Over the past few months, seismic activity at Bárðarbunga Volcano (in Central Iceland) has been increasing, mainly under the volcano’s large, ice-covered caldera.
Since the beginning of the year, more than 300 shallow earthquakes of magnitudes up to 3.8 on the Richter scale were recorded near the southern and northeastern caldera rim.
The volcano continues to inflate at the depth of 15 – 10 km, says Jón Frímann website. Earthquake activity continues to increase, with regular earthquake swarms with magnitude of 3,0 – 3,5.
This suggests magma might be filling the volcano’s reservoir underneath the caldera.
Thanks to William Dugan for this info