Etna's new lava flow on 10 Aug 2025 (image: Giuseppe Distefano / EtnaWalk.it / Facebook)A new lava flow erupted from a small vent at the southern base of the summit craters a few days ago. It is emerging from the area between Bocca Nuova and the South-East crater and slowly moving downslope at an altitude of approx. 3,000-3,100 m.The activity began Saturday (9 Aug) morning and has been very modest in effusion rate; no significant seismic activity or volcanic tremor has been detected accompanying it, but it might slowly increase if it is going to evolve similar as the sub-terminal effusive eruption earlier this year in February-March, which lasted several weeks. Volcanic tremor is indeed showing a slowly climbing trend over the past days.According to the volcano observatory, the source of volcanic tremor is at an altitude of approximately 2,800 m in an area between the Voragine and the northeast crater, interpreted as the location of the shallow reservoir feeding the eruption. No significant infrasound activity from explosive activity have been detected, although visual observations showed that small explosions have indeed been occurring occasionally from the SE crater during the past week.Data from deformation networks and other measured parameters such as gas emission and composition show no unusual anomalies.Vertical view of the lava flow and its effusive vent (image: Giuseppe Distefano / EtnaWalk.it / Facebook)