Benjamin S Murphy, PhD (Former Employee)
Science and Products
North American electricity power-grid and communication-network anomalies for several magnetic storms North American electricity power-grid and communication-network anomalies for several magnetic storms
Anomaly lists are presented documenting operational interference to electricity power grids and communication networks in the United States and Canada during magnetic storms. Four of the anomaly lists apply for magnetic storms that occurred in March 1989, August 1972, March 1940, and for various storms 1946-2000; yet another list consists of statistical values summarizing geomagnetically...
Geoelectric evidence for a wide spatial footprint of active extension in central Colorado Geoelectric evidence for a wide spatial footprint of active extension in central Colorado
Three-dimensional magnetotelluric (MT) imaging in central Colorado reveals a set of north-striking high-conductivity tracks at lower-crustal (50–20 km) depths, with conductive finger-like structures rising off these tracks into the middle crust (20–5 km depth). We interpret these features to represent saline aqueous fluids and partial melt that are products of active extensional...
Authors
Benjamin S. Murphy, Jonathan Saul Caine, Paul A. Bedrosian, Kayla J Crosbie
Modeling geomagnetic induction in submarine cables Modeling geomagnetic induction in submarine cables
Submarine cables have become a vital component of modern infrastructure, but past submarine cable natural hazard studies have mostly focused on potential cable damage from landslides and tsunamis. A handful of studies examine the possibility of space weather effects in submarine cables. The main purpose of this study is to develop a computational model, using Python, of geomagnetic...
Authors
Shibaji Chakraborty, David H. Boteler, Xueling Shi, Benjamin Scott Murphy, Michael D. Hartinger, Xuan Wang, Greg M. Lucas, Joseph B. H. Baker
Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia
Using images from an updated and expanded three-dimensional electrical conductivity synthesis model for the contiguous United States (CONUS), we highlight the key continent-scale geoelectric structures that are associated with the Precambrian assembly of southern Laurentia. Conductivity anomalies are associated with the Trans-Hudson orogen, the Penokean suture, the ca. 1.8–1.7 Ga...
Authors
Benjamin Scott Murphy, Paul A. Bedrosian, Anna Kelbert
Graphite as an electrically conductive indicator of ancient crustal-scale fluid flow within mineral systems Graphite as an electrically conductive indicator of ancient crustal-scale fluid flow within mineral systems
Magnetotelluric (MT) imaging results from mineral provinces in Australia and in the United States show an apparent spatial relationship between crustal-scale electrical conductivity anomalies and major magmatic-hydrothermal iron oxide-apatite/iron oxide-copper-gold (IOA-IOCG) deposits. Although these observations have driven substantial interest in the use of MT data to image ancient...
Authors
Benjamin Scott Murphy, Jan Marten Huizenga, Paul A. Bedrosian
Mapping a magnetic superstorm: March 1989 geoelectric hazards and impacts on United States power systems Mapping a magnetic superstorm: March 1989 geoelectric hazards and impacts on United States power systems
A study is made of the relationships between geomagnetic and geoelectric field variation, Earth-surface impedance, and operational interference (anomalies) experienced on electric-power systems across the contiguous United States during the March 13-14, 1989 magnetic storm. For this, a 1-minute-resolution sequence of geomagnetic field maps is constructed from magnetometer time series...
Authors
Jeffrey J. Love, Greg M. Lucas, E. Joshua Rigler, Benjamin Scott Murphy, Anna Kelbert, Paul A. Bedrosian
Characteristics and sources of intense geoelectric fields in the United States: Comparative analysis of multiple geomagnetic storms Characteristics and sources of intense geoelectric fields in the United States: Comparative analysis of multiple geomagnetic storms
Intense geoelectric fields during geomagnetic storms drive geomagnetically induced currents in power grids and other infrastructure, yet there are limited direct measurements of these storm-time geoelectric fields. Moreover, most previous studies examining storm-time geoelectric fields focused on single events or small geographic regions, making it difficult to determine the typical...
Authors
Xueling Shi, Michael D Hartinger, Joseph B. H. Baker, Benjamin Scott Murphy, Paul A. Bedrosian, Anna Kelbert, Erin (Josh) Rigler
Science and Products
North American electricity power-grid and communication-network anomalies for several magnetic storms North American electricity power-grid and communication-network anomalies for several magnetic storms
Anomaly lists are presented documenting operational interference to electricity power grids and communication networks in the United States and Canada during magnetic storms. Four of the anomaly lists apply for magnetic storms that occurred in March 1989, August 1972, March 1940, and for various storms 1946-2000; yet another list consists of statistical values summarizing geomagnetically...
Geoelectric evidence for a wide spatial footprint of active extension in central Colorado Geoelectric evidence for a wide spatial footprint of active extension in central Colorado
Three-dimensional magnetotelluric (MT) imaging in central Colorado reveals a set of north-striking high-conductivity tracks at lower-crustal (50–20 km) depths, with conductive finger-like structures rising off these tracks into the middle crust (20–5 km depth). We interpret these features to represent saline aqueous fluids and partial melt that are products of active extensional...
Authors
Benjamin S. Murphy, Jonathan Saul Caine, Paul A. Bedrosian, Kayla J Crosbie
Modeling geomagnetic induction in submarine cables Modeling geomagnetic induction in submarine cables
Submarine cables have become a vital component of modern infrastructure, but past submarine cable natural hazard studies have mostly focused on potential cable damage from landslides and tsunamis. A handful of studies examine the possibility of space weather effects in submarine cables. The main purpose of this study is to develop a computational model, using Python, of geomagnetic...
Authors
Shibaji Chakraborty, David H. Boteler, Xueling Shi, Benjamin Scott Murphy, Michael D. Hartinger, Xuan Wang, Greg M. Lucas, Joseph B. H. Baker
Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia
Using images from an updated and expanded three-dimensional electrical conductivity synthesis model for the contiguous United States (CONUS), we highlight the key continent-scale geoelectric structures that are associated with the Precambrian assembly of southern Laurentia. Conductivity anomalies are associated with the Trans-Hudson orogen, the Penokean suture, the ca. 1.8–1.7 Ga...
Authors
Benjamin Scott Murphy, Paul A. Bedrosian, Anna Kelbert
Graphite as an electrically conductive indicator of ancient crustal-scale fluid flow within mineral systems Graphite as an electrically conductive indicator of ancient crustal-scale fluid flow within mineral systems
Magnetotelluric (MT) imaging results from mineral provinces in Australia and in the United States show an apparent spatial relationship between crustal-scale electrical conductivity anomalies and major magmatic-hydrothermal iron oxide-apatite/iron oxide-copper-gold (IOA-IOCG) deposits. Although these observations have driven substantial interest in the use of MT data to image ancient...
Authors
Benjamin Scott Murphy, Jan Marten Huizenga, Paul A. Bedrosian
Mapping a magnetic superstorm: March 1989 geoelectric hazards and impacts on United States power systems Mapping a magnetic superstorm: March 1989 geoelectric hazards and impacts on United States power systems
A study is made of the relationships between geomagnetic and geoelectric field variation, Earth-surface impedance, and operational interference (anomalies) experienced on electric-power systems across the contiguous United States during the March 13-14, 1989 magnetic storm. For this, a 1-minute-resolution sequence of geomagnetic field maps is constructed from magnetometer time series...
Authors
Jeffrey J. Love, Greg M. Lucas, E. Joshua Rigler, Benjamin Scott Murphy, Anna Kelbert, Paul A. Bedrosian
Characteristics and sources of intense geoelectric fields in the United States: Comparative analysis of multiple geomagnetic storms Characteristics and sources of intense geoelectric fields in the United States: Comparative analysis of multiple geomagnetic storms
Intense geoelectric fields during geomagnetic storms drive geomagnetically induced currents in power grids and other infrastructure, yet there are limited direct measurements of these storm-time geoelectric fields. Moreover, most previous studies examining storm-time geoelectric fields focused on single events or small geographic regions, making it difficult to determine the typical...
Authors
Xueling Shi, Michael D Hartinger, Joseph B. H. Baker, Benjamin Scott Murphy, Paul A. Bedrosian, Anna Kelbert, Erin (Josh) Rigler