| Autor: |
Dewi, Cinantya Nirmala, Febriani, Febty, Anggono, Titi, Syuhada, Prasetio, Aditya Dwi, Hasib, Mohammad, Sulaiman, Albertus, Suprihatin, Hendra Suwarta, Ahadi, Suaidi, Syirojudin, Muhamad, Hasanudin, Marsyam, Indah |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2023, Vol. 2554 Issue 1, p1-7, 7p |
| Abstrakt: |
A study on ultra-low frequency (ULF) geomagnetic anomaly was carried out for the M5.9 Banten earthquake on January 23, 2018. The time-domain of geomagnetic data on X, Y, and Z components obtained from the Banten (BTN) geomagnetic station was processed by Fast Fourier Transform (FFT) and Wavelet Transform (WT) method to obtain information from signals in the frequency domain. Two polarization ratio analyses (PRA), i.e. classic PRA and normalized PRA, were used to analyze its effectiveness in detecting earthquake precursors. We compared the results of the classic PRA and normalized PRA with the Dst value to ensure that no magnetic storms were occurring during the analyzed period. The results showed that the ULF anomaly appeared consistently on January 17, 2018, from both the classic PRA and the normalized PRA results when there were no magnetic storms. We indicated this ULF anomaly as a precursor of the M5.9 earthquake. The normalization process that was carried out made the anomaly clearer and more significant than the classic PRA which still displayed ambiguous precursors. Therefore, we propose that the normalized PRA is more powerful for detecting the probable earthquake precursors and eliminating ambiguous precursors compared to classic PRA. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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