Kilauea Iki is the smaller of the two caldera at the summit of the world's most active volcano, Kilauea, which has been erupting continuously since 1983, not from the summit, but from Pu'u O'o, a vent further down the mountain on the eastern rift.
As the eruption site is currently not approachable, I chose to show the site of the most spectacular eruption in the past 50 years: Kilauea Iki. I shot this at 9:30 in the morning on Sept. 24th during a period of very heavy "Vog" (haze mixed with volcanic emissions) that is apparant in the eastern sector of the panorama. The black band you see around the periphery denotes the highest level the lava lake reached during the 1959 eruption. It then shrunk upon cooling to the level you see here.