The Hawaiian Volcano Observatory (HVO) is a volcano observatory located at Uwekahuna Bluff on the rim of Kīlauea Caldera on the Island of Hawaiʻi. The observatory monitors four active Hawaiian volcan… Hawaiian Volcano Observatory – Wiki Article – wikiplays.org Original @ http All Information Derived from Wikipedia using Creative Commons License: en.wikipedia.org Author: Hawaii Volcano Observatory, USGS Image URL: en.wikipedia.org ( This work is in the Public Domain. ) Author: W Nowicki Image URL: en.wikipedia.org ( Creative Commons ASA 3.0 ) Author: W Nowicki Image URL: en.wikipedia.org ( Creative Commons ASA 3.0 )