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Iceland Mag

Geology

Sharp earthquake swarm in Bárðarbunga: 4.0 magnitude quake yesterday afternoon

By Staff

  • Location of Bárðarbunga One of several major volcanoes in Vatnajökull glacier. Last eruption in the Bárðarbunga system came up in Holuhraun lava field. Photo/Garðar

A brief but sharp earthquake swarm was detected in the Bárðarbunga caldera late yesterday, Thursday afternoon. The relatively short swarm, which counted just a handful of quakes, included two relatively powerful 3.7 and 4.0 magnitude quakes. The epicenter of both tremors was at the surface in the south-east part of the volcano's main caldera. The last significant tremors were detected in the monster volcano at the end of April.

Read more:  Quick primer on Bárðarbunga, Iceland's most powerful volcano

The seismic monitoring system of the the Icelandic Meteorological Office detected a 3.7 magnitude quake at 15:56, 4.7 km (2.9 mi) east-southeast of the center of the caldera at the surface - a depth of 0 m. A second 4 magnitude quake was detected just four minutes later at 16:00, 6.4 km (4 mi) east-southeast of the center of the caldera at a depth of 100 m (330 ft), followed by a third smaller 1.9 magnitude quake in the same region.

Read more: Why the constant earthquakes? Iceland is slowly being torn apart 

The Bárðarbunga system has been showing increasing levels of activity for the past year or so, following the 2014-15 Holuhraun eruption at the northern edge of the system.

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