Volcano news: Colima Volcano (Mexico)
Colima volcano (Mexico): lava effusion and vulcanian explosions
Monday Oct 10, 2016 17:50 PM | DOOR: T
Explosion at Colima yesterday (webcams de Mexico)The activity at the volcano remains intense although seismic measurements seem to indicate a gradual decrease over the past days. Since the start of the second phase of lava dome growth since 5 Oct, a second viscous lava flow has been descending on the southern slope, more or less overriding the first lava flow.
At the same time, explosions at the summit crater have become more frequent and stronger in size, often producing plumes of 1-2 km height:
What causes the gradual shift to explosive activity is likely a result of several factors: a slightly changed (increased) gas content in the magma in combination with changes (probably slower) ascend rate and blockage of the conduit by the emplaced dome itself, allowing gas pressure to build up more efficiently.
Monday, Oct 10, 2016
Sunday, Oct 09, 2016
Sunday, Oct 09, 2016
Saturday, Oct 08, 2016
The effusion of the viscous lava dome spilling over the southwestern rim as a broad lava flow continues at the volcano. ... [meer...]
Thursday, Oct 06, 2016
Background:Colima volcano is one of the most active in North America and one of the potentially most dangerous ones. It has had more than 30 periods of eruptions since 1585, including several significant eruptions in the late 1990s. Scientific monitoring of the volcano began 20 years ago.
The Colima volcanic complex is the most prominent volcanic center of the western Mexican Volcanic Belt. It consists of two southward-younging volcanoes, Nevado de Colima (the 4320 m high point of the complex) on the north and the 3850-m-high historically active Volcán de Colima at the south.
A group of cinder cones of probable late-Pleistocene age is located on the floor of the Colima graben west and east of the Colima complex. Volcán de Colima (also known as Volcán Fuego) is a youthful stratovolcano constructed within a 5-km-wide caldera, breached to the south, that has been the source of large debris avalanches. Major slope failures have occurred repeatedly from both the Nevado and Colima cones, and have produced a thick apron of debris-avalanche deposits on three sides of the complex. Frequent historical eruptions date back to the 16th century. Occasional major explosive eruptions (most recently in 1913) have destroyed the summit and left a deep, steep-sided crater that was slowly refilled and then overtopped by lava dome growth.
Source: GVP, Smithsonian Institute - Colima information