After fixing the source location of the explosion in all we emplaced smartphones (denoted by PI. P2 experiments and P4) at multiple distances from the source as highlighted in Table I. and shown pictorially in Figure 2. The explosion experiments in the laboratory were conducted in identical environmental conditions and explosive material. Figure 2 hows the layout of the phones during 4 explosion experiments with different intensities As seen from the figure, we used multiple smartphones placed at various distances from the source to collect data-sets