## 6 Results and Discussion  
The measured V\({}_{\rm s}\) values and the estimated V\({}_{\rm s}\) values according to Equation (2) are compared in Figure 9. The values obtained as a result of the comparison are distributed between the 1:0.5 and 1:2 slopes, and the V\({}_{\rm s}\) values between 150 and 250 m/s are concentrated in the 1:1 line frame. Based on the comparison for sandy soils, the resulting equations obtained by [PERSON] [22] and [PERSON] [32] gave similar results to the V\({}_{\rm s}\) values obtained in this study at certain blow-count intervals (Figure 10). In the equation proposed by [PERSON] [22], V\({}_{\rm s}\) values similar to those in this study were obtained for the number of impacts 30 \(\leq\) N \(\leq\) 40, while higher V\({}_{\rm s}\) values were obtained for N < 30 than the V\({}_{\rm s}\) values obtained from this study, and lower V\({}_{\rm s}\) values were obtained for 40 < N. However, in the equation proposed by [PERSON] [32], V\({}_{\rm s}\) values similar to those in this study were obtained for N \(\leq\) 15, while lower V\({}_{\rm s}\) values were obtained for 15 < N than the V\({}_{\rm s}\) values obtained in this study (Figure 10). Moreover, when the equation proposed by [PERSON] et al. [33] was compared with the equation obtained in this study, the equations gave close results, and the data distribution was similar (Figure 10). These differences between the correlation results could be due to the different soil conditions in the study areas, the number of data points used, the SPT applications, and the different V\({}_{\rm S}\) measurement methods used in the studies. Figure 10: Comparison of previous studies consistent with this study for V\({}_{\rm s}\) and SPT-N [22; 32; 33]. Figure 9: Graph of the measured, versus estimated, shear wave velocity for sandy alluvial soil. In addition to the comparison of previous studies consistent with this study for sandy soil given in Figure 10, the scale error percentage (Equation (5)) and cumulative frequency graphs are also given in Figure 11.  
\[\text{Scaled percent error}=\left[\frac{V_{sc}-V_{sm}}{V_{sm}}\right]\times 100 \tag{5}\]  
where \(V_{sc}\) and \(V_{sm}\) are the predicted and measured shear wave velocities, respectively. As can be seen in Figure 11, approximately 70% of the \(\text{V}_{\text{s}}\) values predicted via Equation (2) are within 20% of the scaled percent error. This indicates a slightly higher prediction than 67% obtained via Equation (2). When the correlation coefficient between \(\text{V}_{\text{s}}\) and \(\text{N}_{\text{60}}\) is compared with Equation (2), the correlation coefficient obtained with the uncorrected SPT-N had a slightly better value than the energy-corrected correlation coefficient. The measured \(\text{V}_{\text{s}}\) values and the \(\text{V}_{\text{s}}\) values estimated according to Equation (4) are compared in Figure 12. Based on the comparison, the data were distributed between a 1:05 and 1:2 slope and the \(\text{V}_{\text{s}}\) values between 175 and 250 m/s were concentrated along the 1:1 line. Figure 11: Scaled percentage error of the \(\text{V}_{\text{s}}\) values estimated for sandy soils [22; 32; 33]. Figure 12: Graph of the estimated, versus measured, shear wave velocity, using SPT-\(\text{N}_{\text{60}}\). The equation between \(\rm V_{s}\) and \(\rm N_{60}\) given in Equation (4) was compared with the regression correlations for sandy soils in Figure 13. Based on the comparison, the equations obtained by [PERSON] et al. [54] and [PERSON] and [PERSON] [29] provided similar results to the \(\rm V_{s}\) values obtained in this study at certain blow-count intervals. The \(\rm V_{s}\) values obtained with the equation proposed by [PERSON] et al. [54] and [PERSON] and [PERSON] [29] for the number of pulses \(\rm N_{60}\) < 27 were larger than the \(\rm V_{s}\) values obtained in this study. For 27 \(\leq\rm N_{60}\leq\) 32, the equations by [PERSON] et al. [54] and [PERSON] and [PERSON] [29] yielded similar results to the \(\rm V_{s}\) values obtained in this study.