Okmok is located near Dutch Harbor, Alaska and is a large shield volcano with two prominent calderas at the top. In fact, whenever I see pictures of the caldera, I am reminded of what Crater Lake (Oregon) might look without the water. These calderas formed ~12,000 and 2,050 years ago but most recent eruptions have been from scoria cones from within the caldera. The last eruption at Okmok was in 1997, a VEI 3, with the next previously eruption in 1986 (VEI 2). Now, before everyone gets excited because that makes ~10 years between the last three eruptions, the one prior to 1986 was in 1983. So much for patterns!