Frequency domain analysis is also done to determine the spectral capability of the smartphones to determine the significant frequency component of the explosions similar to that of seismometer. Time domain data is converted to frequency domain to compare the data from a different perspective. It can be seen that Seismometer measures the peak amplitude at 83Hz frequency as seen in Figure 5.8, on the other hand mobile phone also measures it around 75-80 Hz as seen in Figure 5.9. A Similarity is observed in the frequency domain with a nominal difference, which can be overcome by a calibrating the device which requires expert analysis of intensity measurements. The frequency analysis has shown a satisfactory result in identifying a similar trend of dominant frequency pattern compared to that of Seismometer. However,mobile phone data when compared to that of the Seismometer, the presence of noise is observed significantly in the data, this is because the fine grain data not had been collected from the smartphones during the blast without any frequency filter implemented in the design proposed, which if implemented may be limited by the computational capability of the smartphone.