Record Smashing 20000 Earthquakes In Past Month In Iceland According To Iceland National Broadcasting Service
Record Smashing 20000 Earthquakes In Past Month In Iceland According To Iceland National Broadcasting Service
20,000 earthquakes in one month
Tuesday marks one month since a record wave of seismic activity started at and around the volcano of Bardarbunga. At least 20,000 earthquakes struck the area in that period, according to estimates from the Icelandic Met Office.
186 earthquakes of magnitude 3.0-3.9 were detected. 43 quakes were of magnitude 4.0-4.9, most of them at Bardarbunga’s caldera. A total of 23 earthquakes were detected of magnitude 5.0 or greater, all at Bardarbunga. The largest earthquake, a magnitude 5.7, struck on 26 August. That’s the largest earthquake in Iceland since a M6.3 struck east of Reykjavík in 2008.
No significant changes have been observed in the ongoing lava eruption at the lava field of Holuhraun, north of Bardarbunga volcano. Sulfur dioxide pollution from the eruption continues to plague people in the northern and eastern parts of Iceland, though it causes no immediate harm to people.
A M5.2 earthquake struck Bardarbunga Tuesday afternoon. The subglacial volcano’s caldera continues to subside at a rate of 50 cm (20 inches) a day, according to scientists.
Three scenarios of future development are still considered most likely. Firstly, that the subsidence of Bardarbunga’s caldera will stop and the Holuhraun eruption slowly fades out.
Secondly, the subsidence could continue, along with the eruption in Holuhraun. Another eruption could start, possibly under glacier. In this scenario, the eruption(s) could last for a longer time, with lava volume possibly measured in cubic kilometres. Should a subglacial eruption occur, explosive action and glacial floods should be expected.
The third scenario is an eruption within the Bardarbunga caldera. Scientists say such an eruption could melt large volumes of ice, causing a powerful glacial flood. Another possibility is that the water would not immediately escape the caldera, because of the volcano’s previous subsidence. That meltwater would later produce a large flood. When the eruption would reach through the glacial ice above, explosive eruption with ashfall would be expected.
This story, by the Icelandic National Broadcasting Service (RUV), was updated on 16 September 2014, at 20:10 GMT.
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