We monitor the Earth's magnetic field. Using ground-based observatories, we provide continuous records of magnetic field variations; disseminate magnetic data to various governmental, academic, and private institutions; and conduct research into the nature of geomagnetic variations for purposes of scientific understanding and hazard mitigation.
Rocks Under I-95 Present Odd, and Scary, Threat to Power Grid
A soon-to-be-published USGS publication points out geomagnetic hazards in the Eastern U.S. (Bloomberg News Story)Read the story.
The Electric Storm of November 1882
Strange things started happening on November 17, 1882, and no one knew quite what to make of it.(image from Baranyi et al., 2016)Read the story.
New 3D Measurements Improve Understanding of Geomagnetic Storm HazardsRead story.
Science for a Risky World: A USGS Plan for Risk Research and Applications – USGS publishes strategic plan for examining risk
USGS explores opportunities to advance its capabilities in risk assessment, mitigation, and communication in new strategic plan.
Learn About USGS Hazards Science and More About National Preparedness Month: The very nature of natural hazards means that they have the potential to impact a majority of Americans every year. USGS science provides part of the foundation for emergency preparedness whenever and wherever disaster strikes.
Geoelectric hazard maps for the Pacific Northwest
Maps of extreme value, horizontal component geoelectric field amplitude are constructed for the Pacific Northwest United States (and parts of neighboring Canada). Multidecade long geoelectric field time series are calculated by convolving Earth surface impedance tensors from 71 discrete magnetotelluric survey sites across the region with...Love, Jeffrey J.; Lucas, Greg M.; Kelbert, Anna; Bedrosian, Paul A.
On the feasibility of real-time mapping of the geoelectric field across North America
A review is given of the present feasibility for accurately mapping geoelectric fields across North America in near-realtime by modeling geomagnetic monitoring and magnetotelluric survey data. Should this capability be successfully developed, it could inform utility companies of magnetic-storm interference on electric-power-grid systems. That real...Love, Jeffrey J.; Rigler, E. Joshua; Kelbert, Anna; Finn, Carol A.; Bedrosian, Paul A.; Balch, Christopher C.
Geoelectric hazard assessment: the differences of geoelectric responses during magnetic storms within common physiographic zones
Geomagnetic field data obtained through the INTERMAGNET program are convolved with with magnetotelluric surface impedance from four EarthScope USArray sites to estimate the geoelectric variations throughout the duration of a magnetic storm. A duration of time from June 22, 2016, to June 25, 2016, is considered which encompasses a...Cuttler, Stephen W.; Love, Jeffrey J.; Swidinsky, Andrei