Ambient Seismic Noise Analysis Associated with the 2010 Eruption of Merapi Volcano Using Temporal Variations of Randomness and Background Noise

Figure 7

The results of moving standard deviation calculation against PE values of HOT14 and HOT23 broadband stations [11]. The decrease in standard deviation is seen in the calculation results for both stations. The randomness of the signal about eight days before the Mw ~5.6 earthquake was stable at low values.