Weekly Volcano Watch: 5 March 2009 [Take 2]

Latest U.S. Volcano Alerts and Updates for Thursday, Mar 5, 2009 at 06:40:05 PST

• 2009-03-04 21:10:53 Okmok Advisory Yellow
• 2009-03-04 21:10:53 Redoubt Watch Orange
• 2009-03-04 21:10:53 Cleveland Advisory Yellow
• 2009-03-04 18:12:28 Kilauea Watch Orange
• 2009-03-04 18:07:36 Long Valley Volcanic Center Normal Green
• 2009-03-04 00:35:04 Yellowstone Normal Green
• 2009-03-03 01:05:40 Mauna Loa Advisory Yellow
• 2009-03-01 22:16:06 Anatahan Normal Green
• 2009-02-27 14:55:39 Cascade Range Normal Green
• 2009-02-13 23:24:07 Shishaldin Normal Green

Volcano Hazards Program Webcams page links to webcams at 19 of the 169 active volcanoes in the U-S.

Volcanic Activity Report: 25 February-3 March 2009

Source: SI / USGS Weekly Volcanic Activity Report

New activity/unrest:

• Chaitén, Southern Chile
• Koryaksky, Eastern Kamchatka
• Okmok, Fox Islands
• Sakura-jima, Kyushu

Volcano of the Week: Jan Mayen

Remote Jan Mayen Island, located in the Norwegian Sea along the Mid-Atlantic Ridge about 650 km NE of Iceland, consists of two volcanic complexes separated by a narrow isthmus. The large Beerenberg basaltic stratovolcano (Nord-Jan) forms the NE end of the 40-km-long island, which is ringed by high cliffs. Beerenberg is a large 2277-m-high glacier-covered stratovolcano with a 1-km-wide summit crater and numerous cinder cones that were erupted along flank fissures. It is composed primarily of basaltic lava flows with minor amounts of tephra. Historical eruptions at Beerenberg date back to the 18th century. The Sor-Jan group of pyroclastic cones and lava domes occupies the SW tip of Jan Mayen. The Holocene Sor-Jan cinder cones, tephra rings, and trachytic lava domes were erupted from short fissures with a NE-SW trend. Photo by Gernot Hecker, 2005 (Wikimedia Commons). Caption: GVP.

• Volcano: Jan Mayen
• Country: Norway
• Subregion: Jan Mayen Island
• Volcano Type: Stratovolcano
• Last Known Eruption: 1985
• Summit Elevation: 2,277 m (7,470 feet)
• Latitude: 71.08°N (71°5’0″N)
• Longitude: 8.17°W (8°10’0″W)

Ongoing Activity:

• Colima, México
• Galeras, Colombia
• Karymsky, Eastern Kamchatka
• Kilauea, Hawaii (USA)
• Redoubt, Southwestern Alaska
• Santa María, Guatemala
• Shiveluch, Central Kamchatka (Russia)
• Soufrière Hills, Montserrat
• Suwanose-jima, Ryukyu Islands (Japan)
• Tungurahua, Ecuador