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San Juan Volcano, La Palma, Canary Islands.

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Photo ID: 714
Gallery ID: 40
Photo Title: San Juan Volcano, La Palma, Canary Islands.
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Keywords:
san juan volcano, duraznero volcano, nambroque volcano, caldera de taburiente, hoyo negro, cumbre vieja, la palma island, canary islands, oceanic islands, atlantic islands, volcanic islands, atlantic ocean, ocean, macaronesia, volcano, volcanic edifice, crater, volcanic crater, fissure, fracture, vent, fissure vent, active volcano, phreatomagmatic eruption, strombolian eruption, eruption, lava, magma, intrusion, crust, mantle, xenoliths, basanite, tephrite, phonotephrite, edifice failure, landslide, megatsunami
Description:
The large San Juan Volcano is a fissure vent system situated along the summits of the "Cumbre Vieja" the island's southern half and most active volcanic edifice. The San Juan volcano last initiated eruptions on the 24th of June 1949, with a Phreatomagmatic eruption from a fissure within the Duraznero volcano. 14 days later, this volcano shut down as a new fissure opened up some 3 Km away emitting a lava flow that was to reach the west coast. . Later on the 12 of July, the Hoyo Negro crater came to life, 700 metres north of the Duraznero, with a violent phreatomagmatic eruption, eruptions which were to last until the 27th of July. Finally following 3 days of inactivity, both the Hoyo Negro and Duraznero came to life again with 12 hours of intense activity, the Duraznero emitting huge quantities of lava from a number of emission points, filling the valley at the foot of the crater with a lake of lava that was to overflow down towards the east coast. Lavas emitted included basanites, tephrites and phonotephrites, with the final eruptions of basanites from the Duraznero bringing up abundant crustal and mantle xenoliths. During the 1949 eruption, a two kilometer-long fracture opened up and parts of the western half of the Cumbre Vieja ridge slipped several meters downwards towards the Atlantic Ocean. Scientists warn that a future eruption or major intrusion of magma into the cubre vieja, could result in a catastrophic edifice failure with the western half of the island, approximately 500km³ of land weighing an estimated 500 billion tons, collapsing into the ocean triggering a megatsunami. This view is looking north towards the Duraznero crater, the Nambroque volcano and the Hoyo Negro. In the far distance is the Caldera de Taburiente.
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