Thursday, March 1, 2012

2.0 Magnitude Quake Strikes Eyjafjallajökull

A Magnitude 2.0 quake struck the Eastern flank of Eyjafjallajökull today, near the same spot of the initial fissure eruption at Fimmvörðuháls. There could be many explanations for this quake, such as structural settling of the post-eruption fissure region, or resumed intrusion of magma into the Eyjafjallajökull-Katla transform region. It is simply too early to tell as this quake pretty much happened within the last hour, so this will be a short post until/if anything further occurs in the region.

There were also two >1.0 mag quakes within the Katla caldera.

Other areas of Iceland experiencing heightened seismicity include the Reykjanes peninsula near the Brennisteinsfjöll volcanic field where more than 27 quakes, two above magnitude 3.5, have struck within the last 24 hours. An area to the East, near Hengill volcano is experiencing continued seismicity due to geothermal exploration and power generation (Iceland is the worlds biggest user of geothermal energy). The quake swarm at Brennisteinsfjöll is strong, and is probably related to magma dike intrusion, however the area has not seen any eruptions since the 14th century, so it is difficult to say what's happening here. Harmonic tremor is being detected at this location, so the quakes are most likely volcanic in nature.

Tremors at Reykjanes peninsula within the last 48 hours.

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