7. Results and discussion
7.1. Prediction by USBM equation
The USBM equation for PPV is
v=K[R/√QMAX]-B.
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The site constants K and B can be determined by plotting the graph between the square-root-scaled distance [R/√QMAX] and PPV on log–log scale (Fig. 5). The value of K is 47.92 (101.6805) and the value of B is −0.5529.