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Full-Text Articles in Physical Sciences and Mathematics
A Comparison Of Predicted And Observed Ocean Tidal Loading Displacements Around The Puget Sound, Tanessa Caitlyn Morris
A Comparison Of Predicted And Observed Ocean Tidal Loading Displacements Around The Puget Sound, Tanessa Caitlyn Morris
Undergraduate Theses, Professional Papers, and Capstone Artifacts
Around coastlines and in shallow oceans, models of ocean tidal loading (OTL) are not highly accurate and can create sources of error in OTL analysis. OTL is tides moving ocean water that cause the surface of Earth to deform. In this study, forward-modelled predictions of OTL are compared to observations from Global Navigation Satellite System (GNSS) data to explore the elastic deformation response of Earth to OTL around the Puget Sound. Data from 75 stations were processed to yield position estimates at intervals of 5 minutes for a year. The OTL model used for comparison was the FES2014b ocean-tide model …
Analyzing The Multipath Of Gps Time Series To Study Snow Properties, Ashlesha Khatiwada
Analyzing The Multipath Of Gps Time Series To Study Snow Properties, Ashlesha Khatiwada
Undergraduate Theses, Professional Papers, and Capstone Artifacts
Thousands of Global Positioning System (GNSS) receivers worldwide record signals sent by satellites to infer how each receiver (and the ground they are attached to) moves over time. The motion of GNSS receivers is used for many purposes, including studying tectonic deformation and changes in Earth's shape caused by surface loading. In this project, reflected wave arrivals contained within the multipath signal of GNSS time series are extracted and analyzed to advance understanding of snow properties in mountainous regions of Montana/Idaho, USA. Analyzing reflected signals in GNSS series has the potential to reveal properties of local snowpack, such as height, …
Exploring Effects Of Gps Processing On Atmospheric And Hydrologic Pressure-Induced Crustal Responses, Cody T. Norberg
Exploring Effects Of Gps Processing On Atmospheric And Hydrologic Pressure-Induced Crustal Responses, Cody T. Norberg
Undergraduate Theses, Professional Papers, and Capstone Artifacts
The Earth’s crust is in continuous motion from changes in fluid pressures associated with the redistribution of mass at the surface. These forces, known as surface mass loading, make up a significant amount of signal within GPS time series. This thesis is broken up into two projects exploring atmospheric and hydrologic pressure-induced crustal responses. The first project focuses on effects of GPS processing on corrections of atmospheric loading. We use data from over 1100 GPS stations within the Western US to investigate crustal displacements from atmospheric surface pressure variations. We find that modeling and removing atmospheric mass loading reduces root …
Probing Earth Deformation In Response To Localized Hydrologic Mass Loading, Susitna River Basin, Alaska, Andrew Parker Keene
Probing Earth Deformation In Response To Localized Hydrologic Mass Loading, Susitna River Basin, Alaska, Andrew Parker Keene
Graduate Student Theses, Dissertations, & Professional Papers
Surface mass loading contributes a ubiquitous signal to GPS time series that can be modeled and removed for individual sources. We utilize nine GPS stations in the Susitna River watershed, Alaska, to investigate surface displacements from surface mass loading. We find that modeling atmospheric surface pressure and regional hydrologic mass reduces root mean square (RMS) error by 27-39% for all GPS time series. We observe moderate correlation between residual time series pairs and distance, with elevation differences influencing the strength of this correlation. Seasonal horizontal and vertical displacements are observed after removal of all loading models; stations displace downward and …