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World Volcano Activity UPDATE !!! MARAPI AGAIN!!! KATLA AGAIN!!! SWARM STARTING IN ICELAND DORMANT VOLCANO Bláfjoll!!!
Ms Sans Serif
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[quote:Luisport:MV8xNzU0NjcwXzMzMTUwMDg0XzdFNDIxOTM1] Three Rumbling Volcanoes: Little Sitkin, Reclus and Tangkubanparahu. This week has seen three lesser-known volcanoes move to a higher alert status after increasing restlessness. Little Sitkin This morning, the Alaska Volcano Observatory moved Little Sitkin to Yellow Alert status after a sharp increase in seismicity started yesterday and continued through the night. To their knowledge, nothing has occurred at Little Sitkin beyond this increase in earthquakes, but apparently this activity was enough for them to raise the alert. Like many Alaska volcanoes, Little Sitkin is a stratovolcano sitting within an older caldera system that has not erupted in over 180 years, although fumarolic activity is common in the caldera and on Little Sitkin itself. The volcano is remote – way out in the Aleutian Islands – so the main hazard is to the air traffic that passes over the island chain. Reclus Eruptions reader GuillermoChile has done an excellent job of keeping us informed of the rumbling noticed at Reclus in Chile. The volcano is in southern Chile, between Aguilera and Monte Burney in Patagonia and it quite a fascinating feature. It is the likely source of a number of ash layers found across Patagonia, so significant explosive eruptions have come from the Reclus, however the volcano was only recognized as such in 1987. The volcano has been identified as the source of at least 3 historical eruptions, all fairly small at VEI 1-2. Over the summer, earthquakes began to be felt in towns in the region of the volcano (causing quite an increase in anxiety over the source) and a potential for new activity from the Reclus has prompted geologists to visit the volcano later this spring (southern hemisphere). Interestingly, one article mentions that an overflight of the volcano in 2008 spotted cracks on the glaciers that cover the volcano along with traces of ash. However, the direct connection between the seismicity in Patagonia and Reclus is still tenuous, so further observations of the remote volcano will need to be done. http://www.wired.com/wiredscience/2012/08/three-volcanoes-placed-on-heightened-alert-little-sitkin-reclus-and-tangkubanparahu/ [/quote]
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