Re: POSSIBLE ERUPTION OF BARDARBUNGA VOLCANO ON ICELAND. QUAKE SWARM, HARMONIC TREMOR DETECTED!!! YELLOW AVIATION WARNING NOW!!! The Bárdarbunga volcanic system is the largest in Iceland and it has erupted more lava than any other volcano on the planet in the last 10 000 years. The volcanic system is 200 kilometers long and 25 kilometers wide. The central volcano has a seventy square kilometer caldera that is ten kilometers across. Technically it is a highly complex type of volcano that is a mixture between a shield volcano, a strato volcano, tuya formations, volcanic ridges, radial volcanic fissures and a truly astounding volcanic fissure swarm extending in a NNE/SSW direction out from the central volcano. The largest effusive eruptions has come from the fissure swarm where the Thjorsahraun is the largest lava eruption on the planet in the last 10 000 years. The largest explosive eruption occurred in 1477 during the Veidivötn basalt flood eruption in the southern part of the fissure swarm. During that eruption a VEI-6 explosive eruption occurred in the caldera that was the largest explosive eruption in Iceland since Grimsvötn suffered another VEI-6 almost 10 000 years ago. The 1477 eruption is the largest explosive eruption in Iceland since settlement and also the second largest effusive eruption only bested by the Lakí eruption. I think I just set a new record in using the word “largest” in a single paragraph. Bárdarbunga is understudied since very little was known about the volcano until satellite imagery revealed the true scale. The reason behind this is a combination between it being remote, it having had small and benign eruptions for the last 537 years. The small scale of the eruptions are probably due to damages to the volcanic chamber system in the caldera after the large explosive eruption in 1477. The last reason is that the entire volcano is covered in ice completely. The last confirmed eruption in Bárdarbunga occurred in 1996 during the Gjálp eruption. That eruption was a short duration VEI-2 eruption with a 3.5km high eruption column. It is also possible that the entire Gjálp eruption was a radial fissure eruption from Bárdarbunga and that Grimsvötn erroneously had that eruption attributed to it. The jury is out on that one. Bárdarbunga is also by far the most seismically active of the volcanoes on Iceland. Not in numbers, that is the Gódabunga Cryptodome near Katla Volcano, but in the amount of Cumulative Seismic Release. CSR is the same as the amount of earthquake energy released over time. ... [link to volcanocafe.wordpress]
Posted on: Sat, 16 Aug 2014 19:47:04 +0000
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