A series of multiple small earthquakes that have been rattling the mid-Atlantic Portuguese island of Sao Jorge for three days could trigger a stronger tremor or a volcanic eruption, experts said on Tuesday.
The number of earthquakes recorded on the volcanic island of Sao Jorge, in the Azores archipelago, since Saturday afternoon has increased to around 1,800 from an earlier figure of 1,329, said Rui Marques, head of the region's CIVISA seismo-volcanic surveillance centre.
The series of small quakes, known as a swarm and which have caused no damage so far, were reported along the island's volcanic fissure of Manadas, which last erupted in 1808."All scenarios are on the table," Marques told Antena 1 radio station. "On one hand, we could see an earthquake of greater magnitude that can cause some destruction. ... On the other hand, we have the scenario of an eruption.
CIVISA set up two additional seismic monitoring stations on the island and deployed a team to measure soil gases, an indicator of volcanic activity. Levels seemed normal so far, Marques said.
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