July 15, 2013 – Significant Volcanoes of the United States Over the last 6372 Years, by State: I downloaded all significant volcanic eruptions from 4650 B.C. to 2012 and graphed the 33 that occurred in the U.S. by State (above). Over half (18) occurred in Alaska, nine in Hawaii and two each in the Mariana Islands, Washington State and the Admiralty Islands.
The Mariana Islands were acquired during WWII and are composed of two U.S. Territorial Jurisdictions: (1) The Commonwealth of the Northern Mariana Islands and (2) The Territory of Guam. Both Asuncion and Sarigan (picture above) are located in the Philippine Sea.
The volcanic eruptions listed for Washington State are the same volcano – Mount St. Helens (picture above). The 1860 B.C. eruption was a colossal VEI 6, while the much studied May 18, 1980 eruption was a powerful VEI 5.
The Admiralty Islands (pictured below) are a group of about 40 volcanic and coral islands in the SW Pacific. They are part of Papua New Guinea, in the Bismarck Archipelago; with the largest island by far being Manus. The U.S. maintains a military base there, which was established during WWII. Near the base, in St. Andrew Strait, a volcano erupted in 150 B.C. and on June 27, 1953.
The Hawaiian Island eruptions:
The nine Hawaiian Island eruptions were as follows: Kilauea – 7, Mauna – 1 and Hualalai – 1. These nine eruptions occurred as early as 1790 and as late as February 10, 2010. Of those three Hawaiian volcanoes, Kilauea (picture above) is the most famous, with eruptions almost daily.
The 18 Alaskan eruptions are divided into four groups as follows: (1) The Aleutian Islands – 6, (2) Alaska SW – 6, (3) the Alaskan Peninsula – 4, and (4) Alaska East – 2. Some of the more famous Alaskan Volcanoes are Augustine, Redoubt and Cleveland. The last Alaskan eruption in the database is from Redoubt (pictured below) on March 23, 2009.
(Credits: The Smithsonian National Museum of Natural History, the National Oceanographic and Atmospheric Administration (NOAA), Summary narrative and top graphic – W. G. Foster).
The Master of Disaster