At 01:27 UTC on 24-August-2019 an magnitude 3,4 earthquake took place in Krýsuvík volcano. This earthquake was felt in Hafnafjörður, Garðabæ and Kópavogi. This earthquake started a minor earthquake swarm in Krýsuvík volcano.
Earthquake swarm in Krýsuvík volcano. Copyright of this image belongs to Icelandic Met Office.
This earthquake swarm seems to be over when this article is written. Earthquake swarms like this are regular at this location.