GC1CQPV Caldera de Bandama (Earthcache) in Islas Canarias, Spain created by geohaantjes

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GeoGekko2: After five years our earthcache will be archived.
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Geohaantjes

GC1CQPV ▼

A cache by geohaantjes Message this owner

Hidden : 5/29/2008

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Size: Size: not chosen (not chosen)

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Geocache Description:

Caldera Bandama is the crater of a volcano in all its majesty, and a reminder of the volcanic origin of the whole archipel. Crater can be visited, but the gate will close at 17:00 hour!

Caldera de Bandama

Geological History

A caldera is a volcanic feature formed by the collapse of land following a volcanic eruption. They are sometimes confused with volcanic craters. The word comes from Spanish, meaning "bowl". In some texts the English term cauldron is also used.
A collapse is triggered by the emptying of the magma chamber beneath the volcano, usually as the result of a large volcanic eruption. If enough magma is erupted, the emptied chamber will not be able to support the weight of the volcanic edifice above it. A roughly circular fracture - the "Ring Fault" develops around the edge of the chamber. These ring fractures serve as feeders for fault intrusions which are also known as ring dykes. Secondary volcanic vents may form above the ring fracture. As the magma chamber empties, the centre of the volcano within the ring fracture begins to collapse. The collapse may occur as the result of a single cataclysmic eruption, or it may occur in stages as the result of a series of eruptions. The total area that collapses may be hundreds or thousands of km2.

The Caldera de Bandama is a caldera that reaches 569 m (1,867 ft) above sea level at the highest point on its rim, Pico de Bandama, and is about 1,000 m (3,300 ft) wide and 200 m (700 ft) deep.
However, the importance of Bandama, a place where grapes were once grown and wine produced in the last century, is due not only to its landscape and plants, some of which are unique, but also to its archeology, as inside the caldera, in the north wall to be precise, there are various caves used by the original Islanders as silos and homes.
Caldera de Bandama is named after Dutchman Daniel Van Damme who came here in the 16th Century.
The sequence of the eruption of the Bandama volcano is perfectly descriped at the information board you will be visiting.

How to log this cache?
This is an EarthCache so you won't find any items, box, physical cache or logbook at this site.
To log this cache just answer these two simple questions. Taking a picture of yourself at the caldera holding your GPSr is optional. Email the answers to us.
You can find the answers at the info board just behind the iron entrance gate at (this board is destroyed, you may send a picture of the board instead of the answers)
N 28°02.112'
W015°27.592'
or walking the Sendero Borde de Crater at
N28°01.815'
W015°27.549'

1) What’s the age of the volcano, which makes it one of the youngest vulcano’s on Gran Canaria?
2) The different materials created by the eruption of the Bandama volcano cover an area of over ??? kilometres

If you choose to make a picture, please make it half way down the crater nearby
N 28°02.080'
W015°27.500'

E-mail the answers to geohaantjes@hotmail.com
If you took a picture, please place it in your log. It also would be nice if you mentioned your nationality in your log.

The steep walk to the 'take picture place' and back takes about 30 minutes including (photo)stops.
A walk to the bottom of the caldera takes about half an hour. Up again will probably take one hour.
Walking the Sendero Borde de Crater is almost 7 km. Caution: the gate will close at 17:00 hour!

Note: Logs from teams emailing incorrect answers will be removed without further notice!

Additional Hints (No hints available.)