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.
Results
Showing 1 to 20 of 109 for “"ambient noise"”.
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Arctic Ocean ambient noise.
Thesis (Ocean E)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1979.
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Underwater acoustic ambient noise in the Arctic
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1982.
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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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Ambient noise and surface wave dissipation in the ocean
… by breaking waves is responsible for much of the ambient noise level in the ocean. While numerous field measurements have shown a strong correlation between the ambient noise spectrum level (N) in the range 100Hz to 25kHz and wind speed in the ocean, very little has been done to establish a …
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Ambient noise and surface wave dissipation in the ocean
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1993.
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The estimation of Arctic ice thickness from ambient noise
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1995.
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Long-Term Ambient Noise Statistics in the Gulf of Mexico
Long-term omni-directional ambient noise was collected at several sites in the Gulf of Mexico during 2004 and 2005. The Naval Oceanographic Office deployed bottom moored Environmental Acoustic Recording System (EARS) buoys approximately 159 nautical miles south of Panama City, Florida, in water …
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Ambient noise interferometry and surface-wave array tomography in southeastern Tibet
… Green's functions (EGFs) recovered from ambient noise interferometry and from traditional teleseismic surface-wave two-station (TS) analysis. The non-stationarity (e.g., seasonal changes) and non-uniform distribution of ambient noise sources may obstruct full reconstruction of the …
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1D shallow sedimentary subsurface imaging using ambient noise and active seismic data
The Earth’s shallow subsurface with sedimentary cover acts as a waveguide to any incoming wavefield. Within the framework of my thesis, I focused on the characterization of this shallow subsurface within tens to few hundreds of meters of sediment cover. I imaged the seismic 1D shear wave velocity …
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A statistical analysis of ambient noise monitored in the Arctic Ocean Basin
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1983.
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A study of the seismic behaviour of geomorphological features using ambient noise measurements
… by the Upper Globigerina Limestone. Ambient noise was measured using Micromed Tromino® portable seismograph. The HVSR method (Horizontal-to-Vertical Spectral Ratio) was used to investigate ground amplification, while the covariance matrix method was used to estimate the polarization …
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Ambient noise tomography for wavespeed and anisotropy in the crust of southwestern China
… for Rayleigh and Love waves are extracted from ambient noise interferometry. Using the Green's functions, we first conduct traditional traveltime tomography for the two shear wavespeeds Vsv and Vsh Their differences are measured as radial anisotropy. We then conduct Eikonal tomography to study …
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Seismo-acoustic rough interface scattering of surface-generated ambient noise in a stratified ocean
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1993.
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Oceanic ambient noise in the Arctic on the Chukchi Shelf: broadband characteristics and environmental drivers
This thesis encompasses an analysis of underwater ambient noise collected by the yearlong Canada Basin Acoustic Propagation Experiment (CANAPE) on the Chukchi Shelf of the Arctic. This location contained the Beaufort Duct, a significant effect of climate change on the Arctic’s underwater …
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Ambient noise measurements in the 200-300 Hz band during the Greenland Sea tomography experiment
… in 1988, and a year long time series of ambient noise in the 200-300 Hz was collected by those moorings. Large scale meteorological environmental information, particularly wind, was provided during that same year by the British Meteorological Office. Time series of ice type and ice …
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Oceanic Ambient Noise in the Arctic on the Chukchi Shelf: Broadband Characteristics and Environmental Drivers
This thesis encompasses an analysis of underwater ambient noise collected by the yearlong Canada Basin Acoustic Propagation Experiment (CANAPE) on the Chukchi Shelf of the Arctic. This location contained the Beaufort Duct, a significant effect of climate change on the Arctic’s underwater …
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Body and surface wave ambient noise seismic interferometry across the Salton Sea Geothermal Field, California
… of seismic interferometry from 135 hours of ambient noise recorded during a controlled-source survey across the Salton Sea Geothermal Field in southern California. The non-uniform nature of the noise sources violated a primary assumption of the method and generated artifacts in the data. The …
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