Iceland's sinking town: Subsidence that has seen buildings split in half and roads collapse is going to get WORSE and lava could flow from fissures for weeks, local experts warn

An Icelandic town is continuing to sink with gaping chasms tearing apart buildings and roads, as magma gathers just a few hundred metres beneath the surface amid the prospect of a volcanic eruption.

Magma rapidly made its way under Grindavik like an 'underground freight train', said Matthew James Roberts, a director at the Icelandic Met Office, who warned that 'nature always wins if the eruption lasts long enough'. 

While there may not be an explosion at the nearby Fagradalsfjall volcano, he told the BBC that lava could still flow from fissures 'for weeks' and hit Grindavik. 

Scientists have said that depending on where an eruption happens, it could 'certainly' flow into the fishing community, which was turned into a 'ghost town' after it was emptied of its 4,000 residents on Saturday.

As the area braces for a possible eruption, work is underway to urgently construct a huge wall which it is hoped could stop lava flows from hitting the town or a nearby geothermal power plant.

In case the worst happens, a large defensive wall, thought to be the biggest in Iceland, is being constructed to protect the Svartsengi geothermal power plant from lava flows.

The Reykjanes Peninsula, southwest of Reykjavik, has continued to be rocked by tremors, with 400 recorded so far since midnight and a 2,000-year-old fissure continuing to widen. 

The whole of the east of Grindavik is reportedly without electricity this morning, with subsidence potentially rupturing power lines overnight.

The continued movement of earth has also seen hot water from underground pipes burst out, with steam emanating from gaping cracks in roads and beneath homes.

Magma is thought to be as shallow as 500 metres beneath the surface, though some have expressed hopes that it could cool down and solidify rather than break through.

The activity indicates that there is 'still something going' on in the magma corridor, according to experts. 

'It's just been very similar to the past few days,' said Sigridur Kristjansdottir of the Norwegian Meteorological Agency this morning. 

'About eighty to a hundred earthquakes per hour, most below magnitude two, but a few above magnitude two.

'We also see an expansion in our GPS measurements, so there is still something going on.'

Thousands of quakes over recent days have wrecked houses and businesses, leaving many of the residents of Grindavik homeless or in limbo.

Resident Katrín Sigurdardóttir told local media that the uncertainty is the toughest part for her and her neighbours.

'The waiting is the worst because we don't know anything. It would be better if we knew the house was under lava because then we could just start from scratch,' she said. 'This uncertainty is so terribly difficult.'

Those who have been allowed to return to their properties with emergency services to collect belongings were ordered to evacuate on Tuesday after the Icelandic Met Office said its meters had detected increased levels of sulphur dioxide - a possible indicator of an eruption. 

Videos have shown apocalyptic scenes in the deserted town, with homes torn apart and gaping chasms opening up in roads.

Mother-of-four Magga Huld AfaÖmmudóttir, who was only given seven minutes to gather things from her house on Monday, said her family was left homeless after terrifying earthquakes completely wrecked their property.

'Friday was terrible, the earthquakes did not stop for many hours, but we left our house Friday night at 9pm with clothes for two days and two boxes of photo albums, then just planned to come the next day to pick up more,' Magga told MailOnline.

'I feel ok, but get scared and jump at the slightest sound, and then we are homeless in one minute - I've got all kinds of emotions going on,' said the 50-year-old.

'We got to go inside the house on Monday. We had seven minutes to pick up what we wanted to save, but the emphasis was on personal things from my family - my mother, grandmother and grandfather - and clothes.'

Sharing the video from inside her home, Magga described her devastation at losing the house she and her husband worked years to buy.

Footage shows how her home was ripped from its foundations by the force of relentless quakes, forcing the family to flee on Friday taking just a few belongings.

The southwestern Reykjanes Peninsula has been shaken by thousands of quakes since a seismic swarm hit on October 25. 

Located between the Eurasian and the North American tectonic plates, among the largest on the planet, Iceland is a seismic and volcanic hot spot as the two plates move in opposite directions.

In March 2021, lava fountains erupted spectacularly from a fissure in the ground measuring between 500-750 metres long in the region's Fagradalsfjall volcanic system. 

Volcanic activity in the area continued for six months that year, prompting thousands of Icelanders and tourists to visit the scene. 

In August 2022, a three-week eruption happened in the same area, followed by another in July of this year.