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.
Some 1,329 earthquakes with a magnitude of between 1.9 to 3.3 have been recorded on the volcanic island in the Azores archipelago since Saturday afternoon, said Rui Marques, head of the region's CIVISA seismo-volcanic surveillance centre.
Marques urged inhabitants to remain vigilant, although he said the earthquakes were of tectonic origin, referring to movement of the earth's tectonic plates, rather than volcanic. 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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