Vulcão da Serreta, Submarine volcano near Terceira Island, Azores, Portugal
Vulcão da Serreta is a submarine volcano located west of Terceira Island in the Azores, sitting along an underwater fissure zone in the Atlantic Ocean. Its eruption vents lie at significant depth beneath the sea surface and are monitored by a network of sensors placed around the island.
The volcano first showed signs of eruption in May 1867, following intense seismic activity that had started in December 1866. It became active again between 1998 and 2000, producing surface phenomena that attracted the attention of researchers worldwide.
Fishermen from Terceira Island know the waters to the west well and pay attention to changes in water temperature or unusual gas bubbles at the surface. These natural signs are seen as part of everyday life at sea in this part of the Azores.
The best way to get a sense of this underwater volcano is from the western viewpoints of Terceira Island or from a boat on the open water above the site. The volcano itself cannot be visited directly, as the area is primarily used for scientific monitoring.
During the 1998 to 2000 eruption, the volcano produced large lava balloons that floated up to the sea surface, where they either burst or sank as they cooled. Scientists documented this rare event closely, as lava balloons of this size are seldom observed during underwater eruptions.
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