This is the island of Anak Krakatau. The original island of Krakatau was destroyed on Aug. 26, 1883 in one of the largest explosions in recorded history. Rated 6 on the VEI, it produced tidal waves that travelled across the Pacific and killed thousands of people. Additionally, the resulting temporary climatic changes were noted in literature of the period, such as the cold Christmases in Dickens' A Christmas Carol. See below for a map showing original outline of the island, compared to now.
A final note: Karakatau was loud. Really loud. The captain of a British warship somewhere near the Canary Islands heard the explosion, and thought it to be distant naval gunfire.