The earthquake swarm which started in December 2019 is continuing, let’s have a quick update on the stats.
There have been 19,675 earthquakes in the Reykjanes Peninsula area 64.4°N, 23.0°W to 63.7°N, 21.0°W for the period 1 Jan 2016 to 14 June 2020, of which 14,258 (72%) have occurred in the last six months, most associated with the swarm near Svartsengi.
Our updated scatter plots show that there is more shallow small earthquake activity above the lithosphere than in our earlier plots.
The geodensity plots for months 48 (December 2019) onwards (Figs 3.1 and 3.2) show that the most intense action started to the east of Mt Thorbjörn and has migrated west to Svartsengi and beyond.
IMO has confirmed that uplift has resumed in the vicinity of Mount Þorbjörn. Ground deformation is clearly visible on the GPS plots.
We are still looking at an unusually large swarm, accompanied by continued uplift in the vicinity of Mt Þorbjörn.
At the time of writing, there has been no change in the uncertainty phase declared by Icelandic Civil Protection .
The Armchair Volcanologist
15 June 2020
Raw earthquake data and GPS plots downloaded from the Icelandic Met Office: https://en.vedur.is
Earthquake plots are the author’s own work.
© Copyright remains with the author; all rights reserved, 2020