That’s resuspended ash from earlier eruptions. Yes, volcanoes can still be hazardous decades after they erupt. Several weeks ago, the Alaska Volcano Observatory noted resuspended
Volcanologists at the University of Mexico released a bulletin (Spanish) this morning; here is the Google Translate version. Click the link in the top menu
See update at bottom of post, or click the Popocatepetl link at the top of this page. This is a 2011 view of nearby Popocatepetl
It’s beautiful; in a way, it makes you proud of Earth for being able to produce such a thing. It’s terrifying, when you look at
Update, September 18, 2018: It’s over–the storm, I mean. Now comes the part that doesn’t make headlines, but is so very hard to deal with.
August 30, 2018, update: This uptick in restlessness is too slight for CENAPRED to raise the volcano alert level, but it’s interesting and worth keeping