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One of the basic structures of the volcanic islands, is known as dorsal triple, first described for the island of Hawaii, consists of three volcanic alignments separated from each other 120 °. In this installment of the blog try to explain the appropriateness of calling this structure "tripod" based on similarities in behavior. Canary
There are 3 of these ridges being the most evolved of Tenerife (Teno and Anaga without), while La Palma and El Hierro are earlier stages of evolution, in that order.
In the picture 1 shows a small photo tripod, next to which it has drawn the outline of the island of Tenerife, and on the compression waves propagating from north of the island, red orientation (theoretical) of the dikes on the island.


As we saw in a previous issue concerning the triangular islands, once the wave front from the Atlantic Ridge reached the islands, crossing an area that acts like a slot Huygens (the width of a Huygens slot is small but significantly greater than the wavelength passing through it).
An elevation on the ocean floor, a change of density in the cortex, may function as a slot, ie to propagate through it to the compression wave is likely to lose its energy which is absorbed by the rock along the pattern defined by the interference wave in the slot, hence the typical form of these islands and the orientation of the volcanic dikes (which correspond to the places where the interference suffered positive reinforcement, the accumulated energy)
As we see the silhouette of the island fairly well to the small tripod, this similarity goes beyond. Like the tripod triangular island has its highest point at the junction of its legs, dorsal, has this point we will call summit here. This point coincides with the glens Tenerife and the Teide highest point or the Caldera and the Roque de los boys in Palma.
It should be noted, that with a loss of weight on top (eg erosion in the Caldera) the tripod may experience a rise in response, thus explaining underwater rocks found in the boiler to 500 m Taburiente high and possibly subsequent volcanism in the area due to the necessary rehabilitation of the tripod gets a lift (if the downturn in the volcanic caldera Taburiente)
While weight loss can lead to elevation of the summit, the mechanism principal elevation of this is the constant pressure from the ridge, which also produces General volcanism throughout the structure. In a next installment
see how the peculiar orientation of the dikes, triangular islands coupled with the ability to adjust in height depending on the weight bearing structure, has important implications in the evolution of the structures of the islands, mainly because called gravitational subsidence, of which there are three in the archipelago, the valleys of La Orotava and Guimar Ariane in increasing order of seniority

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tripod structure in Lanzarote and Fuerteventura Lanzarote and Fuerteventura 2 1

Figure 1, lines and colored areas indicate the direction of the dikes on the island (data obtained from Fuster and others and Stillman 1967 and 1987 mentioned in the guide Canarian volcanoes and geological routes). The island emerged in the initial common area Betancuria and slut. Later volcanism began in the north of Lanzarote and Fuerteventura. The front swept east Betancuria zone forming a channel along the African continental crust. This volcanism is responsible for the so-called knives Fuerteventura (narrow and elongated valleys east of the island) and is rejuvenating both islands (timanfaya and recent volcanic islands and north of Fuerteventura).
This second front is indicated in Figure 1 in red. The black circles are the alignments of volcanoes, as can be seen are perpendicular to the wave front, red arrows. The island of Graciosa and Lobos are part of the alignments for the main island. When this occurs Betancuria turning wavefront, channeled between this and the African plate, from north-northwest to south-southwest direction having a new bypass south of the peninsula of Jandia. Within the massif
Betancuria the north is older, relying on that there was a whirlwind (cone sheet) in the manner of Teno and Anaga Gomera Gran Canaria.
Swirl The existence of this rules out the possibility of a tripod structure (called rifts or back) as this does not occur in a tripod structure. Furthermore, the levees can be seen from Betancuria the Jandia peninsula (the oldest) are perpendicular (with the exception of the hurricane) to the levees to the south- this in Betancuria or south in Jandia latter being caused by the front from the north.
Note also that all wavefronts have the same direction, both from the north, the Jandia Lanzarote, and the Betancuria, with the proviso that passes through the north east of the island and reaches Jandia varying in its direction.