Andes
eklemetti | April 8, 2009Llaima in Chile erupting in 2009.
A quick note to pass along about the ongoing eruption at Llaima in Chile. The eruption did seem to be waning earlier in the week, but the news now is that debris from the eruption is partially blocking the vent. The cone of pyroclastic material (tephra) that has been ejected during the eruption is now overlapping the main crater, potentially blocking part of the vent ... and most people know what happens if you plug up a volcano that is actively erupting - blammo!
The SERNAGEOMIN is not certain that this cone of material (in spanish) will cause a more intense…
eklemetti | April 4, 2009Today looks to be a doubleheader of volcano news:
RedoubtImage courtesy of AVO/USGS, taken by Rick Wessels. An infrared image of the north slope of Redoubt showing the hot, new dome material and hot block & ash flows confined to the valley.
At 11:30 AM yesterday, AVO put Redoubt back to Orange/Watch alert status after the volcano seem to settle down to small steam/ash plumes. Less than 12 hours later (at ~6:30 AM Alaska time), the volcano produced another large explosive eruption, sending an ash column up ~50,000 feet / 15 km and producing what seems to be a significant lahar that…
eklemetti | March 13, 2009
2009 has been a busy year for Volcan Galeras in Colombia. The volcano has erupted at least twice this year already vigorously enough to prompt evacuations of the area. Galeras does tend to see cycles of eruptive activity, the last one started in 2000 after seven years of quiet. Many times, the eruptions are more visually impressive than hazardous (see the picture above from January 2008 from INGEOMINAS).
Luckily, Galeras is also once of the most watched volcanoes in South America. The INGEOMINAS (Colombian Geological Survey) staffs the Pasto Volcano Observatory (OVSP) to monitor the volcano…
sb admin | March 12, 2009
Welcome to version 2.0 of Eruptions, the blog on volcanic eruptions and volcano research in general. I've been writing this blog (starting over on Wordpress) over the last year or so, but now it has found a new home here at ScienceBlogs. If you're wondering what to expect if you're new to Eruptions, I'll be bringing news of volcanoes that are erupting worldwide, distilling the scientific jargon, dispelling the misinformation and commenting on what the effects of the eruption(s) might be. I'll also try to bring in any volcanoes in the popular media that gets my attention (alas, it has been…
eklemetti | March 4, 2009
Folks have been suggesting that life on Earth started near volcanic vents for a long time now (and of course, some people don't buy it). Whether or not life sprung forth near hydrothermal vents, undersea black smokers or from the head of Zeus, it doesn't really change the fact that we find organisms living in these places today, expanding what we might consider "habitable" by leaps and bounds. Case and point, researchers from CU-Boulder have recently found a community of micro-organisms happily living near the summit of Volcán Socompa (above) in Chile in the hydrothermal vents. Now, having…
eklemetti | February 25, 2009
The people who remain in Chaiten face the potential for a devasting pyroclastic flow, so says Jorge Muñoz of the SERNAGEOMIN in Chile. The volcano is still producing large ash columns on Tuesday and a flyover of the dome forming inside the caldera has lead to the concern that a collapse on a larger scale than those seen last week could wipe out the town for good.
The government hopes news like this from volcanologists might convince the last remaining residents of Chaiten to leave, but no indication of this has come to pass. In fact, things sound like they're getting heated in the fight…
eklemetti | February 20, 2009
Galeras, in Colombia, appears to have entered a new cycle of activity as it has erupted for the second time in a week. A large explosion occurred this morning that was accompanied by falling ash and rocks (ballistic bombs) from the event. It is unclear how far the volcanic products travelled from the vent, but Colombian officials did raise the alert level back to red and ordered new evacuations.
eklemetti | February 19, 2009
UPDATE 2/19/2009 9:45 AM: Well, it seems that my hunch was at least partially right. Reuters (and Paula Narvaez, special envoy to the Chilean president) is calling the eruption as result of "what appeared to be a partial collapse of its cone."Â So, we might have seen the oversteepening of the dome growing in the Chaiten caldera that lead to a collapse, producing (likely) a pyroclastic flow and either an accompanying plinian eruption as the pressure was released or an ash column associated with the pyroclastic flow itself. Now, I might not take Reuters word for it, but it makes sense…
eklemetti | February 15, 2009
UPDATE 2/15/2009 20:30 PM: Marta Calvache of INGEOMINAS says that seismicity has all but stopped at Galeras after the eruption Saturday night, however the area will be kept on alert for more potential activity. However, even with the eruption, apparently there are very few people in the evacuation centers - never a good sign if something really big were to happen at the restless Colombian volcano. Â
Last night, Galeras, near Pasto in Colombia, erupted, prompting an evacuation of nearly 7,000 people living near the volcano. The first CNN article linked above, for some reason, says that…
eklemetti | February 5, 2009
Bored with waiting for Redoubt to erupt? Well, Nevado del Huila in Colombia looks like it is also on the eruption watch list. A fly-over of Huila performed by Colombian officials (unclear from the article if it was done by National Emergency Management or INGEOMINAS) revealed a large lava dome growing in the crater, suggesting that an eruption might follow considering all the lava being extruded. This eruption might come in the form of an explosion caused by the collapse of this lava done - the collapse itself could generate a pyroclastic flow and the release of pressure on the underlying…
eklemetti | January 27, 2009
The Colombian government has extended the evacuations near Nevado del Huila, taking 800 families out of the danger zone near the rumbling volcano. Huila has been making a lot of noise as of late, and Colombian officials in Ingeominas and the National System for Emergencies are worried that the volcano will erupt soon, sending avalanches and lahars down the valleys of the Paez and Simbola Rivers as happened in November of 2008 (see above or the link to the Volcanism Blog). They also note that Ingeominas is installing microphones on the volcano to detect explosions in the crater to better…
eklemetti | January 24, 2009
It is hard to believe that the eruption at seem to come out of nowhere at Chaiten started over 8 months ago now, and apparently is still not showing many signs of abating. I did get a chance to see some great talks and posters at AGU last month about the Chaiten eruption, with the key points I took away being that Chaiten is erupting a very crystal poor rhyolite (<1% crystals) and that it seems that the source of the magma is relatively deep in the Andean crust. Also, there are some indications that the eruption at Chaiten may have been tectonically instigated - i.e., that earthquakes in…
eklemetti | January 20, 2009
Nevado del Huila continues to cause problems in Colombia. Over 4,000 people had to be evacuated today from the Belalcazar area after the volcano showed new signs of eruption. No description is given to exactly what those signs were/are, however after the lahars in November (2008), it sounds like the Colombian government is not taking chances. Huila has been rumbling for almost two years now after almost 450 years on silence (that we know of) at the volcano.
eklemetti | December 15, 2008I was chatting with a fellow from AVO and he called the simultaneous eruptions of Kasatochi, Cleveland and Okmok a "once in a millennia" event. So, enjoy it!
He also mentioned that the Kasatochi eruption released the most sulfur dioxide into the atmosphere since the 1991 Pinatubo eruption ... but we had an idea of that already.
And who knew that there has been uplift at Uturuncu in Bolivia? I sure didn't, but Steve Sparks does.
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More to come later this week when I can go to all the Chaiten posters.
eklemetti | December 9, 2008
The BBC is reporting today on a study published in Earth and Planetary Science Letters that attempts to establish a connection between large earthquakes and subsequent volcanic eruptions. The study is focussed on large Chilean earthquakes over the last 200 years (Chile has had some of the biggest, hitting M9 on the Richter Scale) and then examining the number of volcanic eruptions that followed. They find that activity increased in the year after the earthquakes. This suggests that many volcanoes might be "primed" to erupt and just need a catalyst like a large seismic event to promote…
eklemetti | November 22, 2008
I have been out of town for the past few days, but we do have some big (and unfortunate) news from Colombia. Nevado del Huila in southwestern Colombia erupted today and the ensuing lahar (or volcaniclastic debris flow - it is hard to tell from the reports) killed at least 4 people, and possibly as many as 10*. We know that Huila has been showing signs of activity, but now it seems like it might have had real eruption, at least to the point that a lahar was produced and possible the creation of a new summit crater. Evacuations are under way and several towns have been cut off as the lahars…
eklemetti | November 13, 2008
Just a brief note, but today (November 13) is the 23rd anniversary of the disastrous lahar at Nevado del Ruiz in Colombia. Over 23,000 people died when a lahar, started by a relatively minor eruption of the volcano, swept down the river valleys the side of the edifice and destroyed Armero and Chinchina. The footage of rescue efforts after the lahar were devastating and heartbreaking (caution: linked video might not be for the faint of heart). Sadly, this disaster was mostly preventable as the citizens of these towns could have had at least an hour's warning to walk to higher ground, but the…
eklemetti | October 15, 2008
There isn't really much information in this report, but Galeras in Colombia has been put on "high alert" for a potential eruption. The volcano did emit a ~2,400 meter steam (and ash?) column today, but beyond this, it is unclear what else might be happening at the volcano.
Galeras is the most active volcano in Colombia, having erupted frequently in the past decade, producing mostly ash falls, ballistic bombs and other explosive volcanic products. It is also located within a few kilometers to Popayán (see photo above of previous activity), a city of ~200,000 people, making it a potentially…
eklemetti | October 7, 2008
Nevado del Huila in Colombia continues to keep officials in the southeast region of the country on their toes as they wait to see what the volcano might do. There was increased seismicity over the weekend according to Jair Cardoso of the Attention, Prevention and Disasters Committee, along with minor steam and ash emissions. The Colombian geological survey, INGEOMINAS, will be sending experts (including Marta Calvache and Cesar Eduardo Lopez) to examine the current state of the volcano and try to decipher what state the magmatic system is in: ready to erupt or just gurgling away.Â
(Of…
eklemetti | September 16, 2008
After the news of a sizable earthquake under Nevado del Huila, we can add Nevado del Ruiz to the list of volcanoes that have been shaken up recently. There was a M5.7 earthquake underneath Ruiz on Saturday (9/13), which is a pretty significant event. However, the earthquake was located at over 100 km depth, so likely it is not related to any magma movement at Ruiz. I will keep my eyes open for any reports of increasing unrest at Ruiz and at Huila in the coming days.