Hello Scott - This is the answer an AVO seismologist gave me: "I suspect that most of the signal on station LSSE is not seismicity. There do appear to be some local events as well. Most of those events do not appear to correlate with the LSSE signal (e.g. June 29 at ~18:26 UTC and June 30 at ~10:06 UTC). Some of the local events (e.g. June 30 at ~13:45 UTC) do show up on LSSE as well. In those cases the signal appears to be slightly different from that background signal. Later ~18:24-21:34 UTC on June 30 there was a small swarm of local events. The strange signal at LSSE was longer present at this time. So to summarize I don't believe the strange kind of repeating signal at LSSE was seismic though I can't say this is definitely the case. I don't really know what it is. We have seen this sort of thing before." Our seismic data from Little Sitkin is intermittent enough that we do not consider Little Sitkin to be "seismically monitored" although we do keep a close eye on the data that we do have. Thanks for your interest, Cheryl -------- Scott wrote: Hi Folks, Just wondering if anyone was noticing the LSSE spectrogrpah output lately. That activity appears to be registering faintly at LSSA, LSPA, and LSNW too. Just wondering if that is seismicity, telemetry error, cultural, or what... Thanks -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050