Hi Scott - We think those signals are wind noise. Thank you, Cheryl -------- Scott Todd wrote: We have a lot of people asking this question in the last day, seeing as spectrographs are showing quite high amplitudes across 2 of the 5 stations. Any input would be helpful, thanks! Scott -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050