Jökull

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Jökull - 01.01.2019, Qupperneq 60

Jökull - 01.01.2019, Qupperneq 60
The 2011 unrest at Katla volcano Figure 4. Magnitude-time evolution of the seismicity at Goðabunga (left) and inside the caldera (right) during 1998–2015, from IMO catalogue (events with magnitude ML>1). – Stærð teiknuð sem fall af tíma fyrir skjálfta í Goðabungu-þyrpingunni (vinstri) og fyrir skjálfta innan öskjunnar (hægri) á tímabilinu 1998–2015. Skjálftar með ML > 1. Gögn frá Veðurstofu Íslands. ter described by Soosalu et al. (2006) and Jónsdóttir et al. (2009) still occurs, but has gradually become less clear. In addition, this peak seems to have shifted to an earlier time of the year, probably reflecting climate and weather changes. – The seasonal correlation of the caldera seismicity is less pronounced than at Goðabunga (as was al- ready observed in previous studies), but, opposite to Goðabunga, it has become clearer in the past few years, especially in 2012, 2013 and 2014. – A sharp increase of the seismicity rate inside the caldera occurred in July 2011, coinciding with the un- rest episode and jökulhlaup, and continued until the beginning of 2012 with 660 events with ML>1 and 20 with ML>2.5. – The Gvendarfell seismic cluster on the southern flank became active in July 2011. It includes nearly all events located on the southern flank of Katla (Fig- ure 3), with the spread of the hypocenters due to loca- tion uncertainty. The size of the cluster is in fact very JÖKULL No. 69, 2019 59
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