BackgroundKauai Island is composed of a single large eroded shield volcano with a summit caldera 15-20 km in diameter and two flank calderas. Large Pliocene debris avalanches extended to the north and south. The spectacular Waimea Canyon and Napalm cliffs on the NW coast are products of extensive erosion. Most of the volcano is of Pliocene age; however, rejuvenation of activity during the Pleistocene produced lavas and cones over the eastern two-thirds of the island Potassium-Argon dated 1.40-0.6 million years ago (Macdonald and Abbott 1970).
Source: Smithsonian / GVP volcano information
See also: Sentinel hub | Landsat 8