GNGTS 2019 - Atti del 38° Convegno Nazionale

658 GNGTS 2019 S essione 3.2 contenute. Gli autori sono in debito con Koya Suto per il suo aiuto nell’organizzazione delle indagini ERT e con OYO Corporation per aver fornito parte della strumentazione ERT. Bibliografia Papadopoulos N.G., Yi Myeong-Jong, Kim Jung-Ho, Tsourlos P., Tsokas G.N. (2010), Geophysical investigation of tumuli by means of surface 3D Electrical Resistivity Tomography, Journal of Applied Geophysics, 70, 192–205. Pipan, M., Baradello, L., Forte, E., and Finetti, I., 2001, Ground penetrating radar study of Iron Age tombs in southeastern Kazakhstan, Archaeology Prospection, 8, 141–55. Tonkov, N., Loke, M.H., 2006. A resistivity survey of a burial mound in the “Valley of the Thracian Kings”. Archaeological Prospection 13, 129–136. Tsourlos P., Papadopoulos N.G., Yi Myeong-Jong, Kim Jung-Ho, Tsourlos P., Tsokas G.N. (2014), Comparison of measuring strategies for the 3-D electrical resistivity imaging of tumuli, Journal of Applied Geophysics, 101, 77–85. Tsude H. (1987) The Kofun Period. Recent Archaeological Discoveries in Japan. The Centre for East Asian Cultural Studies and UNESCO:pp.55-71. Zhao, W., Forte, E., Levi, S. T., Pipan, M., and Tian, G., 2015, Improved high-resolution GPR imaging and characterization of prehistoric archaeological features by means of attribute analysis, Journal of Archaeological Science, 54, 77–85. A NEW MINIATURE SEISMOMETER PROTOTYPE BY NON-LINEAR ENERGY: PRELIMINARY RESULTS F. Cottone 1 , M. Ercoli 1 , M. Mattarelli 1 , A. Cannata 2 , M. Porreca 1 1 Dipartimento di Fisica e Geologia, Università degli Studi di Perugia, Italy 2 Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Università di Catania, Italy Introduction. After strong seismic events, a typical procedure is the installation of a high number of temporary seismic stations in order to improve the performances of the national permanent seismic networks. Such a densification of seismometers guarantees a better resolution in the detection of earthquakes and in their hypocentral localization. In remote areas, their installation may be logistically complex, due to the environmental characteristics of the sites, as well as to the weight of the seismometers and acquisition system. These also require to set up powering system solutions to supply the required energy for a long- term seismic monitoring. Such traditional low-frequency velocimeters are therefore heavy, expensive and not autonomous by energetic point of view. Among the different type of seismic sensors, the most used is the moving-coil geophone, that ensures a good trade-off between performances and costs (Bormann and Wielandt, 2002; Kearey et al. , 2002). Such devices show a frequency response flat above the Resonance Frequency (RFr) and minimal phase distortion within the frequency range of interest in order to preserve the shape of the seismic waveform. Therefore, geophones with a RFr well below the main frequency band of the seismic signal of interest are generally used. In passive seismology applications the most used geophones are the short-period ones (with RFr = 1 Hz). Above the RFr, the output of a moving-coil geophone is proportional to the velocity of the coil. Such a RFr depends on mass and spring stiffness that limit the scalability to small sizes due to the occurrence of high magnetic field and of a large oscillating mass. In this work we propose the implementation of a novel energy-efficient seismometer sensor which exploits non-linear effects, to shift towards lower frequencies the resonance of the oscillating mass . Method and experimental setup. The approach of this work consists on the combination of non-linear vibrational energy harvesting (VEH) techniques with sensing features in the same