Today (18-January-2020) at 12:38 UTC an earthquake swarm took place on the Reykjanes ridge close to Eldeyjarboða island. Largest earthquake in this swarm had a magnitude of Mw4,0 according to Icelandic Met Office. Both USGS and EMSC are reporting this earthquake as a mb4,5 in automatic detection. Second largest earthquake had a magnitude of Mw3,8.
Earthquake swarm on the Reykjanes ridge not far from Eldeyjarboða island. Copyright of this image belongs to Icelandic Met Office.
Other earthquakes have been smaller in magnitude. This earthquake swarm appears to be over but it is possible that this is just a limited stop in earthquake activity before it starts again. That is a common feature of earthquake swarms in this area. Earthquake can reach magnitude of Mw5,5 in this area of Reykjanes ridge.
Update on 19-January-2020
Icelandic Met Office updated the earthquake magnitudes yesterday and it now shows two Mw4,5 earthquakes taken place at 14:07 UTC and 14:17 UTC and one Mw4,0 earthquake having taken place at 15:52 UTC.
Updated earthquake map of the earthquake swarm on the Reykjanes ridge on 18-January-2020. Copyright of this image belongs to Icelandic Met Office.
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Highest conductivity in a while in Múlakvisl. It peaked at 434,8 microsiemens/cm. The water level has risen only a bit. Godabunga drumplot shows a few minor spikes, could they be related to the geothermal water coming out?
This might because of heavy rain in south Iceland for the last 24 hours. There’s a warm low pressure system passing over Iceland today (21-January-2020). It should clear up in few hours.
The rain might have moved a lot of older volcano ash material. It is a possibility that a cauldron emptied it self but I have not seen any announcement about it yet.