Index Catalog // ScholarsArchive@OSU

Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data

Creator:: Sun, J., Kelbert, A., and Egbert, G. D.
Abstract:: Long-period global-scale electromagnetic induction studies of deep Earth conductivity are based almost exclusively on magnetovariational methods and require accurate models of external source spatial structure. We describe approaches to inverting for both the external sources and three-dimensional (3-D) conductivity variations and apply these methods to long-period (T≥1.2 days) geomagnetic observatory...
Resource Type:: Article
Full Text:: global geomagnetic induction using ground geomagnetic observatory data Sun, J., Kelbert, A., & Egbert

Deep electrical resistivity structure of the Northwestern U. S. derived from 3-D inversion of USArray Magnetotelluric data

Creator:: Meqbel, Naser M., Egbert, Gary D., Wannamaker, Philip E., Kelbert, Anna, and Schultz, Adam
Abstract:: Long period (10–20,000 s) magnetotelluric (MT) data are being acquired across the continental USA on a quasi-regular grid of ∼70 km spacing as an electromagnetic component of the National Science Foundation EarthScope/USArray Program. These data are sensitive to fluids, melts, and other organic indicators, and thus provide a valuable complement...
Resource Type:: Article
Full Text:: . M., Egbert, G. D., Wannamaker, P. E., Kelbert, A., & Schultz, A. (2014). Deep electrical

Global 3-D electromagnetic forward modelling: a benchmark study

Creator:: Kelbert, Anna, Kuvshinov, Alexey, Velímský, Jakub, Koyama, Takao, Ribaudo, Joseph, Sun, Jin, Martinec, Zdeněk, and Weiss, Chester J.
Abstract:: Global electromagnetic (EM) induction studies have been the focus of increasing attention during the past few years. A primary stimulus for this interest has been increased quality, coverage and variety of the newly available data sets especially from recent low-Earth-orbiting satellite missions. The combination of traditional ground-based data with satellite-borne...
Resource Type:: Article
Full Text:: modelling: a benchmark study Kelbert, A., Kuvshinov, A., Velímský, J., Koyama, T., Ribaudo, J., Sun, J

The Impact of Disturbance on Carbon Stores and Dynamics in Forests of Coastal Alaska

Creator:: Yatskov, Mikhail A.
Abstract:: Changes in climate caused by increased concentrations of carbon dioxide (CO₂) in the Earth’s atmosphere have led land and ocean surface temperatures to increase by 0.85°C and sea level to increase by 19 cm relative to preindustrial times. Global climate change will lead to further alterations in mean temperature and...
Resource Type:: Dissertation
Full Text:: ABSTRACT OF THE THESIS OF Mikhail A. Yatskov for the degree of Doctor of Philosophy in Forest

A Generation Prioritization Method for Power System Restoration with Renewable Resources

Creator:: Mate, Adam
Abstract:: The electrical grid is a key component of the Nation's critical infrastructure. Its continuous and reliable operation is of vital importance; any system-wide disruption would have a debilitating impact on crucial services, public health and safety, the economy, and the national security of the United States. High-impact low-frequency events pose...
Resource Type:: Dissertation
Full Text:: A Generation Prioritization Method for Power System

A seasonally modulated earthquake swarm near Maupin, Oregon

Creator:: Braunmiller, Jochen, Nábělek, John L., and Tréhu, Anne M.
Abstract:: From December 2006 to November 2011, the Pacific Northwest Seismic Network (PNSN) reported 467 earthquakes in a swarm 60 km east of Mt Hood near the town of Maupin, Oregon. The swarm included 20 M[subscript D] ≥ 3.0 events, which account for over 80 per cent of the cumulative seismic...
Resource Type:: Article
Full Text:: . Meqbel, N.M., Egbert, G.D., Wannamaker, P.E., Kelbert, A. & Schultz, A., 2014.Deep electrical resistivity

Crustal inheritance and a top-down control on arc magmatism at Mount St. Helens

Creator:: Bedrosian, Paul A., Peacock, Jared R., Bowles-Martinez, Esteban, Schultz, Adam, and Hill, Graham
Abstract:: In a subduction zone, the volcanic arc marks the location where magma, generated via flux melting in the mantle wedge, migrates through the crust and erupts. While the location of deep magma broadly defines the arc position, here we argue that crustal structures, identified in geophysical data from the Washington...
Resource Type:: Article
Full Text:: 416 36Egbert, G.D. & Kelbert, A. Computational recipes for electromagnetic inverse problems. 417

A magnetotelluric investiagation of shallow conductivity sources beneath the Cascadia Volcanic Arc

Creator:: Bonner, L. Roy, IV
Abstract:: The Cascade Volcanic Arc has been the subject of extensive study in the past due to its active volcanism and its proximity to metropolitan areas. The triangle formed by the volcanoes Mount Saint Helens, Mount Rainier, and Mount Adams is of particular interest because of this potential danger and the...
Resource Type:: Honors College Thesis
Full Text:: A magnetotelluric investigation of shallow conductivity

3-D joint inversion of the magnetotelluric phase tensor and vertical magnetic transfer functions

Creator:: Tietze, Kristina, Ritter, Oliver, and Egbert, Gary D.
Abstract:: With advancing computational resources, 3-D inversion techniques have become feasible in recent years and are now a more widely used tool for magnetotelluric (MT) data interpretation. Galvanic distortion caused by small-scale near-surface inhomogeneities remains an obstacle for 3-D MT inversion which so far has experienced little attention. If not considered...
Resource Type:: Article
Full Text:: package (Egbert & Kelbert 2012; Kelbert et al. 2014) is based on a standard minimum- structure non-linear

Rapid prediction of electric fields associated with geomagnetically induced currents in the presence of three-dimensional ground structure: Projection of remote magnetic observatory data through magnetotelluric impedance tensors

Creator:: Bonner, L. R. and Schultz, Adam
Abstract:: Ground level electric fields arising from geomagnetic disturbances (GMDs) are used by the electric power industry to calculate geomagnetically induced currents (GICs) in the power grid. Current industry practice is limited to electric fields associated with 1‐D ground electrical conductivity structure, yet at any given depth in the crust and...
Resource Type:: Article
Full Text:: 1-D models. Solving Maxwell’s equations for electric fields associated with GMDs above a 3-D Earth

ScholarsArchive@OSU

Ionospheric current source modeling and global geomagnetic induction using ground geomagnetic observatory data

Deep electrical resistivity structure of the Northwestern U. S. derived from 3-D inversion of USArray Magnetotelluric data

Global 3-D electromagnetic forward modelling: a benchmark study

The Impact of Disturbance on Carbon Stores and Dynamics in Forests of Coastal Alaska

A Generation Prioritization Method for Power System Restoration with Renewable Resources

A seasonally modulated earthquake swarm near Maupin, Oregon

Crustal inheritance and a top-down control on arc magmatism at Mount St. Helens

A magnetotelluric investiagation of shallow conductivity sources beneath the Cascadia Volcanic Arc

3-D joint inversion of the magnetotelluric phase tensor and vertical magnetic transfer functions

Rapid prediction of electric fields associated with geomagnetically induced currents in the presence of three-dimensional ground structure: Projection of remote magnetic observatory data through magnetotelluric impedance tensors

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