GNGTS 2015 - Atti del 34° Convegno Nazionale

permitted to elaborate the z vs f 0 diagram (Fig. 2). Other boreholes intercepting the bedrock,but located in the proximity of the studied area,and boreholes, which do not reach the bedrock, were also considered to increase data, with the purpose of defining in parametric terms the empirical relationship between thickness andf 0 . In this second case, the algorithm Surface Waves of Lunedei and Albarello (2010) was take into account to compare the simulated H/V curve obtained with the software with the experimental one. Moreover, to increase data, information of sedimentary cover thickness ( z ) were also obtained from seismic reflection profiles [in the Pettino area: ������� Tallini et al. (2012) and in the proximity of WAP: Improta et al. (2012)] and by interpreting several geo-resistivity survey (GEMINA, 1963). The number of boreholes intercepting the bedrock, which were taken into account for the z vs f 0 correlation, were 10 with a variable bedrock depth ranging from 9 to 192 m; here f 0 ranges from 0.7 to 10 Hz (blue spot, a in Fig. 2). In Fig. 2 other data come from different approaches: i) ��� ��� �� �� ���� ��� ���������� ����������� ����� ��������� �� �������� ���� ��������� red dot (b in Fig. 2): presumable sedimentary cover thickness as obtained with numerical simulation by using the algorithm Surface Waves (Lunedei and Albarello, 2010); ii) ����� ��� �� �� ���� ��� �������� ������������ ������� ������� �� ��� ��������� �� ��� green dot (c in Fig. 2): borehole intercepting bedrock located in the proximity of the studied area; iii) ����� ��� �� �� ���� ��� ����������� ����� ��������� �������� �� ������� ���������� black dot (d in Fig. 2): sedimentary cover thickness inferred by seismic reflection investigations in the Pettino area (Tallini et al. , 2012) and in an area located southeastwards of WAP in its proximity (Improta et al. , 2012). The obtained relationship is as follows: z = 129.3 · f -1.06 (1) where the constants a and b are 129.3 and -1.06, respectively, and the coefficient R 2 is quite high (0.73), evidencing a good fit of data. Moreover the obtained constants a and b are quite similar to others from literature (e.g., Gosar and Lenart, 2010; D’Amico et al. , 2008). Fig. 2 – Quaternary sedimentary cover thickness ( z ) vs resonance frequency ( f 0 ) diagram. a: boreholes intercepting bedrock (data: 10); b: presumable sediment thickness as obtained with numerical simulations (data: 9); c: boreholes intercepting bedrock located in the proximity of the studied area (data: 8); d: Quaternary sedimentary cover thickness inferred by seismic reflection investigations in the Pettino area (Tallini et al ., 2012) and in an area located in the proximity of WAP (Improta et al. , 2012) (data: 8). 84 GNGTS 2015 S essione 2.2