Benjamin S. Murphy
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View article: The magnetotelluric array project and a high-resolution electrical conductivity model compilation for the contiguous United States
The magnetotelluric array project and a high-resolution electrical conductivity model compilation for the contiguous United States Open
In its 18-year lifetime, the United States Magnetotelluric Array (USMTArray) has acquired more than 1,700 long-period magnetotelluric (MT) stations covering the entirety of the contiguous United States. Funding from multiple federal agenci…
View article: 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 Open
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 …
View article: Supplemental Material: Geoelectric evidence for a wide spatial footprint of active extension in central Colorado
Supplemental Material: Geoelectric evidence for a wide spatial footprint of active extension in central Colorado Open
Additional information pertaining to methodology and results.
View article: Supplemental Material: Geoelectric evidence for a wide spatial footprint of active extension in central Colorado
Supplemental Material: Geoelectric evidence for a wide spatial footprint of active extension in central Colorado Open
Additional information pertaining to methodology and results.
View article: Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent
Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent Open
Three-dimensional inversion of regional long-period magnetotelluric (MT) data reveals the presence of two distinct sets of high-conductivity belts in the Precambrian basement of the eastern U.S. Midcontinent. One set, beneath Missouri, Ill…
View article: Supplemental Material: Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent
Supplemental Material: Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent Open
Additional details of inversion methodology and resolution tests.
View article: Supplemental Material: Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent
Supplemental Material: Magnetotelluric insights into the formation and reactivation of trans-crustal shear zones in Precambrian basement of the eastern U.S. Midcontinent Open
Additional details of inversion methodology and resolution tests.
View article: Modeling geomagnetic induction in submarine cables
Modeling geomagnetic induction in submarine cables Open
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 possibili…
View article: Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia
Geoelectric constraints on the Precambrian assembly and architecture of southern Laurentia Open
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 Precambr…
View article: 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 Open
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-apat…
View article: 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 Open
A study is made of the relations 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 …
View article: 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 Open
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 …
View article: Event list for intense geoelectric fields identified from EarthScope sites during geomagnetic storms
Event list for intense geoelectric fields identified from EarthScope sites during geomagnetic storms Open
This data set contains properties of intense geoelectric field events identified from 24 EarthScope sites during geomagnetic storms with Dst minima of less than - 100 nT from 2006 to 2019. Columns are the name of EarthScope site that detec…
View article: Event list for intense geoelectric fields identified from EarthScope sites during geomagnetic storms
Event list for intense geoelectric fields identified from EarthScope sites during geomagnetic storms Open
This data set contains properties of intense geoelectric field events identified from 24 EarthScope sites during geomagnetic storms with Dst minima of less than - 100 nT from 2006 to 2019. Columns are the name of EarthScope site that detec…
View article: Down to Earth With Nuclear Electromagnetic Pulse: Realistic Surface Impedance Affects Mapping of the E3 Geoelectric Hazard
Down to Earth With Nuclear Electromagnetic Pulse: Realistic Surface Impedance Affects Mapping of the E3 Geoelectric Hazard Open
An analysis is made of Earth‐surface geoelectric fields and voltages on electricity transmission power‐grids induced by a late‐phase E3 nuclear electromagnetic pulse (EMP). A hypothetical scenario is considered of an explosion of several h…
View article: Magnetotelluric Sampling and Geoelectric Hazard Estimation: Are National‐Scale Surveys Sufficient?
Magnetotelluric Sampling and Geoelectric Hazard Estimation: Are National‐Scale Surveys Sufficient? Open
At present, the most reliable information for inferring storm‐time ground electric fields along electrical transmission lines comes from coarsely sampled, national‐scale magnetotelluric (MT) data sets, such as that provided by the EarthSco…
View article: Origin and significance of seismic discontinuities in the continental upper mantle: An interdisciplinary study
Origin and significance of seismic discontinuities in the continental upper mantle: An interdisciplinary study Open
<p>&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; The mid-lithosphere discontinuity (MLD) and the lithosphere-asthenosphere-boundary (LAB) are two we…
View article: Sources of hazardous geoelectric fields in the United States during magnetic storms
Sources of hazardous geoelectric fields in the United States during magnetic storms Open
<p>Geomagnetic perturbations related to various phenomena in the near-Earth space environment can induce electric fields within the electrically conducting Earth. The geoelectric field is an important link between magnetospheric/iono…
View article: &amp;#8220;The Detailed Emissions Scaling, Isolation, and Diagnostic (DESID) module in the Community Multiscale Air Quality (CMAQ) Modeling System version 5.3&amp;#8221; by Benjamin N. Murphy et al.
&#8220;The Detailed Emissions Scaling, Isolation, and Diagnostic (DESID) module in the Community Multiscale Air Quality (CMAQ) Modeling System version 5.3&#8221; by Benjamin N. Murphy et al. Open
Polutant emissions are a key input of chemical transport models, and many applications of these models require emissions modifications.The preparation and perturbation of input emissions is thus an important task for the use of chemical tr…
View article: Simultaneous Observations of Geoelectric and Geomagnetic Fields Produced by Magnetospheric ULF Waves
Simultaneous Observations of Geoelectric and Geomagnetic Fields Produced by Magnetospheric ULF Waves Open
Geomagnetic perturbations ( B G E O ) related to magnetospheric ultralow frequency (ULF) waves induce electric fields within the conductive Earth—geoelectric fields ( E G E O )—that in turn drive geomagnetically induced currents. Though nu…
View article: Exploring the Influence of Lateral Conductivity Contrasts on the Storm Time Behavior of the Ground Electric Field in the Eastern United States
Exploring the Influence of Lateral Conductivity Contrasts on the Storm Time Behavior of the Ground Electric Field in the Eastern United States Open
The intensification of the fluctuating geomagnetic field during space weather events leads to generation of a strong electric field in the conducting earth, which drives geomagnetically induced currents (GICs) in grounded technological sys…
View article: Geomagnetism Program research plan, 2020–2024
Geomagnetism Program research plan, 2020–2024 Open
First posted September 11, 2020 For additional information, contact: Director, Geologic Hazards Science CenterU.S. Geological SurveyBox 25046, MS 966Denver, CO 80225 The Geomagnetism Program of the U.S. Geological Survey (USGS) monitors ge…
View article: Synthesizing Seemingly Contradictory Seismic and Magnetotelluric Observations in the Southeastern United States to Image Physical Properties of the Lithosphere
Synthesizing Seemingly Contradictory Seismic and Magnetotelluric Observations in the Southeastern United States to Image Physical Properties of the Lithosphere Open
Although seismic velocity and electrical conductivity are both sensitive to temperature, thermal lithosphere properties are derived almost exclusively from seismic data because conductivity is often too strongly affected by minor highly co…
View article: Source biases in midlatitude magnetotelluric transfer functions due to Pc3-4 geomagnetic pulsations
Source biases in midlatitude magnetotelluric transfer functions due to Pc3-4 geomagnetic pulsations Open
The magnetotelluric (MT) method for imaging the electrical conductivity structure of the Earth is based on the assumption that source magnetic fields can be considered quasi-uniform, such that the spatial scale of the inducing source is mu…