Scientist tests instrument to collect ground-based magnetotelluric (MT) data

A USGS geophysicist measures contact resistance on electrodes at a temporary magnetotelluric site. The electrodes require electrical contact with the ground and are buried in shallow holes about the width and depth of a spade head. Data collected by the instruments will help to image the structure and fluids beneath the surface of Kīlauea. This project has been permitted by Hawai‘i Volcanoes National Park and is funded by the Additional Supplemental Appropriations for Disaster Relief Act of 2019 (H.R. 2157). USGS photo by M. Cappos.