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Lagoa do Fogo (Earthcache)

A cache by dieSulzer Send Message to Owner Message this owner
Hidden : 03/19/2009
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Geocache Description:

Lagoa do Fogo

lagoa do Fogo é uma das maiores lagoas dos Açores e a segunda maior da ilha de São Miguel, e é classificada desde 1974 como reserva natural.

A lagoa do Fogo, ocupa a grande caldeira de vulcão adormecido do fogo. Este vulcão dá forma ao grande maciço vulcânico da Serra de Água de Pau, localizado no centro da ilha de São Miguel. Todas esta zona é rodeado por uma densa e exuberante vegetação endémica.

Esta caldeira vulcânica, tal como o vulcão que lhe deu forma é a mais jovem da ilha de São Miguel e ter-se-á formado há cerca de 15 000 anos. A sua configuração actual é resultado do último colapso, tido como importante e que ocorreu no topo do vulcão, há aproximadamente 5 mil anos. A última erupção data de 1563.

Esta Lagoa, é também a lagoa mais alta da ilha de São Miguel, facto que se deve a se encontrar no cimo de uma montanha cujo ponto mais alto se eleva a 949 metros. Localiza-se no topo do grande vulcão do Fogo, também conhecido como vulcão de Água de Pau. A caldeira tem forma de colapso tem forma elíptica e dimensões aproximadas de 3 x 2,5 km.

A lagoa devido a se encontrar no centro da cratera localiza-se a uma cota bastante mais baixa, encontrando-se a 575 metros. A profundidade máxima atingida nesta lagoa são os 30 metros. Dentro de todo o perímetro da Reserva Natural, lagoa, cratera, e vertentes da mesma, destacam-se bastantes espécies de plantas endémicas dos Açores.

A principal fauna, aqui representada pelos pássaros de pequenas dimensões é muitas vezes acompanhada por aves de grande porte como as aves de rapina. Assim, surge nos ares da lagoa, além das aves caracteristicamente terrestres.



Lagoa do Fogo (English: Lagoon of Fire) is a crater lake within the Agua de Pau stratovolcano in the center of the island of São Miguel Island in the Azores. The governmental authorities do not allow any modern construction around this lake. This lake is the highest above sea level on São Miguel Island.

Água de Pau is a stratovolcano in central part of São Miguel Island. About 30,000 to 45,000 years ago the 4 km wide and 7 km long outer caldera was formed. The inner caldera, which is 2.5 km wide and 4 km long was formed about 15,000 years ago. The younger inner caldera is partially filled by the crater lake Lagoa do Fogo. Until 5000 years ago the activity in the caldera created several post-caldera lava domes on the northern and western flank. Some of the cinder cones placed on the flank mark radial and concentric fissures. Some of them have been active during historical time. The latest known eruption took place in 1564. Some popular hot springs are located on the northwest flank.

A stratovolcano, also called a composite volcano, is a tall, conical volcano composed of many layers of hardened lava, tephra, and volcanic ash. These kinds of volcanoes are characterized by a steep profile and periodic, explosive eruptions. The lava that flows from them is viscous, and cools and hardens before spreading very far. The source magma of this rock is classified as felsic, having high to intermediate levels of silica (as in rhyolite, dacite, or andesite). This is in contrast to less viscous mafic magma that forms shield volcanoes (such as Mauna Loa in Hawaii), which have a wide base and more gently sloping profile.

Although stratovolcanoes are sometimes called composite volcanoes, volcanologists prefer to use the term stratovolcano to distinguish among volcanoes because all volcanoes of any size have a composite (layered) structure — they are built up from sequential outpourings of eruptive materials. Stratovolcanoes are one of the most common types of volcanoes.

To log this earthcache, you have to do:

1.) Tell us: How deep is the Lagoa do Fogo?
2.) A lot of plants and birds are endemic on the Azores, they live just here and nowhere else. Please, send us the name of two plants and two birds of them!

Photos from yourself in front of the lago are very welcome, but just optional, no obligation!

And, the most important: Enjoy the great view!

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