Results 71 to 80 of about 1,817,388 (196)

Implications of heterogeneous embankment conditions for geoelectrical investigations on dams: A case study at Mactaquac Dam, Canada

Near Surface Geophysics, Volume 24, Issue 4, Page 303-324, August 2026.
Abstract Electrical resistivity tomography (ERT) has been shown to be effective for surveying and monitoring dams, due to the method's sensitivity to moisture content and relevant physical properties (e.g., porosity). Automated ERT systems, capable of time‐lapse monitoring, can be used to detect variations in ground conditions.
John S. Ball, Karl E. Butler, Jonathan E. Chambers, Paul B. Wilkinson, Andrew Binley   +4 more
wiley   +1 more source

Assessment of the Impact of Geomagnetic Disturbances on Korean Electric Power Systems

Energies, 2018
Geomagnetic disturbances have the potential to impact the operation of electric power systems, and thus the assessment of their impacts is required as the first step for secure power system operations.
Byoung-Soo Joo, Jung-Wook Woo, Jeong-Hun Lee, Injoo Jeong, Jungmin Ha, Se-Hee Lee, Soobae Kim   +6 more
doaj   +1 more source

3D effects of seawater on electrical resistivity tomography near shorelines—Challenges and possible solutions inferred from synthetic and field data

Near Surface Geophysics, Volume 24, Issue 4, Page 364-391, August 2026.
Abstract Electrical resistivity tomography (ERT) is one of the most widely used geophysical techniques for hydrogeological questions, such as investigating the groundwater transition zone between land and sea. The interpretation of 2D coast‐parallel ERT profiles is challenging because most of the electrical current flows through the highly conductive ...
Simon Levin Fischer, Ercan Erkul, Jasper Justus Lutz Hoffmann, Şerif Barış, Ertan Pekşen, İsmail Kaplanvural, Wolfgang Rabbel   +6 more
wiley   +1 more source

Kamafugite Magma Pathways and Lava‐Flow Paleotopography From Three‐Dimensional Audiomagnetotelluric Imaging Constrained by Borehole Data

Earth and Space Science, Volume 13, Issue 8, August 2026.
Abstract An audiomagnetotelluric (AMT) survey was conducted within the Alto Paranaíba Igneous Province, southeastern Brazil, to delineate shallow occurrences of kamafugite, a rare ultrapotassic volcanic rock worldwide. A dense grid of AMT stations was deployed, allowing the construction of a high‐resolution 3D electrical resistivity model ...
Lucca M. Franco, Emanuele F. La Terra, Liliane P. Panetto, Adevilson O. Alves, Miguel A. Tupinambá, Sergio L. Fontes, Emin U. Ulugergerli   +6 more
wiley   +1 more source

Mapping a Carrington Storm

Geophysical Research Letters
A map is presented of median 1‐min‐resolution peak geoelectric‐field strength across the United States as would be induced by magnetic storms as intense as the 2 September 1859 Carrington storm.
Jeffrey J. Love, Greg M. Lucas, Anna Kelbert, E. Joshua Rigler, Paul A. Bedrosian, Neesha R. Schnepf   +5 more
doaj   +1 more source

Regression‐based forecast model of induced geoelectric field

Space Weather, 2017
AbstractThe electric field induced due to solar activity is the driver of geomagnetically induced currents (GIC) in grounded conductor networks such as power grids. We present a regression‐based (i.e., empirical) model for quantitatively predicting the upper envelope of induced E field components, using near‐Earth measurements of solar wind plasma and ...
S. I. Lotz, M. J. Heyns, P. J. Cilliers
openaire   +1 more source

Long‐Term Peak Geoelectric Field Behavior for Space Weather Hazard Assessment in Alberta, Canada Using Geomagnetic and Magnetotelluric Measurements

Space Weather
To better understand the risks of space weather to electric power transmission networks, magnetometer data and nearby magnetotelluric impedance data at four sites in Alberta, Canada are used to estimate the induced geoelectric field over the last 12–32 ...
Darcy Cordell, Ian R. Mann, Stavros Dimitrakoudis, Hannah Parry, Martyn J. Unsworth   +4 more
doaj   +1 more source

Estimating geoelectric fields for geoelectric hazard assessment: an examination of data and models within complex physiographic zones

, 2019
Includes bibliographical references.2019 Summer.During magnetic storms, time-varying geomagnetic fields induce geoelectric fields at the surface that produce geomagnetically induced currents (GICs) within power transmission systems.
Cuttler, Stephen W.
core  

Three-dimensional geoelectric model of the Kirovograd ore area of the central part of the Ukrainian Shield

Геофизический журнал, 2013
The authors give their 3D geoelectric model of the Kirovohrad ore district and consider aspects related to the association of uranium manifestations of albitite formation, gold fields and manifestations of graphite with anomalies of increased electrical
I. Nikolaev, T.K. Burakhovich, E. Sheremet   +2 more
doaj   +1 more source

Geo-Electric Resistivity Method of Dipole-Dipole Configuration For Cavities Model 2D in Karst Area of Temurejo Village Gubug Sub-district Central Java District

Journal of Physics: Theories and Applications, 2017
The purpose of this research is to mapping cavities in karst area in Temurejo Village, Karangrayung, Grobogan using geoelectric resistivity method and dipole-dipole configuration.
Yuanna Rhesdeantia, Teguh Darsono, Khumaedi Khumaedi   +2 more
doaj   +1 more source