[glennon]

Over 60 observations of this hot spring erupting in some fashion over the last 18 years. https://geysertimes.org/geyser.php?id=Black+Diamond Many of the reports mention black water and rocks and "big" -- so not particularly rare. This eruption appears to be larger though -- typically the rocks and debris do not make it to the boardwalk.

[glennon]

A geyser gazer friend of mine shared the following image pair: a "before" Google Earth image and a USGS overhead image captured today after the event. The debris field surrounding the spring is evident -- including the damaged boardwalk. (links to a png) https://drive.google.com/file/d/1Dcd55YX7oF8KPrHsog75vPS_Mc9...