RT Journal Article
T1 The crustal structure of El Hierro (Canary Islands) from 3-D gravity inversion
A1 Benavent Merchán, María Teresa
A1 Montesinos, F. G.
A1 Vieira, R.
A1 Arnoso, J.
AB El Hierro is the youngest and westernmost island of the Canarian Archipelago. Due to its singular and interestingcharacteristics, with extensive landsliding, studying its crustal structure can provide very useful information about its originand evolution. With this aim, we use the gravity inversion methodology obtaining a crustal model of mass distribution. Weperformed a gravity survey of the entire island, completing the gravity anomaly map of this area with marine data from theUnited States Geological Survey. The calculated Bouguer gravity anomaly map was studied using a covariance analysis and theleast squares technique. To obtain crustal information from these data, we used a 3D gravity inversion based on geneticalgorithms (GA). Thus, our inversion technique aims to determine the geometry of the sources of the observed gravity field,upon a prismatic partition of the subsoil volume, and adopting a priori density contrast values. The results of this gravity studyof El Hierro Island show the correlation of several volcanic structures with the distribution of the gravity field sources. Thecharacteristic triple rift system of the island is associated with low-density areas, and the older volcanic stages with high-densitystructures. We also found differences among the structures related to the several landslides, which helped the island takes shape.
PB Elsevier Science
SN 0377-0273
YR 2006
FD 2006-03
LK https://hdl.handle.net/20.500.14352/49824
UL https://hdl.handle.net/20.500.14352/49824
LA eng
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