The Icelandic volcano known as Hengill did have a minor earthquake swarm of 20 something earthquakes today. This earthquake swarm might be related to geothermal power plant activity nearby (by pumping down or up water in the area). But at the moment I do not have it confirmed and this has also not been confirmed by the news.
This earthquake swarm in this area is normal and this volcano has several every year as it located on the main rift zone in Iceland. The last large earthquake swarm in this volcano took place during the year 1997 to 2000. Then many earthquake up to size Mb5.0 took place in Hengill volcano.
Icelandic news. Use Google translate at own risk.
Um 20 skjálftar hafa mælst (Vísir.is)