Index Catalog // ScholarsArchive@OSU

Magnetotelluric Constraints on Lithospheric Properties in the Southeastern United States

Creator:: Murphy, Benjamin S.
Abstract:: By inverting EarthScope long-period magnetotelluric (MT) data from the southeastern United States (SEUS), we obtain electrical conductivity images that provides key insights into the geodynamics of this region. Significantly, we resolve a highly electrically resistive block that extends to mantle depths beneath the modern Piedmont and Coastal Plain physiographic provinces....
Resource Type:: Dissertation
Full Text:: approved: _______________________________________________________ Gary D. Egbert By

An efficient data-subspace two-dimensional magnetotelluric inversion and its application to high resolution profile across the San Andreas Faults at Parkfield, California

Creator:: Siripunvaraporn, Weerachai
Resource Type:: Dissertation
Full Text:: across the San Andreas Faults at Parkfield California. Abstract approved: Gary 1X Egbert This

Isostatic evolution and crustal structures of the Amazon continental margin determined by admittance analyses and inversion of gravity data

Creator:: Braga, Luiz F. S.
Resource Type:: Dissertation
Full Text:: . Thank you, for all. With Gary Egbert, my co-advisor, I learned the importance and beauty of inverse

Egbert et al GRL Correction 2000.pdf

Creator:: Egbert, Gary D., Eisel, Markus, Boyd, O. Sierra, and Morrison, H. Frank
Abstract:: Magnetotelluric (MT) data from two sites 150 and 300 km southeast of San Francisco, California (geomagnetic dipole latitude: 43 degrees, L approximately 1.9) show that the usual MT assumption of spatially uniform external magnetic fields is violated to a significant degree in the period range 10-30 s. Inter-station transfer functions...
Full Text:: in Mid‐Latitude Geomagnetic Transfer Functions” by Gary D. Egbert, Markus Eisel, O

Egbert et al GRL 2000.pdf

Creator:: Egbert, Gary D., Eisel, Markus, Boyd, O. Sierra, and Morrison, H. Frank
Abstract:: Magnetotelluric (MT) data from two sites 150 and 300 km southeast of San Francisco, California (geomagnetic dipole latitude: 43 degrees, L approximately 1.9) show that the usual MT assumption of spatially uniform external magnetic fields is violated to a significant degree in the period range 10-30 s. Inter-station transfer functions...
Full Text:: DC trains and Pc3s: Source effects in mid-latitude geomagnetic transfer functions Gary D. Egbert

Hybrid conjugate gradient-Occam algorithms for inversion of multifrequency and multitransmitter EM data

Creator:: Egbert, Gary D.
Abstract:: We describe novel hybrid algorithms for inversion of electromagnetic geophysical data, combining the computational and storage efficiency of a conjugate gradient approach with an Occam scheme for regularization and step-length control. The basic algorithm is based on the observation that iterative solution of the symmetric (Gauss-Newton) normal equations with conjugate...
Resource Type:: Article
Full Text:: multifrequency and multitransmitter EM data Gary D. Egbert College of Oceanic and Atmospheric Sciences, Oregon

Sampling bias in VGP longitudes

Creator:: Egbert, Gary D.
Abstract:: I derive probability densities for virtual geomagnetic pole( VGP) longitudes for a general statistical model of local magnetic field variations. I show that even for very simple statistically homogeneous models of secular variation, the distribution of VGP longitudes is peaked 90° away from the sampling longitude. Thus, when sites are...
Resource Type:: Article
Full Text:: , VOL. 19, NO. 23, PAGES 2353-2356, DECEMBER 2, 1992 SAMPLING BIAS IN VGP LONGITUDES Gary D. Egbert

A 3-D Tomographic Model of the P-wave Velocity Structure of the Central Cascadia Forearc

Creator:: Kenyon, Christopher Bradford
Abstract:: Signals from the R/V Langseth’s tuned airgun array were recorded on an array of 33 EarthScope FlexArray seismometers deployed in the Oregon Coast Range from 43.5° to 45°N as part of the 2012 Ridge2Trench experiment to image the structure of the Juan de Fuca plate. This segment of the Juan...
Resource Type:: Masters Thesis
Full Text:: thank Gary Egbert, and John Nabelek for serving on my committee, for providing me with valuable

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:: vertical magnetic transfer functions Tietze, K., Ritter, O., & Egbert, G. D. (2015). 3-D joint inversion

Earthquake Relocation in Three-Dimensional Velocity Models for Central Cascadia Continental Margin

Creator:: Ghorbani, Paria
Abstract:: We used data from Cascadia Initiative and Blanco Transform Fault Zone array of ocean bottom seismometers and hydrophone to look at the seismicity and specially depth of the Central Cascadia Continental Margin events. Events were detected and located automatically with Antelope software package (Boulder Real Time Technologies). We looked at...
Resource Type:: Capstone Project
Full Text:: Gary Egbert for accepting to be in my committee and reviewing the manuscript. I need to thank my

ScholarsArchive@OSU

Magnetotelluric Constraints on Lithospheric Properties in the Southeastern United States

An efficient data-subspace two-dimensional magnetotelluric inversion and its application to high resolution profile across the San Andreas Faults at Parkfield, California

Isostatic evolution and crustal structures of the Amazon continental margin determined by admittance analyses and inversion of gravity data

Egbert et al GRL Correction 2000.pdf

Egbert et al GRL 2000.pdf

Hybrid conjugate gradient-Occam algorithms for inversion of multifrequency and multitransmitter EM data

Sampling bias in VGP longitudes

A 3-D Tomographic Model of the P-wave Velocity Structure of the Central Cascadia Forearc

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

Earthquake Relocation in Three-Dimensional Velocity Models for Central Cascadia Continental Margin

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