eklemetti | June 19, 2008
Just when you thought it was safe to go outside.
After apparently settling down a bit over the weekend, Chaiten has kicked it back up a notch. The latest reports say that two ash columns are active ... and that is about all we get for more news. Not surprisingly, most of the damage around the volcano has been done by flooding and/or lahars, thanks to the ash and debris-choked rivers like Rio Blanco. It also sounds like the SERNAGEOMIN is digging in for the long-haul, calling for the eruption to go on - to some degree - for months. This isn't too shocking considering the minor dome eruption…
eklemetti | June 17, 2008
Over the weekend, Mt. Etna (Italy) had some spectacular Strombolian fire-fountaining. Lucky for us, Marco Fulle and a group went up to the summit on Friday (the 13th) and got some great pictures of the current (ongoing) eruption which have been posted on Stromboli Online. Sounds like the eruption has been increasing in the past week, so it could be a busy summer in the Aeolian Island of Italy.
eklemetti | June 16, 2008
I am always amazed by the number of volcanoes that show signs of activity every year that I have never heard of before. Case in point is this report of activity near Mr. Kurikoma, on the island of Honshu in Japan. The last known eruptions at Kurikoma were back in 1950, and they seem to be water-magma interactions that produce phreatic explosions - and even beyond this 1950 eruption, there isn't much information about the eruptive history at Kurikoma.
However, if you look at the report, the activity is actually rather far from the summit of Kurikoma - a full 7 km to the southwest. There are…
eklemetti | June 16, 2008
The newest reports out of Chile are indicating that the eruption at Chaiten has reached levels of intensity not seen since the eruption first started over six weeks ago. I have to admit, that isn't a good sign in terms of keeping the volcanic edifice in one piece. There have been frequent, small (<M3) earthquakes along with "rumbling noises," which might indicates that the domes are collapsing to form pyroclastic flows. Alternately (and need I remind you, very speculatively) it might be the the edifice itself beginning to show the wear of this long eruption and the emptying of the magma…
eklemetti | June 14, 2008
Just a quick update for today (busy watching Red Sox vs. Reds, sorry, that is my other love: baseball). New reports concerning White Island suggest that an eruption is not imminent. Although there have been earthquakes nearby, whether or not they could directly lead to an eruption is unclear, but it sounds like geologists in New Zealand on trying to be cautious. This is the fun/challenge of predicting and monitoring volcanoes - the signs might be there, but you never know if the signs are all leading the same way.
eklemetti | June 13, 2008
So, this was a bit of a surprise to me. Six weeks into the Chaiten eruption in Chile, apparently the volcano has picked up the tempo again. Not much in the report except that apparently two new vents/craters have opened, there is an increase in ash emission and seismic activity. What this might be is difficult to ascertain from the report, but it could indicate that the volcano might be heading down the road toward a collapse, such as the one previously alluded to by scientist-in-charge Luis Lara. Another report - albeit almost identical to the first - does mention in the headline that the…
eklemetti | June 13, 2008
Authorities in New Zealand have issued an alert for White Island. After a fairly sizable earthquake (M=5.4) near the island, the state agency that oversees volcanoes (GNS Science) is warning people to stay away from White Island for the next 48-72 hours on fears it might erupt. Normally, just because there is an earthquake near a volcano you don't instantly jump to the idea that it will erupt, but the 5.4 and subsequent earthquakes have been both near White Island and shallow (5-km depth), indicating it could very well be related to magma moving under the system.Â
White Island itself is a…
eklemetti | June 12, 2008
Most people don't realize that a majority of the earth's volcanoes are underwater. That is to say, the mid-ocean ridge system that runs along the bottom of all the major oceans can be considered one big volcano. However, thanks to its location deep underwater, we have only had second- or third-hand evidence of eruptions at mid-ocean ridges or seamounts.
Not any longer according to my graduate alma mater, Oregon State University. An active eruption was captured at Brimstone Pit in 2006, near Guam, by a team looking for hydrothermal activity at the sea's bottom. The eruption appears to be a…
eklemetti | June 10, 2008
One of the most famous eruptions in human history (at least recent history) is the 1883 eruption of Krakatau in Indonesia, made (more) famous by Simon Winchester's book (and the inappropriately named film Krakatoa: East of Java ... hint: look at a map). Since the cataclysm eruption, a new volcano has risen where the old one once stood. Anak Krakatau (I believe loosely translates to "son of Krakatau") is a fairly active volcano, producing Strombolian explosive eruptions - fairly mild - that threw volcanic bombs and debris onto the island and into the surrounding ocean (thus, building up the…
eklemetti | June 9, 2008
Today, I saw a report that a dome on Arenal in Costa Rica had collapsed last Friday (report in Spanish, but good picture of the event), producing a block & ash flow that left a 800-meter scar on the volcano's flank. No one was injured during the avalanche, but tourists were evacuated as a precaution. There have been minor rock fall related to the andesite lava that has been erupting over the last year, but apparently this is the first major avalanche.
This shows the fine line between an effusive (lava flow dominated) eruption and explosive (pyroclastic dominated) eruption. Although this…
eklemetti | June 8, 2008
I mention this little human interest piece mostly because I am especially found of Mt. Tarawera (note: this link goes to the GVP page for Okataina, the volcanic cluster of which Tarawera is a member)Â in New Zealand. This Tuesday (June 10) is the 122nd anniversary of its most recent eruption, the 1886 eruption that erupted the Rotomahana Basalt. The eruption itself was relatively unique as it was a basaltic eruption that was almost entirely dominated by explosive eruptions of basaltic tephra (see illustration above). This likely means that the basalt was highly enriched in volatiles gases…
eklemetti | June 6, 2008
I had been looking for some pictures of the recent eruption of Cerro Azul in the Galapagos, and finally I found some posted on the BBC. There are some rather stunning pictures of the rift eruption (#3), the lava flows heading downslope (over older lava flows, #4) and even a little lava spatter (#1).Â
eklemetti | June 6, 2008
Reuters has a short video showing some of the damage inflicted on Chaiten by the volcano of the same name. Looks like the ash, lahars and flooding have wiped out at least a third of the town (according to the voice-over) ... and in a sense, Chaiten (the town) lucked out as the destruction could have been a lot worse.
eklemetti | June 6, 2008
A few reports this morning that Mt. Soputan, on the island of Sulawesi in Indonesia, is currently erupting. The reports indicate that there has been a lot of seismic activity and some ash emitted from the volcano. As with many volcanoes in the densely populated nation of Indonesia, there are people living on the slopes of Mt. Soputan and the authorities are preparing to evacuate them, if necessary. The last eruption at Soputan was way back in ... 2007 (see photo above), so it seems like the volcano is another one of many active Indonesian volcanoes.
eklemetti | June 4, 2008
If you needed any evidence that Chaiten is still erupting quite vigorously, just check out the MODIS image taken on 5/31 (above). The eruptive column is still delivering ash across southern Chile, over the Andes and into Argentina. This eruption just keeps on impressing me with its duration and magnitude - this is one for the ages (well, human ages).
eklemetti | June 3, 2008
The latest reports from Cerro Azul in the Galapagos indicate that the current eruption that started last week is over. The volcano erupted from Thursday to Sunday and produced lava flows that travelled 10 km from the vent, but little damage was reported. It is hard to tell from the report if this is the believed to represent all the activity to be expected at Cerro Azul, but more likely than not we'll see more eruptions if this is a new stage of activity at the volcano (in spanish).
eklemetti | June 3, 2008
I've been trying to find information to post this week, but not much out their in the press this week.
I did like this article on the close relationship between Salvadoran coffee growers and Santa Ana/Ilamatepec Volcano. After being pressed into an emergency lecture yesterday here about the interactions between humans and volcanoes, this is case in point that a mere 3 years after an eruption helped wipe out their crops, coffee growers are back to planting near Santa Ana's crater. It is hard not to when the soils near the volcano are so fertile. You can see in the picture (above) how lush the…
eklemetti | May 30, 2008
I always find it interesting how and why news of a volcanic eruption makes it into the press. Sometimes it is just to report the eruption itself, however, a lot of the time it is more to report the "human interest" side of the story, or in this case, the wildlife side of the story. Cerro Azul, one of the volcanoes in the Galapagos islands, apparently erupted on Thursday (5/29). Lavas flows on the northeast side of the volcano are threatening the Giant Galapagos Tortoises and their status (the tortoises and the lava flows) will be monitored.
On the volcanic side of things, Cerro Azul last…
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 29, 2008I only post this because this is the sort of meaningless, unintelligible science journalism that drives me nuts. It doesn't really elucidate anything to the general public and it offers no details for the experts. I don't even know exactly what the findings were, because based on the article, this is nothing new. This is what happens when science education goes downhill I suppose.
EDIT 5/30/08: Looks like someone decided to do a little more indepth article on the research. This is a much better take on it.