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Pico Island
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Topic: Pico Island (Read 1559 times)
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dhill757
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Re: Pico Island
«
Reply #15
on:
December 20, 2012, 01:45:41 am »
Mount Pico is part of the Madalena Volcanic Complex, one of three volcanological units that comprise the island of Pico, associated with three historic eruptions in 1562, 1718 and 1720.[1] Current morphology suggests an age dating to the Holocene age, confirmed by radiocarbon dates younger than 6000 years.[1][2][3]Structurally, this complex can be subdivided into two other sections: the Pico Volcano and the East Fissural Zone.[1]
Pico is a stratovolcano, with a pit crater on its summit.[1] Pico Alto the round crater about 500 meters (1,600 ft) in diameter and 30 meters deep tops the volcano, with Piquinho (Pico Pequeno) a small volcanic cone rising 70 meters within it to form the true summit. Meanwhile, the East Fissural Zone comprises several alignments of Hawaiian/Strombolian scoria cones and associated lava flows, which overflowed many of the cliffs, cut in older units and originated lava deltas (Portuguese: fajãs).[1]
The tectonic structure is characterized by two fault systems.[1] The main WNW-ESE structures are the dextral faults of Laoga do Capitão and Topo, that merge to the east, forming a narrow shallow graben.[1] To the west, the graben is completely covered by the Pico stratovolcano occurring less than 10,000 years ago, and infilled by lava flows and cones of the Eastern Fissural zone, that includes many of the volcanic alignments and scarps.[1] The second fault zone, running NNW-SSE, are markedly less in number and includes normal left lateral, oblique slip faults responsible for the main volcanic eruptions: the Lomba de Fogo-São João fault (basis of the 1718 eruption)and the Santo António volcanic alignment.[1]
On top of Pico (Piquinho) there is an area of permanent degasification characterized by the emission of water vapour at a temperature of between 50ºC to 75°C. In addition, other vents also exist between 1,500 metres (4,900 ft) and 2,000 metres (6,600 ft) above sea level, as well as diffuse degasification along the graben between the Lagoa do Capitão and Topo faults. There is also a carbon dioxide-rich spring in the locality of Silveira (along the southern coast of Lajes do Pico, formed in the base of Pico.
Hiking trails are available and the ascent to the summit can be made in around two to four hours from the trail-head for fit persons depending on weather which can be quite treacherous especially in winter months.
References
Notes
^ a b c d e f g h i José Madeira & António Brum da Silveira (October 2003), p.748
^ Madeira (1998)
^ Nunes (1999)
Sources
Scarth, Alwyn; Tanguy, Jean-Claude (2001). Volcanoes of Europe. Oxford University Press. pp. 132–136. ISBN 0-19-521754-3.
Nunes, J.C. (1999) (in Portuguese), A actividade vulcânica na ilha do Pico do Plistocénio Superior ao Holocénio: Mecanismo eruptivo e hazard vulcânico. Tese de doutoramento no ramo de Geologia, especialidade de Vulcanologia, Ponta Delgada (Azores), Portugal: University of the Azores, pp. 357 pp.
Madeira, José (1998) (in Portuguese), Estudos de neotectónica nas ilhas do Faial, Pico e S. Jorge: uma contribuição para o conhecimento geodinâmico da junção tripla dos Açores. Tese de Doutoramento no ramo de Geologia, especialidade em Geodinâmica Interna, Faculty of Sciences, University of Lisbon, pp. 428pp
Madeira, José; Silveira, António Brum da (October 2003), "Active Tectonics and First Paleoseismological Results in Faial, Pico and S. Jorge Islands (Azores, Portugal)", Annals of Geophysics, 46, Bologna, Italy: INGV, Istituto Nazionale di Geofisica e Vulcanologia, pp. 733–761
Global Volcanism Program: Pico
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dhill757
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Re: Pico Island
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Reply #16
on:
December 20, 2012, 01:48:24 am »
Mount Pico as seen from above
Elevation 2,351 m (7,713 ft)
Prominence 2,351 m (7,713 ft)
Parent peak None - HP Pico
Listing Country high point
Ultra
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dhill757
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Re: Pico Island
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Reply #17
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December 20, 2012, 01:49:14 am »
An image of the island of Pico, showing Mount Pico (1848)
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dhill757
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Re: Pico Island
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Reply #18
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December 20, 2012, 01:50:02 am »
The landscape of the East Fissural Zone with some escoria cones
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dhill757
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Re: Pico Island
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Reply #19
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December 20, 2012, 01:50:37 am »
The pinnacle of the island and mountain: Pico Piquinho, also known as Pico Pequeno
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dhill757
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Re: Pico Island
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Reply #20
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December 20, 2012, 01:51:24 am »
The pit crater rim of Pico Alto on the summit of Pico
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dhill757
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Re: Pico Island
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Reply #21
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December 20, 2012, 01:51:59 am »
Fumarole
http://en.wikipedia.org/wiki/Fumarole
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dhill757
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Re: Pico Island
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Reply #22
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December 20, 2012, 01:55:44 am »
http://www.flickr.com/groups/pico
http://www.trekearth.com/gallery/Europe/Portugal/photo272481.htm
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FLOR_DE_LIS
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Posts: 8
Silence is gold, and often is the answer!
Re: Pico Island
«
Reply #23
on:
May 04, 2015, 02:02:23 pm »
Hi dhill757 , fantastic photos of the Islands of Azores , for you knoledge , i'd some Profile problems, but i'm back !
regards
FL
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FL
dhill757
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Re: Pico Island
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Reply #24
on:
May 05, 2015, 12:48:00 am »
Thanks, FLOR_DE_LIS, and welcome back to the forum. Looking at the pictures of the flora and fauna of the Azores, it is hard to believe they weren't once a part of Atlantis.
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