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. Alder groves provide excellent protection from the winds on Popof Island. The perforated aluminum cone covers the box and helps reduce wind noise.
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.