We are not experienced enough to judge where the boil comes from, but the attached photo (if it is not too big - 60 Kbyte) seems to indicate main vent. It was taken on July 28th at 11:31 pm UK time just before the Daisy eruption. -------------- next part -------------- An HTML attachment was scrubbed... URL: </geyser-list/attachments/20050801/ad80ef2f/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: DSC_0249.JPG Type: image/jpeg Size: 61972 bytes Desc: not available URL: </geyser-list/attachments/20050801/ad80ef2f/attachment.jpe>