The Azores archipelago emerged from the Atlantic Ocean through violent geological forces. Nine islands sit atop a triple junction where three tectonic plates meet: the North American plate, the Eurasian plate, and the Nubian plate. This seismic activity created faults and fractures across the region. The first embryonic surfaces appeared in the waters of Santa Maria during the Miocene epoch around 8 million years ago. Pico Island rose most recently at 0.27 million years ago. Mount Pico stands as the highest point in Portugal at 2,351 meters. If measured from their base at the bottom of the ocean to their peaks, these mountains rank among the tallest on Earth.
Volcanic eruptions have shaped the landscape since human settlement began. From the 15th century onward, there were 28 registered volcanic eruptions. Fifteen occurred on land while thirteen happened beneath the sea. The last significant eruption took place off the coast of Faial in 1957. It formed the Capelinhos volcano. Eyewitnesses reported sulfuric gases and vapors released from the water along the coasts of Velas and São Jorge between February and December 1964. Seismic events remain frequent but usually measure low to medium intensity. An earthquake near Calheta in 1757 exceeded magnitude 7. A massive quake in 1522 destroyed Vila Franca do Campo and killed more than 5,000 people.
Discovery And Early Settlement History
In 1427 a captain sailing for Prince Henry the Navigator possibly discovered the Azores. Gonçalo Velho may have been that captain though records remain uncertain. Thomas Ashe wrote in 1813 about a Fleming named Joshua Vander Berg who made landfall during a storm en route to Lisbon. Settlers built houses and cleared bush to plant crops like grain and grapevines. They brought domesticated animals including chickens rabbits cattle sheep goats and pigs.
Settlement began in 1439 with migrants from mainland Portugal. People arrived mainly from Algarve and Alentejo provinces. São Miguel was first settled in 1449 under Cabral's command at modern-day Povoação. By 1490 there were 2,000 Flemings living on Terceira Pico Faial São Jorge and Flores. The islands became known as the Flemish Islands due to this large population. Willem van der Haegen arrived at Topo on São Jorge where he lived and died. He became known locally as Guilherme da Silveira. João Vaz Corte-Real received the captaincy of the island in 1483. Velas became a town before the end of the 15th century.