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Originally posted by ni91ck
I think there are some tremor-graphics here that shoot a little up, but witch one i have to look???
And here there are some squares that don't work??? Why is that?
And the squares seem to be only down in the English version which is odd, but they are working in the Icelandic version.
The scene of Germany’s famous Laacher See lake looks picturesque and serene but underneath the calm surface of the waters lies a potential killer that could devastate a good portion of Europe. The last time the Laacher See super-volcano erupted 12,000 years ago, it deposited ash across much of Europe. On July 30, 2010, a 5.6 earthquake struck the region and that likely signaled an awakening of the giant sleeping caldera. That Laacher See is a potentially active volcano has been proven by seismic activities and heavy thermal anomalies under the lake. Carbon dioxide gas from magma still bubbles up at the southeastern shore, and scientists believe that a new eruption could happen at any time. Today the region near Koblenz was shaken by a swarm of 7 earthquakes beginning with a 4.5 magnitude quake which erupted at a depth of 6 km.
The caldera was formed after the colossal Laacher See eruption dated to 12,900 years ago. The remaining crust collapsed into the empty magma chamber below, probably two or three days after the eruption. An estimated 6 km³ of magma was erupted, producing around 16 km³ of tephra. This massive eruption thus had a Volcanic Explosivity Index (VEI) of 6, and was larger than the colossal 1991 eruption of Mount Pinatubo (Philippines) which also had a VEI of 6 (10 km³ of tephra erupted).
The lava lake at Kilauea’s Halemaumau crater has been rising gradually in the last few months. Volcanologists don’t know what the significance of the rise is. It’s possible that the lava could spill out of the pit and on to the crater floor, though this might take months to happen. The Hawaii Tribune-Herald reported the observatory’s seismologists are also watching an increased number of earthquakes in the upper east rift zone. Hawaiian Volcanoes Observatory scientist-in-charge Jim Kauahikaua says the increase in seismicity somewhat resembled the prelude to a brief June 2007 eruption in a remote section of Hawaii Volcanoes National Park.
Originally posted by Nidwin
May be I can post the following link here too.
It's a study made, couple of years ago, of the Eifel Hotspot.
Quite technical but a lot of interresting information can be found in this paper.
Also the Laacher See "belongs" to that hotspot
Receiver functions also provide evidence for a low velocity body with 1 per cent partial melt 60–90 km beneath the Eifel (Budweg 2003).
Because the permanent stations surround the Eifel region, and because we lack sufficient Eifel data to test more complex models, we extrapolate this single-layer model approach to the treatment of splitting across the Eifel Network.
Many of the phases we analysed did not demonstrate reliable apparent splitting, and yielded unconstrained measurements.
The Eifel PAF model predicts 61 per cent of the φ variation from a single-azimuth model (Figs 9 and 10). The Eifel stations that show rapid splitting variations could be considered as outliers, and part of the source of the 39 per cent misfit.
Although our PAF model explains the majority of our splitting data, and is consistent with many other geological and geophysical data, there are issues that need to be addressed if a fixed upwelling exists beneath the Eifel hotspot, the most obvious being the lack of an observed hotspot track with an age progression, which would be
expected for a moving plate.
The ∼300-m Rhenish Massif topographic swell and the tomographic anomalies suggest that the Eifel upwelling is quite slow, and has a low excess temperature, which explains the absence of major volcanism associated with the hotspot.