The optimum frequency for detecting earthquake precursors based on ultra-low frequency (ULF) geomagnetic data from Sukabumi (SKB) station

Dewi, Cinantya Nirmala; Febriani, Febty; Anggono, Titi; Syuhada, Syuhada; Hasib, Mohammad; Prasetio, Aditya Dwi; Sulaiman, Albertus; Suprihatin, Hendra Suwarta; Ahadi, Suaidi; Syirojudin, Muhamad; Hasanudin, Hasanudin; Marsyam, Indah

doi:10.1063/5.0106349

The International Conference on Advanced Material and Technology (Icamt) 2021

2022

DOI: 10.1063/5.0106349

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The optimum frequency for detecting earthquake precursors based on ultra-low frequency (ULF) geomagnetic data from Sukabumi (SKB) station

Cinantya Nirmala Dewi¹,

Febty Febriani²,

Titi Anggono³

et al.

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2024

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Fast Fourier Transform (FFT) Application For Short-Term Earthquake Precursor Analysis Using Geomagnetic Data (Case Study of Kupang Geomagnetic Station, East Nusa Tenggara, Indonesia)

Utami,

Febriani,

Irayani

et al. 2024

J. Phys.: Conf. Ser.

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Earthquake (EQ) precursors have been identified from ULF geomagnetic enhancements related to a moderate EQ in Kupang, East Nusa Tenggara, Indonesia. Three components of geomagnetic data (X, Y, and Z) collected during January-June 2010 were analyzed. The EQ occurred on May 7, 2010, and its epicenter was 27.78 km from the KPG Geomagnetic Station. The magnitude and depth of the EQ were 5 and 11.3 km, respectively. This study investigated the energy of ULF geomagnetic signals in the frequency range of 0.03 to 0.04 Hz using SDR based on FFT. The results showed that the geomagnetic energy increased approximately three days before the EQ. Due to the significant magnitude and relative proximity of the EQ to the observation station, it can be concluded that the closer the geomagnetic station from the EQ source, the more likely it is to detect anomalies caused by the EQ. Despite the increase in geomagnetic energy, the Dst index which measures the global activity of the geomagnetic variation in low-latitude regions does not indicate any extraordinary global geomagnetic activity. This indicates that geomagnetic anomalies are most likely related to EQ events.

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Fast Fourier Transform (FFT) Application For Short-Term Earthquake Precursor Analysis Using Geomagnetic Data (Case Study of Kupang Geomagnetic Station, East Nusa Tenggara, Indonesia)

Utami,

Febriani,

Irayani

et al. 2024

J. Phys.: Conf. Ser.

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show abstract

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The optimum frequency for detecting earthquake precursors based on ultra-low frequency (ULF) geomagnetic data from Sukabumi (SKB) station

Cited by 1 publication

References 19 publications

Fast Fourier Transform (FFT) Application For Short-Term Earthquake Precursor Analysis Using Geomagnetic Data (Case Study of Kupang Geomagnetic Station, East Nusa Tenggara, Indonesia)

Fast Fourier Transform (FFT) Application For Short-Term Earthquake Precursor Analysis Using Geomagnetic Data (Case Study of Kupang Geomagnetic Station, East Nusa Tenggara, Indonesia)

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