking are suspected to damage the surface bedrock and therefore alter its future …
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Seismic hazard assessment in Central Asia
Central Asia is one of the world’s most seismically active regions, with the highest level of seismic hazard. Usually seismic hazard is estimated considering ground motion at rock site, but since the ground motion could vary significantly over short distances due to local surficial geology, it is …
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A Thermal Enclosure Prototype For A Suspended Inertial Sensor
… low frequency band, one of the main sources of noise is seismic vibration. Lowering the noise level in this band, helps us to follow the coalescence of compact binary systems earlier in their transformation and increase the signal-to-noise ratio. It also allows us to detect merger of more …
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Wind Induced Ground Motion
Wind noise is a problem in seismic surveys and can mask the seismic signals at low frequency. Development of practical solutions to this problem must be based on a good understanding of the mechanism of the wind-ground coupling. This thesis investigates the driving pressure and shear stress …
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Seismic Investigation on Temporal Structural Changes and Joint Inversion of Sedimentary and Crustal Structure Beneath North China
In recent years, time-lapse seismic imaging (4D) has received wide attentions as accurate imaging of the evolving subsurface structure has significant applications in disaster reduction, resource exploration, and environmental monitoring. One particularly interesting area to seismologists is …
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The structure and seismicity of Icelandic rifts
… in central Iceland, and used the passive seismic data collected from this network to explore crustal structure and volcanic processes in the extensional rift zones. My analysis of persistent seismicity located in an intervening region between individual spreading segments, uniquely records …
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Approaches to earthquake scenarios validation using seismic site response
A seismic hazard assessment was carried out for the Catania and Siracusa towns providing a comprehensive re-examination and re-processing of all the available seismic data. The site approach and the seismotectonic one were used and compared. The hazard assessment, using both methods, was performed …
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