As I told you in the previous chapter, my trip to the island of El Hierro were primarily intended to map the orientation of the dikes main island, and the result is the image on the right. As you can see do not seem too, must take into account that only interest the guidelines as a whole group of them is represented by one that represents them all. In the southern tip of the island (very eroded) are not visible levee so I've included a map of the island of La Palma with the guidelines I've listed so far and complete the missing iron.
The photograph top left shows a close up of the end of the test I did with the laser, I've uploaded, because of a simple bright lines that are seen in the image, this was the first major surprise at the direction of dikes, I found on the island. But here is the top right image, it is represented to the island of iron in the left side represents the wave front and its progress as the construction of Huygens and on the right side of radius vector, the latter match the address with the levees in the plane that I made on the island of iron.
As you can see the bright lines of the image on the left (the laser) follow the same pattern as inclining toward the center of the light tip to overlap in the center with the same direction.
in the picture below you can see how the direction of the levees is leaning right and left of the southern tip of the island to take the direction of the southern tip of the island as in laser light and is explained on the right side of the photograph of Iron.
finally pay attention to the left of the photo upper right which represents the construction of Huygens on the wave that propagates in the interior of the island, the direction of the vectors and therefore radio of dykes is inferred from of the tangents to the spherical waves that arise Huygens building house one of the wavefront, since these carry the energy of the wavefront-radiovectores levees (which are nothing more than areas in which light energy is expressed as burst pressure in the rock) are at points that are touched two secondary waves in the right direction, these directions being tangent to these secondary fronts that match the radiovectores (s that laser light lines and address of the levees).
Well this is also the cause of the sporadic existence of dikes perpendicular to the generals, it happens that in areas with high density of dykes receive one or at most two perpendicular to them, this happens for example in front of the entrance to the Parador Hierro National among a group of about 25 or 30 levees seen a perpendicular the rest, the rock stiffened by compression of the main wavefront sporadically breaking efforts to fracture under lesser amount that the radiovectores from carrying the main effort.
and finish for today with a final example of compression waves are common in nature u throw a stone in the sand on the beach, the shows, (the sand is sprinkled along radial lines) even better if you can disponeis a telescope have a look at lunar craters shock waves produced by the asteroid impact that led to clearly manifest in the form of rays that emerge from the crater.
enough for today In the coming days I will write about the why of the rounded shape of Gran Canaria and La Gomera or relationship between the laws of optics of Descartes and the rise of volcanic magma, but that is another day.