The situation around a volcano in Iceland has become calmer after another eruption north of the coastal town of Grindavík. The strength of the eruption has decreased significantly, the Icelandic broadcaster RUV reported on Thursday. No more explosive events were observed and there was only very low seismic activity. All defences held overnight, it added. A powerful volcanic eruption occurred on the island on Wednesday, the fifth since December. After numerous earthquakes had shaken the area and there was already enormous pressure underground, an eruption occurred in the afternoon near Sundhnúk…