Around 4,000 individuals were cleared last month from Grindavik, a fishing town around 4km (2.5 miles) away.
The emission began north of the town at 22:17 nearby time (22:17 GMT) on Monday, the Icelandic Met Office said.
An inhabitant living close to Grindavik portrayed "insane" and "terrifying" scenes that evening, and said she may as yet see the fountain of liquid magma detonating on Tuesday.
Iceland has been prepared for volcanic movement for a really long time. Since late October, the locale around the capital Reykjavik has been encountering an expansion in quake action.
The emission should be visible from Reykjavik, which is around 42 km north-east of Grindavik.
An onlooker in the capital let the BBC know that portion of the sky toward the town was "illuminated in red" from the emission, and smoke should have been visible surging out of sight.
Specialists say they don't anticipate that the emission should bring the very level of disturbance as one that occurred somewhere else in Iceland in 2010, which stopped European air travel.
The Icelandic Met Office said at 12:30 GMT on Tuesday that the force of the ejection was diminishing, yet that gases from the spring of gushing lava may as yet be felt in Reykjavik on Tuesday night or Wednesday morning.
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Aoalheiour Halldorsdottir, who lives in Sandgeroi - around 20km from Grindavik - said she had seen the emission from her home.
"Seeing it with my own eyes was insane. We have had fountain of liquid magma blasts previously, however this was whenever I first got truly frightened," she told BBC News.
"We're utilized to volcanoes [erupting], yet this was insane."
She said there was some "alarm" on Monday night, and that she had purchased additional provisions of water, yet that things had generally gotten back to business as usual on Tuesday.
"I'm working now, and I can in any case see it. I can see the lights overhead," she said.
Hans Vera was cleared from Grindavik last month, however trusted before Monday's emission to get back to visit the family.
Yet, he said: "I don't see that later on they will allow individuals to draw near to Grindavik - so we are back in the cat-and-mouse game."
Iceland's unfamiliar clergyman, Bjarni Benediktsson said on X, previously Twitter, that "there are no interruptions to trips to and from Iceland, and global flight passages stay open".
"The planes [of lava] are very high, so it has all the earmarks of being a strong emission toward the start," he said.
Hallgrimur Indrioason, a journalist for the state-possessed Icelandic Public Telecom Administration (RUV), said the ejection should have been visible many kilometers away in Reykjavik, and depicted the view as "very terrific". jju
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