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The M6.1 Banten earthquake (EQ) occurred on January 23, 2018. The EQ epicenter was in Lebak Regency, Banten. The epicenter distance from the ULF geomagnetic station installed in Banten Province is about 100 km. Applying wavelet analysis on the geomagnetic time series data, we assess the ultra-low frequency (ULF) geomagnetic anomaly related to the M6.1 Banten EQ. We focused on the frequency of 0.02 Hz for the analysis of the spectral density ratio based on wavelet. We applied the Morlet wavelet as the mother wavelet in this study. The spectral density ratio analysis based on the Morlet wavelet presents the existence of the ULF geomagnetic anomalies prior to the M6.1 Banten EQ. The global geomagnetic index, Dst, did not show any peculiarity when the anomalies prior to the EQ exist. Then, we concluded that the anomaly is possibly related to the Banten EQ.

Applying Wavelet Analysis to Assess the Ultra Low Frequency (ULF) Geomagnetic Anomalies prior to the M6.1 Banten Earthquake (2018)