Upgrade of AVO's Sand Point infrasound array, Oct 2019. This 6-element listening array is designed to detect explosive activity at Pavlof Volcano, 90km (56 mi) to the west. The infrasound sensors each have 2 ports to the outside of their cases.
Image courtesy of the AVO/UAF-GI.Please cite the photographer and the Alaska Volcano Observatory / University of Alaska Fairbanks, Geophysical Institute when using this image.
Full Resolution.