Hello Shawn - It was near Iliamna, not Spurr, and is a tectonic earthquake (75 miles deep), not related to volcanism. We have not noticed any changes at any of the Cook Inlet volcano in response to this earthquake. See the Alaska Earthquake Center for more information: http://earthquake.alaska.edu/event/13507245 -------- Shawn King wrote: On the IRIS seismic monitor, I noticed a 4.7 quake in Alaska. When I zoomed in on the satellite image I noticed it was very close to the volcano. I believe it was Mt Spurr. Could have been Redoubt, but from what I gathered, I was looking at Spurr. Anyway, a quake this close could possibly trigger an eruption, or like here in Washington State, a large landlside on the volcano such as what happened with Mt Saint Helens. I study volcanos, and seismic activity on a daily basis, but since this just happened today with the quake near Spurr I have no information. If you noticed any activity on that Volcano after the quake, could you please email me a short description. Also, compare the satellite images of the lahars in satellite images to those of Mt Rainier. It's obvious that Spurr has had some large deposits, I'm just comparing the two right now, and their footprint is quite similar from what I see. I was studying Rainier from satellite images, and can, without pulling up historical information, tell which deposits are newest and which are oldest. Would greatly appreciate any information on how the earthquake today has any effect on future eruptions. I'm pretty tired so forgive my rambling, I just really enjoy volcanism and seismology. If I had the chance to go back to school in my 20's, this would definitely be my passion. I have a few theories about the plates near the Mariana Islands that could make seismologists rethink just how large an earthquake and Tsunamis may be. Hours upon hours of studying satellite images of the sea floor, along with watching earthquake activity on a daily basis. I injured my back in 2007 and needed something to kill time. I ended up finding a passion for volcanism, seismology and geology. Just like the way the puzzle of the Cascadia Subduction Zone and Tsunami in 1700 was theorized and proven, I have a theory about the movement of the ocean floor near the Mariana Island that could turn Geology and Seismology on it's head. I also have theories about why the New Madrid Zone is a hotbed of seismic activity, and is so mysterious since it sits in the middle of a continental plate. That's what I do, solve puzzles by looking outside the box. It's why finding out about Mt Spurr, whether or not the 4.7 quake caused any activity at the volcano, is so important. Whether it's landslides or glaciers breaking apart, it adds another piece to my puzzle. Recently, I noticed a pattern in California and Oregon, and told my friends on Facebook to watch out for around Vancouver island BC, because the pattern of quakes I noticed were migrating northward, The next day a 4.8 hit on the South end of Vancouver Island. I see these patterns on the IRIS Seismic Monitor and the USGS site for California, as well as in the Pacific NW Seismic Network. I can't always cal them, but I've been pretty accurate when I do catch them. It's like seeing a clock tick, but I watch the quakes and can see what is coming. I know, sounds weird, but I see rises in activity, then a decrease, and can pinpoint what area is going to release energy next. Not predicting quakes, just observations and seeing potential for earthquake activity. Watch Vancouver Island in the next week or two, and the coast of Oregon. The area around Petrolia, California off the coast of Humboldt County where the three plates come together is primed for some action. I have seen abnormal movement there in the last week, so I'm keeping a close eye there. Sorry for the rambling, and I hope that you can let me know if that earthquake is the start of activity in your area, or just a precursor to a larger quake. Thank for your time, and you guys and girls (if any) keep up the great work. You all do an amazing job at keeping everything running smoothly and keeping us up to date. -- Cheryl Cameron Geologist, Alaska Volcano Observatory Alaska Division of Geological & Geophysical Surveys voice: 907-451-5012 fax: 907-451-5050