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Post by icefisher on Sept 3, 2014 16:03:32 GMT
Heck! In this forum itself, GLC (a one time poster) blamed the Dalton Minimum low temperatures bottoming in 1813 on an Iceland volcanic eruption that occurred in 1815. Should be a piece of cake blaming the pause on this. |
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Post by hrizzo on Sept 3, 2014 16:55:33 GMT
¿An eruption of liquefied thiotimoline?
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Post by sigurdur on Sept 9, 2014 14:14:11 GMT
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Post by dontgetoutmuch on Sept 10, 2014 15:05:02 GMT
It looks like a lot of the magma filling the chamber under the volcano has left the building without causing a major eruption. This is proved by the subsiding caldera. This in isolation would be sort of a positive outcome in my opinion. On the other hand the seismic activity is still through the roof!!! Why, if the pressure in the magma chamber is decreasing, as evidenced by the deflation at the surface, is seismic activity still so high? One wonders if there is an area nearby that is now the recipient of all that magma? I hope it stays underground. Barring that, I hope that the relatively minor fissure eruption is all that we see on the surface. In the meantime, I would look for an area nearby that is experiencing rapid inflation. news.yahoo.com/sinking-iceland-volcano-crater-raises-flood-worries-143811202.html |
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Post by douglavers on Sept 13, 2014 3:44:38 GMT
baering.github.io/en.vedur.is/earthquakes-and-volcanism/earthquakes/vatnajokull/www.ruv.is/frett/subsidence-by-hundreds-of-meters-possibleFrom the RUV article: [The caldera in Bardarbunga volcano could subside by hundreds of meters, say two of Iceland´s top geophysicists. The caldera has in recent days sunk by at least 20 meters, increasing the likelihood of an eruption there. In a short article published yesterday, geophysicists Magnus Tumi Gudmundsson and Pall Einarsson at the University of Iceland´s Institute of Earth Sciences state that the subsidence in Bardarbunga makes it even harder to predict future development of events in north-western Vatnajokull glacier. A magma intrusion has migrated some 40 kilometers from beneath Bardarbunga, to the north, leading to a lava eruption north of the glacier's margin, in the lava field of Holuhraun. The current subsidence in Bardarbunga it to date the largest such event observed in Iceland. The last known example of a caldera collapse happened in the Askja volcano system in 1875, when a large explosive eruption occurred there, causing widespread ashfall in the eastern part of Iceland and reached Scandinavia. That caldera collapse created a lake in Askja, the deepest lake in Iceland. However, Gudmundsson and Einarsson note that such events are well know internationally. For instance the caldera in Piton de la Fournaise volcano on Reunion Island in the Indian Ocean subsided by 340 meters in 10 days in 2007, when a large eruption occured just outside the caldera itself. Other recent examples are the Fernandina caldera on the Galapagos Islands and Tolbachik on the Kamchatka peninsula. ] I think this is all geologically fascinating. The idea of a caldera of about 70 sq kms sinking by about 1 metre per day is scary. Presumably the lava is venting out of the existing fissure eruption. Some of the earthquakes shown in the “blob” map above are very close to the surface. If I recall correctly, Krakatoa blew up when an earthquake crack allowed a vast volume of seawater to land on a large magma chamber. I fervently hope that 6oo metres of icecap does not behave in the same way.
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Post by nautonnier on Sept 13, 2014 15:34:21 GMT
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Post by cuttydyer on Sept 14, 2014 6:55:06 GMT
A little cheery viewing for a Sunday morning (peace was shattered one Sunday morning in 1783): A little background on the Laki fissures: The fissures opened up on each side, erupting over an eight-month period between 1783 and 1784. The eruption poured out an estimated 3.4 cubic miles (14 km3) of lava and clouds of poisonous hydrofluoric acid and sulfur dioxide compounds that killed more than 50% of Iceland’s livestock, and lead to a famine that killed approximately 25% of the island’s human population. Sulfur dioxide spewed into the Northern Hemisphere, causing a drop in global temperatures and the coldest winter in 250 years.. This caused crop failures in Europe and may even have caused droughts in India. The eruption has been estimated to have killed more than six million people globally, making it the deadliest eruption in historical times. It was the second greatest eruption of the last 1,000 years, behind only the 1815 eruption of Mount Tambora in Indonesia, says Stephen Self, visiting professor of volcanology at the Open University. Consequences in Europe The estimated 120,000,000 tons – 120 million tons! – of sulphur dioxide is about three times the total annual European industrial output in 2006, and equivalent to a 1991 Mount Pinatubo eruption every three days. While the Pinatubo eruption produced 17 tons of sulphur dioxide, Laki pumped out the same amount every three days at its peak, says Self. It belched more toxic gases than any eruption in the last 150 years. A thick haze – known as the “Laki haze” – spread down through Norway, Germany, France and across to Britain, causing panic when farm laborers began dropping like flies. (The sulphur dioxide was mixing with water vapor in the lungs to choke victims.) More than 20,000 deaths are estimated in Britain alone during the summer of 1783. Laki contributed significantly to several years of extreme weather in Europe, leading to an increase in poverty and famine that may have contributed to the French Revolution in 1789. Studies also suggest that there was an unusually strong El Niño effect from 1789 to 1793. Consequences in North America In North America, the winter of 1784 was the longest and one of the coldest ever recorded. It brought the longest period of below-zero temperatures in New England, the largest accumulation of snow in New Jersey, and the longest freezing over of the Chesapeake Bay, where Annapolis, Maryland is located A huge snowstorm hit the south, the Mississippi River froze at New Orleans and there was ice in the Gulf of Mexico. en.wikipedia.org/w/index.php?title=Lakinews.bbc.co.uk/1/hi/8624791.stm |
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Post by sigurdur on Sept 14, 2014 16:51:42 GMT
I had to make a fast run to South Dakota to pick up a tractor. As I was driving, I commented to my wife. Think about this. See where that truck is about 2 miles down the road? Most of the activity in our atmosphere occurs in the 1st 10,000 ft. One thinks 2 miles is pretty high, but when viewed straight ahead, it is a pretty small distance.
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Post by sigurdur on Sept 14, 2014 23:12:16 GMT
New Tractor? What'd ya buy? Bought an old tractor. Have a 966 that either the torque, clutch, or input shaft died on. Is on the bean cutter. So, found a 986 IHC which is the same tractor, just a better cab. That way the bean cutter parts will unbolt of my 966 and bolt on to the 986 quickly and I will be cutting tomorrow again. Don't have time to wait a week to fix the 966, will push it into the shop this winter and do what is required. Then sell it as I don't need two of similar sized tractors. |
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Post by douglavers on Sept 15, 2014 4:52:13 GMT
baering.github.io/Quite large earthquakes quite near the surface, perhaps suggesting imminent caldera collapse. This is a caldera covering 70 sq kms. I think Bardurbunga is going to KABOOM! quite soon. One can but hope for a relatively small eruption. A large eruption at this time of year, with ash and sulphur dioxide in the stratosphere, would accelerate autumn cooling in the Northern Hemisphere.
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Post by Ratty on Sept 15, 2014 10:29:19 GMT
Hope you're back in Oz Doug ......
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Post by dontgetoutmuch on Sept 15, 2014 12:28:58 GMT
baering.github.io/Quite large earthquakes quite near the surface, perhaps suggesting imminent caldera collapse. This is a caldera covering 70 sq kms. I think Bardurbunga is going to KABOOM! quite soon. One can but hope for a relatively small eruption. A large eruption at this time of year, with ash and sulphur dioxide in the stratosphere, would accelerate autumn cooling in the Northern Hemisphere. I hope it does not go boom. IMO we are looking at significant global cooling WITHOUT a major eruption. The seismograph recorded a 5.4 at a depth of 100 meters this morning. This was in the same area as all of the other large recent quakes... under a significant amount of ice. Webcam 2 shows significant activity, but it does not look subglacial to me at this time. |
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Post by cuttydyer on Sept 15, 2014 17:40:19 GMT
Great satellite image:  |
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Post by dontgetoutmuch on Sept 16, 2014 19:47:48 GMT
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Post by dontgetoutmuch on Sept 17, 2014 17:54:45 GMT
Looks like some of the folks keeping an eye on the volcano are having that sinking feeling... www.jonfr.com/volcano |
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