Holuhraun lava in daylight. Screenshot from a video by Kristinn Ingi Pétursson,

The Long Wait?

Yesterday, the Bardarbunga crisis celebrated its first month. As our readers have already remarked, the IMO has put out an update that summarises the earthquake data over the past month. In all, some 25,000 earthquakes have been registered by the automated system of which no less than 5,900 have been manually checked by a seismologist.…

Fumaroles on the north flank of Mount Chiginagak
Photo courtesy Robert Dreeszen, March 28, 2014,  http://www.avo.alaska.edu/images/image.php?id=58161

Mount Chiginagak

Mount Chiginagak sits some 600 km southwest of Anchorage, roughly situated on the Alaska Peninsula between Aniakchak and the Katmai Volcanic Complex.  It is a single peak that tops out at just over 2,200 M.  The peak itself is composed primarily of andesitic and pyroclastic layers.  It also has basalt lava flows with some evidence…

Volcano Chiles, photo by Bernardo Andrade Tapia (Wikimedia commons).

Cerro Negro and Chiles, trembling twins

The the peaks of Cerro Negro de Mayasquer (not Cerro Negro, Nicaragua) and Chiles are black and white twins in a volcanic complex on the border of Colombia and Ecuador in the Municipality of Cumbal south of the Department of Nariño. Cerro Negro is a stratovolcano with a 1.8 km crater opening to the west. Andesitic and dacitic…

The Katmai complex looking west to east, with Naknek Lake in the foreground, Mt. Griggs and the Valley of Ten Thousand Smokes in the Background.  Photo courtesy AVO, USGS, Cyrus Read, May 9, 2010, http://www.avo.alaska.edu/images/image.php?id=19771

The Katmai Volcanic Complex

First an appropriately weasel-worded disclaimer….. The Katmai Volcanic Complex is one of the most complex, interconnected volcanic structures in the US. Within an area of 300 km2, it has five major stratovolcanoes, a caldera, and a dome marking the site of the largest eruption in the 20th Century – the Katmai – Novarupta eruption of…