The Global Boundary Stratotvpe Section and Point of the Toarcian-Aalenien Boundary (Lower-Middle Jurassic) in Fueuntelsaz Section is the first GSSP defined in Spain. Among the requirements of the ICS for the choice of the best boundarv level are accessibilitv to the type-section and free access for research, and guarantees from the respective authority concerning to the free access and the permanent protection of the site. In our point of view, the most suitable protection figure to safeguard the fulfilment of the ICS's requirements according to the Spanish Conservation Policy and Legislation is the Natural Monument. This paper deals with the consevation management and classification of the Fuentelsaz area as a Natural Monuntent. being the Comunidad de Castilla-La Mancha Authorities the ones that have to take the necessary steps to protect the site.
We present a routine for 3D magnetotelluric (MT) modeling based upon high-order edge finite element method (HEFEM), tailored and unstructured tetrahedral meshes, and high-performance computing (HPC). This imple- mentation extends the PETGEM modeller capabilities, initially developed for active-source electromagnetic methods in frequency-domain. We assess the accuracy, robustness, and performance of the code using a set of reference models developed by the MT community in well-known reported workshops. The scale and geological properties of these 3D MT setups are challenging, making them ideal for addressing a rigorous validation. Our numerical assessment proves that this new algorithm can produce the expected solutions for arbitrarily 3D MT models. Also, our extensive experimental results reveal four main insights: (1) high-order discretizations in conjunction with tailored meshes can offer excellent accuracy; (2) a rigorous mesh design based on the skin-depth principle can be beneficial for the solution of the 3D MT problem in terms of numerical accuracy and run-time; (3) high-order polynomial basis functions achieve better speed-up and parallel efficiency ratios than low-order polynomial basis functions on cutting-edge HPC platforms; (4) a triple helix approach based on HEFEM, tailored meshes, and HPC can be extremely competitive for the solution of realistic and complex 3D MT models and geophysical electromagnetics in general. ; This project has been 65% cofinanced by the European Regional Development Fund (ERDF) through the Interreg V-A Spain–France– Andorra program (POCTEFA2014-2020). POCTEFA aims to reinforce the economic and social integration of the French–Spanish–Andorran border. Its support is focused on developing economic, social and environmental cross-border activities through joint strategies favoring sustainable territorial development. BSC authors received funding from the European Union's Horizon 2020 programme, grant agreement N◦828947 and N◦777778, and from the Mexican Department of Energy, CONACYT-SENER Hidrocarburos grant agreement N◦B-S-69926. ; Peer Reviewed ; Postprint (published version)
