The launch of a new GVP website is scheduled for Monday, May 20, 2013.
The dumbbell-shaped island of Ometepe (also known as Chorotega, meaning "twin peaks") consists of two large stratovolcanoes, Concepción (left) and Maderas (right). The twin volcanoes are seen here from the west, across a 10-20 km wide strait in Lake Nicaragua separating the island from the mainland. The volcanoes were constructed on a basement of lake sediments overlying Tertiary-Cretaceous sediments. The break in slope just below the cloudcap on the left (northern) flank of Concepción is a the rim of a largely buried caldera. Photo by Jaime Incer.
The new website is getting closer! Here's a screenshot.
AVO reported that on 13 May seismicity at Pavlof increased at 0800 commensurate with the presence of an intense thermal anomaly at the summit observed in satellite imagery. On 14 May pilot reports and satellite images confirmed activity; a spatter-fed lava flow advanced about 0.5 km down the N flank.
IG reported that although cloud cover often prevented observations of Tungurahua during 8-14 May, ash plumes were observed almost daily. Strombolian activity was observed on most nights ejecting blocks sometimes 500 m above the crater; blocks that fell onto the flanks rolled as far as 1 km. During 9-10 May lava fountains rose 700 m above the crater.
The Smithsonian's Global Volcanism Program seeks better understanding of all volcanoes through documenting their eruptions — small as well as large — during the past 10,000 years.