Hello Michael - Everything I know about that event is on this page: https://www.avo.alaska.edu/volcanoes/activity.php?volcname=Carlisle&eruptionid=330&page=basic As Pete and Scott were climbing Cleveland, and observed steaming at Carlisle, it's unlikely that they were mistaking steaming at Cleveland for being at Carlisle. The Carlisle eruption was reported by Coast Guard pilots, who are typically pretty good with their navigation and landmark names. It remains a little uncertain, but this is the best information we have. Cheryl Cameron -------- Michael Firth wrote: I was reading a GVP bulletin report on the 1987 eruption of Mt Cleveland and noticed there was some uncertainty about the source of an ash cloud on 28th August 1987, mentioning it seemed to be about 15km west of Cleveland. Since Herbert volcano is about that distance although to the southwest, could that ash cloud have come from Herbert instead of Cleveland? Also, on the same day, there was a report about steaming from the summit of Carlisle volcano, with no mention of it possibly being from Cleveland (which was also steaming at the same time). Can you clarify if both volcanoes are considered to have been steaming or just Cleveland? Thanks in advance. -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050