Three-dimensional inverse modelling of magnetic anomaly sources based on a genetic algorithm

Aeromagnetic anomalies reveal the link between magmatism and tectonics during the early formation of the Canary Islands

“…This means that the remanent magnetization J R can be assumed to be parallel to the geocentric axial dipole magnetic field in Gran Canaria, with a declination D = 0° and an inclination I = 48° (latitude 28°N). Although we made a first estimation of the magnetization direction 33 using the method of Nicolosi et al . 35 , we have now considered that the geocentric axial dipole direction is the most reliable hypothesis for the definition of the magnetization vector.…”

“…The modelling of the source of this magnetic anomaly was accomplished by means of the inverse approach developed by Montesinos et al . 33 . The method is based on a genetic algorithm that estimates the geometry and location of a homogeneously magnetized source from a 3-D prismatic partition of the subsoil volume while assuming a constant magnetization within each cell.…”

“…Here, our objective was to study in detail the reverse dipole anomaly over the marine part of the volcanic edifice of Gran Canaria because of the relevant tectonic implications of such a structure. The development of an advanced 3-D inverse method based on a genetic algorithm 33 enabled a significant increase in the quality of the modelling of this magnetic source, which we interpret as a magmatic intrusion emplaced during the building of the submarine edifice of Gran Canaria. This anomaly was used as an example in a recently published methodological paper in which our 3-D inverse method was presented 33 .…”

“…The development of an advanced 3-D inverse method based on a genetic algorithm 33 enabled a significant increase in the quality of the modelling of this magnetic source, which we interpret as a magmatic intrusion emplaced during the building of the submarine edifice of Gran Canaria. This anomaly was used as an example in a recently published methodological paper in which our 3-D inverse method was presented 33 . In this study, we refined those earlier modelling efforts and provided an in-depth discussion of the implications derived from our fresh results.…”

GamField 2.0 - Significant advances to synthetic potential fields data generator

“…http://geosoftware.sci.ingv.it where a forum has been set-up for GaMField users and for other possible future geophysical software applications. GaMField has been downloaded by hundreds of users and it has got citations since its presentation [Tontini 2012, Speranza et al 2012, Al-Rahim 2013, Jeshvaghani and Darijani 2014, Speranza and Minelli 2014, Guo et al 2015, Montesinos et al 2016, Pan et al 2016, Kim and Wessel 2016. Many researchers have joined the web forum and provided with a large number of comments and suggestions for im-provements.…”