Acoustic Flow Monitor station (in housing), which detects ground vi...
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Detailed Description
Berm from a 1997 lahar is visible along the channel. Mount St. Helens' east crater wall is visible in the background.
Sources/Usage
Public Domain.
Berm from a 1997 lahar is visible along the channel. Mount St. Helens' east crater wall is visible in the background.
Public Domain.