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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Detection of low-frequency earthquakes by the matched filter technique using the product of mutual information and correlation coefficient

Fig. 4

a–b Scatter plots of detection using a waveform comprising a DLF earthquake signal with Gaussian noise at SN ratios of (a) 0.2 and (b) 1.0. A given time step represents each sample of velocity data in the 8-s time window (25 Hz sampling rate). Scatter plots (top panels) compare the amplitude of the template waveform with the amplitude of the target data at each time step. Bottom panels show the waveforms of the target data and template waveform at that time. c The three indices (MI, CC, and MICC) plotted with respect to the SN ratio of the waveform

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