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After collecting a sample from the well using the narrow sampler shown, HVO staf

By Volcano Hazards Program
image related to volcanoes. See description
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Detailed Description

After collecting a sample from the well using the narrow sampler shown, HVO staff transfer the water sample into a container. The water is collected periodically for chemical analyses so that changes in the water composition can be tracked. For more information about the Keller Well, please see HVO's Dec. 20, 2018, "Volcano Watch" article: https://volcanoes.usgs.gov/observatories/hvo/hvo_volcano_watch.html?vwi…. USGS photo by L. DeSmither.

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Public Domain.