Using terrestrial radar system at Kīlauea
By Hawaiian Volcano Observatory
January 2023 (approx.)

Detailed Description
Dr. Lis Gallant deploying a terrestrial radar system during the January 2023 eruption of Kīlauea. This instrument can detect small-scale changes in the shape of the lake’s surface and calculate the speed at which those changes are occurring. USGS photo.
Sources/Usage
Public Domain.