Volcano news: Colima Volcano (Mexico)
Colima volcano (Mexico): activity report - less pyroclastic flows, but explosions
Montag Jul 13, 2015 21:36 | VON: T
Ash explosion from Colima todayThe volcano's activity at least seems to have quieted down and changed in style, now producing less rock avalanches and pyroclastic flows (as result of lava extrusion and overspilling), but more intermittent explosions.
Field report: activity of pyroclastic flows rapidly increased on Saturday 11 July, with powerful pyroclastic flows that traveled as far as approx. 10 km, mainly into the ravines of La Lumbre and Montegrande on the SW and S sides. When arriving in Colima Sunday noon, pyroclastic flows on the southern side were nearly continuous although only the base of the volcano was visible. In the course of the evening and the night, this activity decreased a lot. Judging from diffuse glow visible through cloud cover, it seems a coherent lava flow was active on the upper S side.
Today, no pyroclastic flows have been seen (but most of the time, the volcano has been in clouds), but several moderately sized ash plumes rose from the summit, presumably caused by explosions.
Activity from Sat-Sun night by our friend Osiris from Colima:
Freitag, Jul 10, 2015
A new eruptive phase has started at the volcano earlier this month. A new lava dome started to grow quickly in the summit crater and has been producing frequent explosions, glowing avalanches and pyroclastic flows (video): ... [mehr]
Mittwoch, Jun 03, 2015
Explosions of various sizes continue to occur from the volcano's summit vent. A particularly spectacular one this morning around 06:10 local time showered the summit cone with incandescent material and triggered small pyroclastic flows: ... [mehr]
Sonntag, Mai 24, 2015
Explosions continue to occur from time to time. On 16 May an ash plume rose from Colima to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted 95 km ESE before dissipating. ... [mehr]
Sonntag, Mai 03, 2015
Explosions continue to occur, but have decreased in intensity and frequency. [mehr]
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