GNGTS 2018 - 37° Convegno Nazionale

GNGTS 2018 S essione 3.1 583 and compared with the LCS-1 data at both 100 km and 400 km altitude. Despite the use of high-resolution SWARM data in the LCS-1 model, several differences in intensity and anomaly location are found between the maps of the aeromagnetic field and satellite magnetic field. The Adriatic magnetic anomaly has been studied in three main steps: • We firstly performed a multiscale analysis of the aeromagnetic and LCS-1 datasets employing the Multiridge method (Fedi et al. , 2009) to obtain preliminary results on source locations and depth estimation. • 2D forward modeling of the Adriatic crust along vertical profiles was carried out assuming as constrains the results of the multiscale analysis. • 3D inversion of the aeromagnetic dataset employing classical method of potential field data inversion (e.g. Li Oldenburg, 1996, 2003; Lane et al. , 2007). Satellite model data inversion, instead, was performed by using the magtess-inversion software package (https://github.com/eldarbaykiev/magtess-inversion ) which is based on the evaluation of the magnetic effect of a tesseroid model of the Earth’s crust (Baykiev et al. , 2016). The results of the Multiridge analysis point out the location of magnetic singularities at intermediate crustal depths. Moreover, the evaluation of the homogeneity degree from the ridges agree with previous interpretations of the Adriatic anomaly, which point out the presence of sub-circular magmatic intrusion into the middle-upper crust responsible of the low-wavelength component of the magnetic anomaly (e.g. Giori et al. , 2007; Mancinelli et al. , 2015). On the other hand, the long-wavelength signal dominating at high altitudes is modelled trough satellite data and aeromagnetic data inversion, by which strong variation of magnetic susceptibility in the lower crust are retrieved, as result of the magnetic basement uplift during the evolution of the Apennine and Dinarides geodynamical events (e.g. Scrocca et al. , 2003; Finetti et al. , 2005). Therefore, 3D models of the Adriatic crust are produced and proposed as possible explanation of the large-scale magnetic anomaly. As result, we consider satellite model data useful to model the large-scale component of the lithospheric magnetic field and to interpret the average properties of the crust. The analysis of the aeromagnetic field, instead, allowed obtaining high-detail information of the structural and magnetic setting, both at small and large-scale. References Baykiev, E., Ebbing, J., Brönner, M., & Fabian, K. 2016. Forward modeling magnetic fields of induced and remanent magnetization in the lithosphere using tesseroids. Computers & Geosciences, 96, 124–135. Fedi, M., G. Florio, and T. Quarta, 2009. Multiridge analysis of potential fields: Geometrical method and reduced Euler deconvolution, Geophysics, 74(4), L53–L65. Finetti, I.R., Del Ben, A., 2005. Crustal tectono-stratigraphic setting of the Adriatic Sea from new CROP seismic data. CROP Project. In: By, I.R., Finetti (Eds.), Deeep Seismic Exploration of the Central Mediterranean and Italy. Elsevier, Amsterdam, pp. 519–547, Atlases in Geoscience 1. Fletcher, K. M. U., J. D. Fairhead, A. Salem, K. Lei, C. Ayala, and P. L. M. Cabanillas, 2011. Building a higher resolution magnetic database for Europe for resource evaluation, First Break, 29, 96–101. Giori, I., Caratori Tontini, F., Cocchi, L., Carmisciano, C., Bologna, C., Camorali, C., Samarzija, J., Taylor, P., 2007. The adriatic magnetic anomaly. In: EGM 2007 International Workshop Innovation in EM, Grav and Mag Methods: A New Perspective for Exploration Capri, Italy, 16–18 April. Mancinelli, P., Pauselli, C., Minelli, G., & Federico, C., 2015. Magnetic and gravimetric modeling of the central Adriatic region. Journal of Geodynamics, 89, 60–70. Olsen, N., Ravat, D., Finlay, C. C., & Kother, L. K., 2017. LCS-1: a high-resolution global model of the lithospheric magnetic field derived from CHAMP and Swarm satellite observations. Geophysical Journal International, 211(3), 1461–1477. Scrocca, D., Doglioni, C., Innocenti, F., 2003. Contraints for an interpretation of the Italian Geodynamics: a review. In: Scrocca, D., Doglioni, C., Innocenti, F., Manetti, P., Mazzotti, A., Bertelli, L., Burbi, L., D’Offizi, S. (Eds.), CROPAtlas: Seismic Reflection Profiles of the Italian Crust, 62. Mem. Descr. Carta Geol. It., pp. 15–46.