The idea of running the KSigma algorithm on the filtered data seemed promising after seeing the plots in the previous blog. But, what we did not realize all this while was that, if the algorithm was picking better in the quake time, it would pick better on the quiet time too. We were basically enhancing the frequencies that distinguish the quiet time from the quake time, that seemed like the reason why there were more picks in the quiet time.
Below is a plot showing this effect. The top sub plot is the original data from the SAC file. The two blue lines are the TauP estimations of the P and S wave arrival times, the first is for the P wave and the second is for the S wave.
Quiet time picking
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