Event Detail

Event Type: 
Applied Mathematics and Computation Seminar
Date/Time: 
Friday, February 5, 2021 - 12:00 to 13:00
Location: 
ZOOM

Speaker Info

Institution: 
USGS
Abstract: 

Estimation of ground-level geoelectric fields has been identified by the electrical power industry as a key
capability in assessment and mitigation of the impacts of space weather on electrical power infrastructure. In
response to this societal need, an operational system to produce locally relevant geoelectric fields is being
developed by the NOAA's Space Weather Prediction Center and the USGS Geomagnetism Program. The first version of
the NOAA-USGS Geoelectric Field Maps data product became operational in Fall 2020, and an improved version is in
development and scheduled for release in Fall 2021. The goal is to provide an accurate, close to real-time
estimation of spatially variable ground-level geoelectric fields everywhere in the contiguous United States. I
will explain, in general terms, the possible uses of such a system, and discuss several alternative approaches
to data-based geoelectric field modeling, as well as the ongoing development and validation efforts. I will
focus on the impact of the solid Earth structure as realized in magnetotelluric impedances, and the work on
geoelectric hazards recently accomplished and in progress at the USGS. I will also provide an update on the
status of the magnetotelluric survey in the United States, the Earth conductivity models and the national
impedance map.

BIO: Anna graduated in mathematics from Cambridge University, UK in 2002 and obtained her Ph.D. in geophysics from Cardiff University, UK in 2006. She subsequently worked at Oregon State University as a postdoctoral associate, research associate, and later an assistant professor, before joining the United States Geological Survey (USGS) in Colorado, USA in 2015. Anna is currently a Research Geophysicist at the USGS Geomagnetism Program. Anna is a participant in the long-standing collaboration between the U.S. Geological Survey and the National Oceanic and Atmospheric Administration (NOAA) Space Weather Prediction Center towards the development of a robust operational Geoelectric Field Maps data product. She also contributes to the sun-to-Earth modeling efforts insofar as they inform estimation of geomagnetically induced currents that constitute a hazard to human-made infrastructure, and is a lead author of a widely used community code for magnetotelluric modeling and inversion (ModEM), as well as the creator and manager of a global database of community magnetotelluric data (ds.iris.edu/spud/emtf).