The Azores is still shaking as scientists try to understand the cause of the earthquakes

Full of skepticism, experts are scrambling for answers to explain the unusual seismic activity that has rocked the volcanic island of São Jorge in the mid-Atlantic, in Portugal’s Azores archipelago, for more than two weeks.

The island has experienced nearly 27,000 small tremors as of Tuesday, and there are fears that the activity could herald the first volcanic eruption since 1808 or a strong earthquake.

“It’s a mystery, a mystery,” says seismologist Joao Fontilla, explaining that multiple tremors were common on other Azores but not São Jorge. “I still haven’t found a clear answer.”

“Going from very few earthquakes to thousands is unusual,” he adds.

Volcanic alert is at level 4, which means there is a “real possibility” that the volcano will erupt. The unanswered questions, Fontella says, are when and where on the island and whether they will actually happen.

To date, all earthquakes recorded have been of tectonic rather than volcanic origin, with magnitudes reaching 3.8. If it becomes volcanic, this means that the magma is moving.

The number of daily earthquakes has decreased in recent days but experts are not sure if this trend will continue.

Earth deformation has already been detected, which is unusual given the tectonic origin of the earthquakes and their low strength, according to Fontella.

The lack of previous studies on São Jorge makes this phenomenon even more difficult to understand.

It wasn’t clear what type of eruption could occur, geologist Jose Madera said, adding that earlier seismic events in São Jorge in 1580 and 1808 were characterized by deadly volcanic flows (fast-moving streams of hot gas and volcanic material flowing along the Earth. at 100 speeds). how much).

Volcanologists also monitor soil gases and earthquake depths.

São Jorge earthquakes occur at depths between 8 and 12 km. If a large number begin to appear near the surface, this could indicate an imminent eruption, according to the neighboring island of Madeira.

The authorities warned that the situation could take an indefinite period of time.

Where are the Azores?

The Azores, an autonomous region of Portugal, is an archipelago located in the middle of the Atlantic Ocean.

The islands feature stunning landscapes, fishing villages, green pastures, and blue hydrangea hedges.

There are nine main islands in the Azorean and a small island group, in three main groups. These are Flores and Corfu, to the west; Graciosa, Terceira, São Jorge, Pico and Faial in the middle; and São Miguel, Santa Maria, and Formigas Reef to the east.

São Miguel is the largest and is famous for its tea plantation in Gorreana.

São Jorge, where the tremors occur, is known for its Vajas – coastal plateaus that are home to many of the island’s smaller villages. Fagas was formed by ancient landslides in the north where the sea cliffs are very steep, creating the best natural swimming pools in the Azores.

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