historic eruption
eklemetti | May 30, 2008
We've been hearing a lot of conflicting reports about the state and future of the Chaiten eruption. Now ending its fourth week of eruption, Chaiten was said to be easing up a bit, but recent reports have Luis Lara from the SERNAGEOMIN still worried about a potential collapse, followed by a devastating eruption. I'll have to take his word for it as the explanations in the article don't really make a lot of sense. It sounds like both Lara and Dr. Petrinovic (Argentina) are worried about dome collapse, but that would just form large pyroclastic flows ... unless the dome collapses enough to…
eklemetti | May 28, 2008
Some news from the Chaiten eruption. Apparently, LanChile has cancelled some flights around the region of southern Chile due to the ash. They likely implies that the eruption column is bigger than reported by the SERNAGEOMIN on Monday, but the report has little in the way of details. Sounds like the volcano is still huffing and puffing away. Definitely one of the more important and interesting eruptions in the last few hundred years and it has the Cascades Volcano Observatory along with the USGS VDAP buzzing (based on some conversations I've had recently), even almost four weeks in.
eklemetti | May 27, 2008Although the mainstream media seems to have lost interest in the Chaiten eruption beyond the "human interest" (or should I say "salmon interest") aspect of the eruption, there is still a lot going on at the volcano. The SERNAGEOMIN recently released this excellent photo of the erupting caldera:
What is pretty clear here is thank a new rhyolite dome is erupting on top of the old dome. (On a side note, when I was visiting the Smithsonian last week, we were all lamenting the fact that no one has come out and said what composition this lava is? I'm 99% convinced it is rhyolite, e.g., high silica…
eklemetti | May 26, 2008
I'm always amazed by the number of volcanic eruptions captured by satellites that we might not have ever even had known occurred otherwise. Case in point is Rabaul on the island of New Britain in Papua New Guinea. An Aqua satellite captured this shot of Rabaul erupting on May 20th, leaving a gorgeous plume heading off into the Pacific. Sure, most likely someone might have noticed the eruption, but its good to see that we can find eruptions going on even when we're not really looking.
Rabaul is a caldera volcano that is most famous for the simultaneous eruptions of Vulcan and Tavurvur in 1994…
eklemetti | May 26, 2008
I think we know who wins this battle. At Ruapehu (New Zealand), it isn't really the lava that is the problem, but the lahars produced by mixing snow, crater lake water and volcanic debris. However, that is not stopping people from wanting to ski on the volcano. Never ceases to amaze me how people assess the riskiness of activities.
eklemetti | May 19, 2008
It has been rather quiet on the volcano news front over the weekend. A couple tidbits:
- There are some new data showing the sulfur dioxide flux from Mt. Etna (Italy). The image above is an eruption of Etna from 2001 (and it makes a great wallpaper).
- I've heard very little about Chaiten lately, mostly because I don't think much has changed. The last update provided by the SERNAGEOMIN was on 5.16 (in spanish) and pretty much that is exactly what it says: the volcano continues to erupt. Apparently some USGS folks will be arriving on the scene soon as well. Most of the town of Chaiten has…
eklemetti | May 17, 2008
Happy 28th anniversary of the 1980 Mt. Saint Helens eruption. The volcano had a catastrophic collapse of one side of the edifice that triggered the climatic eruption. Enjoy this clip from the CBS News from 3 days after the eruption.
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eklemetti | May 15, 2008
To keep us up to date on the goings-on at Chaiten in southern Chile, well, the volcano is still erupting! Yes, two weeks in and heavy ash is still being erupted from vent. The latest reports are vague, but Chilean officials are saying things like "There's been additional volcanic activity that we're really worried about..." Now, I can only speculate what this means, but this might be an indicate that the SERNAGEOMIN are really beginning to seriously consider that the whole volcano may collapse.
The town of Chaiten, even without a collapse, is pretty much been wiped off the map. 90% of the…
eklemetti | May 14, 2008
A bit busy today, so to borrow from the newest USGS/SI Volcanism Report:
On 12 May, the plume rose to an altitude of 8 km (26,200 ft) a.s.l.
During an overflight conducted by SERNAGEOMIN, four more plumes of a
similar altitude were generated by explosions and drifted NE. Several
hectares of burned vegetation, likely from pyroclastic flows or
lateral explosions, were noted on the N flank of the dome. Small
pyroclastic flows may also have been responsible for completely burned
forest to areas in the NE, and on the W and NW dome flanks. A lahar
caused the banks of the Chaitén River to overflow…
eklemetti | May 13, 2008
I just read a report that the ash column at Chaiten is beginning to collapse. The SERNAGEOMIN says that the ash column is only 4.5 km tall now, as opposed to the 20 km it had reached earlier. Still, there are not reports of pyroclastic flows, but that could be a matter of hours or days at this point. We'll be keeping a close watch on the eruption to see if this is the beginning of the end, or just a lull in eruptive activity, here a full 12 days into the eruption.
UPDATE 12:20 PM (Pacific Time): According to this new article, the SERNAGEOMIN is reporting the first of the column-collapse…
eklemetti | May 12, 2008
While I was looking at the gallery of Chaiten photos, I noticed another headline (in spanish) saying that the SERNAGEOMIN has issued a yellow alert for potential activity at Puyehue. Now, the "article" doesn't offer much besides pictures and maps, but apparently there has been an increase in seismic activity in the vicinity of the volcano.
Puyehue is a volcano in the Andes of southern central Chile and is actually part of a complex with Cordon Caulle. Most of the eruptions in recent history (1990, 1960, 1930s) have been from Cordon Caulle, with the most recent activity at Puyehue appearing…
eklemetti | May 12, 2008
I've been trying to keep up with the Chaiten eruption in Chile, but the news is just beginning to sound like a broken record: eruption continues, ash falls, don't know much else. However, it does sound like Chile is being realistic about people's chances of moving back to the town of Chaiten - 10 km from the vent(s) - in the near future ... and those chances are zero to none. This doesn't entirely surprise me. If the town isn't already buried, when the pyroclastic flows do start, whether they be from the collapse of the the eruptive column or from the vents themselves, the town will be…
eklemetti | May 10, 2008
Etna, one of Italy's (and the world's) most active volcanoes, has started erupting again. Saturday night the volcano erupted lava flows, although that is pretty much all the details in the article. The last series of major eruptions at Etna were last fall, but the volcano never tends to stay quiet for long. For those of you who want to take a peak, Etna has a nice live webcam.
eklemetti | May 9, 2008
This marks a full week of eruption at Chaiten and the volcano shows no signs of abating.
You have to feel for Luis Lara. He is apparently the pointman for the SERNAGEOMIN in regards to this eruption and really, I think its anybody's guess what might happen next. Heck, we haven't seen many eruptions of this scale - and this out-of-the-blue - since the birth of modern volcanology, so we're testing a lot of hypotheses now. What Dr. Lara says is that the eruption is still going strong, lava flows seem to be occurring at/near the vent but not spilling out of the caldera, the two vents have…
eklemetti | May 8, 2008
Another day, another development at Chaiten. Military stationed near the volcano helping with evacuations reported "booming noises" and saw incandescent blocks getting hurled from the vent area. This suggests that lava is at the surface and potentially that the edifice itself is beginning to crack/strain from the loss of material from the eruption. Remember, when you erupt all this volcanic material, you leave a void under the volcano where that magma used to be, so suddenly you have a volcano with no foundation. Sometimes they can founder into that space, forming a caldera. We already…
eklemetti | May 3, 2008
Ruapehu, in New Zealand, is starting to show signs it may erupt in the near future. It is a fairly active volcano, last erupting in Septemeber of 2007, but it is also a rather hazardous volcano thanks to the crater lake at the top that could be breached. Combined with the development on the volcano, it is a potent mix.
Now, why would you ever think to develop on an active volcano? Well, good question! There are ski areas on Ruapehu that are built on some of the lahar (volcanic mudflow) deposits on the side of the volcano and some of these lahars are not that old at all, so the likelihood…
eklemetti | May 3, 2008
So, this isn't exactly about current eruptions, but I was able to watch the new (well, to the U.S.) Doctor Who episode centered around the 79 A.D. eruption of Mt. Vesuvius. Now, to me, this was two of my favorite things (volcanoes and Doctor Who) fuses into one, and while I enjoyed it, it wasn't my favorite thing ever.
SPOILERS AHEAD!
The premise is that the Doctor and Donna accidently end up in Pompeii the day before the volcano erupts and buries the city in pyroclastic flows and ash fall. Of course, there is more than that going on. We find all sorts of nasty alien-related things going on…