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Ecuador volcano spews giant ash column
QUITO (AFP) - Ecuador's Cotopaxi volcano, which began erupting in August after being dormant for 138 years, on Thursday coughed up a two-kilometer-high column of ash, officials said.
The giant ash column was visible from Quito, 45 kilometers (30 miles) to the north of the volcano, considered one of the world's most dangerous because its snow cap is vulnerable in an eruption and because of its close proximity to densely populated areas.
Ecuador's security coordination ministry said ash rose 2,000 meters above the volcano's crater, and warned some could fall on Quito's southern neighborhoods.
Cotopaxi, one of eight active volcanoes in Ecuador, last erupted in 1877.
The government declared a state of emergency in August after the volcano roared to life and has been conducting evacuation drills among the population.
An estimated 325,000 people could be affected if the eruption triggers mudslides and avalanches, according to the authorities.
Mount St. Helens study confirms three more magma chambers
Scientists release findings of latest research into plumbing below volcano
LONGVIEW — Scientists have released the first results of a pioneering, $3 million study of the plumbing below Mount St. Helens, and they shed light on how the volcano may have erupted in 1980.
The study has found three more magma chambers, or reservoirs, below and east of the peak. Scientists before had only been able to confirm one immediately below the crater, though they had suspected the existence of the others.
The findings, released Tuesday, show the volcano’s plumbing system is far more complex than geologists thought and that the molten rock that fueled the 1980 explosion may have come from much deeper underground. And it didn’t have a straight path to the surface.
Instead, as earthquakes cracked solid rocks, the magma may have twisted and turned between three different pools of magma.
So far, researchers think they’ve identified four magma chambers in the vicinity of the summit: the previously known small chamber right beneath the crater; two chambers 3 to 8 miles below sea level; and one larger chamber 9 to 25 miles below sea level that extends as far east as the Indian Heaven Wilderness. Researchers said there’s still no evidence yet that the big pool of molten rock fuels other volcanoes, such as Mount Adams or Mount Rainier.
Three of the chambers appear to be connected, though, because earthquakes that occurred before and during the 1980 eruption moved up along the edge of the biggest magma chamber and into the upper chamber below the mountain, Rice University geophysicist Alan Levander said. This understanding could help scientists better track rising magma the next time the volcano acts up.
Mexico: Colima volcano has another double eruption
Less than a week after a pair of eruptions, Mexicos Colima or Fire volcano pulled of the feat again on Tuesday (10 November) morning, as its period of activity continues.
According to officials, the first eruption occurred at 7.03am local time, sending a column of ash and smoke some 2,500m into the sky. National Civil Protection coordinator Luis Felipe Puente said on his Twitter account that ash and smoke rose 2,000m above the crater of the volcano during the second explosion, which occurred at 9.02am local time.
Located in the south-western Mexican state of Colima, the Fire Volcano has been exhibiting continuous activity since 9 July. Over the past months, nearby villages have been blanketed with thick coats of ash, prompting evacuations.
Researchers said there’s still no evidence yet that the big pool of molten rock fuels other volcanoes, such as Mount Adams or Mount Rainier.
Last night Nicaragua’s Momotombo started its first eruption since 1905. The vigorous Strombolian eruption (see above and below) produced an impressive lava fountain along with a dark ash plume over the area near Lake Managua. Local reports suggest that people started feeling tremors and noticing steam plumes from Momotombo over the past few weeks. Then, late on Monday night, a new eruption began, sending incandescent volcanic debris cascading down the slopes of the volcano. By morning, the activity had waned, though a strong steam plume can still be spotted coming from the volcano on the INETER webcam pointed at Momotombo. At least six communities around Momotombo reported ash fall and as a precaution, schools in the region have been closed.
Up until 1905, Momotombo was one of Nicaragua’s most active volcanoes. Between 1849-1905, the volcano produced 10 eruptions and in 1605, Momotombo had a major eruption that destroyed the then-capital of the region, Leon Viejo. This has been a noisy week for volcanoes in Central America. Fuego and Santiaguito in Guatemala both had moderate eruptions, with Fuego’s in particular producing an impressive lava fountain. Meanwhile, a small ash plume was spotted earlier in November from Telica, one of Nicaragua’s other active volcanoes, as part of its restless 2015. None of these volcanoes are connected in any way beyond the fact that they lie in the same tectonic setting, where the Cocos Plate is subducting beneath the Caribbean Plate.
Two of Mexico’s volcanoes rumbled to life on Saturday (January 23), spewing large plumes of ash and smoke high into the sky.
Meakandake is an andecitic composite volcano group formed at the SW crater wall of the Akan caldera, located at the eastern part of Hokkaido. Nakamachineshiri crater, located at the center of the group, and Ponmachineshiri crater, located at the summit, have vigorous sulfuric activities and there are many sulfuric fumaroles and hot springs at the flank and the foot of the volcano. www.data.jma.go.jp...