Main characteristics for three explosion events based on explosion waves

The three explosion events recorded by Mudanjiang and Baijitong sesimic stations on October 9, 2006, May 25, 2009 and Feburary 12, 2013 were analyzed, respectively.Both the stations belong to Global Sesimic Network.The energy ratios of the three events were estimated by comparing the maximum P-phase amplitudes and the power spectrum densities, and the correlation coefficients of the three explosion events were determined.The phases were compared to determine the relative location of these explosion events.Comparison between the 2013 event and the 2009 event displays that the mean ratios of the maximum amplitudes and the power spectrum densities are about 2.3 and 2.7, respectively.The results for the 2013 event and the 2006 event displays that the mean ratio of the maximum amplitudes is about 10.1 and the mean ratio of the power spectrum densities is about 13.5.It indicates that the energy released by the 2013 event is about 11.8 times as much as that released by the 2006 event and 2.5 times as much as that released by the 2009 event.The maximum cross correlations were 0.90 and 0.99 for the 2013, 2006 events and the 2013, 2009 events in 2-4 Hz, respectively.These results mean that the 2013 event is highly correlated to the 2006 and 2009 events in the frequency band which the main energy concentrated, and this shows that the relative distances of the three events are not long.The analysis on the relative locations of these three events can explain that the 2013 event lies to the southeast of the 2009 events.