Hello Barry - Here is one article that discuss what you're interested in: http://vulcan.wr.usgs.gov/Outreach/AboutVolcanoes/do_tides_affect_volcanoes.... Some volcanoes (like Pavlof) seem more affected than others. But in all volcanoes, the effect appears very small. Thanks, Cheryl -------- Barry Willis wrote: Sirs, I live in Hawaii--home of Kilauea. I have a theory that the moon's position affects the activity of the active lava. So, the closer the moon, the more influence on the lava and therefore the eruption potential. I can't find any study or discussion on this. So what I expect is that IF an eruption were to happen, it would be when the moon is closest to the earth (high tide, of course). Can you direct me to a source of information for this topic or answer it? Mahalo, Barry -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050