“It’s an enigma, a mystery,” said seismologist Joao Fontiela, explaining that multiple tremors were common on other Azorean islands but not on Sao Jorge. “I haven’t found a clear answer yet.”
“Going from a very small number of earthquakes to thousands is extraordinary”said.
The volcanic alert is at level 4, which means there is a “real chance” the volcano could erupt. But when, where on the island and if it will actually happen are unanswered questions, Fontiela said.
Until now, all recorded earthquakes have been of tectonic and non-volcanic origin, reaching a magnitude of up to 3.8. If they become volcanic, it means that the magma is in motion.
The number of daily earthquakes has decreased in recent days, but experts are not sure that trend will continue.
Ground deformations have already been detected, which is unusual given the tremors’ tectonic origin and low magnitude, Fontiela said.
According to Fontiela, the lack of previous studies on Sao Jorge is making it difficult to understand the phenomenon.
Geologist José Madeira said it was unclear what type of eruption might take place, adding that previous seismic events at Sao Jorge in 1580 and 1808 were marked by deadly pyroclastic flows.
Volcanologists also monitor gases in the ground and the depth of earthquakes.
Sao Jorge earthquakes occur at an average depth of between 8 and 12 kilometers. If a significant number starts to occur closer to the surface, it could indicate an imminent eruption, Madeira said.
The authorities have warned that the situation could continue for an indefinite period of time.
Source: Ambito
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