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Isola di Pasqua

Rapa Nui

Vulcano a scudo · Chile · 501 m

Waves lap against the northern coast of Easter island.  This view looks from Obahe to Mahatua with Volcán Poike, a shield volcano forming the eastern tip of the island, on the horizon.  The trachytic lava domes of Tea-Tea are the small peaks on the left horizon.  The triangle-shaped Easter Island, renowned for its dramatic megalithic statues of hand-carved basalt, sits atop the Sala y Gómez submarine ridge, which trends eastward from the East Pacific Rise.  The island is composed of three principal volcanoes, Poike, Rano Kau, and Terevaka.
Waves lap against the northern coast of Easter island. This view looks from Obahe to Mahatua with Volcán Poike, a shield volcano forming the eastern tip of the island, on the horizon. The trachytic lava domes of Tea-Tea are the small peaks on the left horizon. The triangle-shaped Easter Island, renowned for its dramatic megalithic statues of hand-carved basalt, sits atop the Sala y Gómez submarine ridge, which trends eastward from the East Pacific Rise. The island is composed of three principal volcanoes, Poike, Rano Kau, and Terevaka. · Foto: Photo by Oscar González-Ferrán (University of Chile). · Wikimedia Commons
Tipo
Vulcano a scudo
Paese
Chile
Regione
Southern Pacific Volcanic Regions / Salas y Gómez Ridge Volcano Group
Altitudine
501 m
Coordinate
-27.114, -109.356
Ultima eruzione
Sconosciuto
Contesto tettonico
Rift zone / Oceanic crust (< 15 km)
Forma vulcanica
Shield
Roccia principale
Basalt / Picro-Basalt
Sintesi geologica

The triangular Rapa Nui (also known as Isla de Pascua, or Easter Island), is renowned for its dramatic megalithic statues of hand-carved basalt. The island sits atop the largely submarine Salas y Gómez Ridge, which trends eastward from the East Pacific Rise. It is composed of three principal volcanoes and more than 70 subsidiary vents. Rano Kau at the SW tip includes flat-bottomed crater 1.5 km wide, while Poike volcano is at the E point; both are of Pleistocene age. Terevaka is a broad shield volcano of Pliocene-to-Pleistocene age at the northern point of the island, which is capped by many pyroclastic cones; the last stage of activity consisted of eruptions from multiple rift zones. The latest lava flows, at Hiva-Hiva near the west-central coast, are thought to be less than 2,000 years old.

Sintesi da Wikipedia

L'isola di Pasqua o Rapa Nui è un'isola dell'oceano Pacifico meridionale appartenente al Cile, avente come capoluogo Hanga Roa.

Wikipedia · CC BY-SA · Leggi l'articolo completo

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