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Applications of the magnetotelluric (MT) method: imaging volcanic, geothermal and tectonic processes in the North Island, and power transmission threats in the South Island

Geoscience Society of New Zealand Branch Talk

by Weibke Heise (GNS Science)

The magnetotelluric (MT) method uses natural variations of magnetic and electric fields at the Earth’s surface to investigate the electrical conductivity structure of the Earth, from the near surface to mantle depth. Since rocks that contain fluids (or are partially melted) are orders of magnitude more conductive (or less resistive) than otherwise, the MT method is fine-tuned for understanding the role of fluids in tectonic, volcanic and geothermal processes. This talk will summarise long-term research projects on the North Island (Fig 1) undertaken at GNS Science over the past decade, concluding with a new study on the lower South Island initiated in 2021 (led by Otago Uni) to understand the hazard to NZ’s national (electric power transmission) grid caused by Geomagnetic Induced Currents (GIC) during large solar storms (aka solar tsunamis!).

The talk will also be available live via Zoom at the following link:

https://otago.zoom.us/j/9687781320?pwd=dHZDSEtEOEJSeGx4MTM3RjJhQ3FSdz09

Date Thursday, 22 April 2021
Time 5:00pm - 6:30pm
Audience Public,All University
Event Type Lecture
CampusDunedin
DepartmentGeology
LocationBenson Common Room (Gn9), Geology Building, University of Otago, Dunedin
CostFree
Contact NameGeology Office
Contact Emailgeology@otago.ac.nz
Websitehttps://otago.zoom.us/j/9687781320?pwd=dHZDSEtEOEJSeGx4MTM3RjJhQ3FSdz09

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