The latest photograph showed the glowing lava pouring down the slopes and lighting up the ash cloud above Philippines’ most active volcano in central Albay province.
Lava flowed down from its crater as magma continued to move beneath, while a huge plume soared as high as 2,500m above the glowing peak today.
Mount Mayon is showing no signs of calming down soon, said Paul Alanis of the Philippine volcanology agency.
“Right now our instruments around the volcano are measuring or detecting magma constantly coming up from below,” Mr Alanis told Reuters.
“So there’s always that danger, that this may still escalate.”
Scientists recorded regular episodes of intense activity throughout the day.
Tourists, residents and media gathered at vantage points to document the drama at the country’s most impressive volcano, which last erupted in 2014.
Mayon’s unrest has displaced about 75,500 people, the majority of whom are in evacuation centres, where children lined up for meals and parents braced for the possibility of a long stay away from home.
“We are worried. We got used to the volcano, but we are still afraid,” said one evacuee, Irene Agao.
“If only we could, we would go home right now, away from this evacuation centre, but we need to stay. Because we never know what else the beautiful Mayon volcano will do.”
Government offices and schools have been closed in 17 towns and municipalities and 66 flights have been cancelled in recent days. The authorities have warned residents far from the area to stay indoors to avoid heavy ash fall.
The alert remains just one notch below the highest level of 5, after five more episodes. The provincial government has expanded the no-go area around the 2,462-metre (8,077-foot) Mayon to a radius of 9 kilometres.
The Philippine Institute of Volcanology and Seismology (PHIVOLCS) has also shared the video above of an eruption of lava at 6.11am local time yesterday.
Red hot lava spewed out of the crater six times between 6.02am local time on Wednesday and 3am local time today, according to PHIVOLCS.
The lava fountains reached 400m to 500m high, ash plumes soared up to 5km above the crater, 13 tremors were recorded and there were “numerous rockfall events”.
READ MORE: MAYON VOLCANO ERUPTION VIDEO