Hello Chip - Which webicorder? Do you mean Iliamna? There was a regional tectonic event at about that time - not volcanic. Thanks for your interest, Cheryl -------- Chip McElhany wrote: Was the event registered on the webicorder on Thursday night between 2200 and 2300 some sort of eruption? -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050