Assessment of signal processing methods for geomagnetic precursor of the 2012 M6.9 Visayas, Philippines earthquake

• Autorzy: Yusof Khairul Adib , Hamid Nurul Shazana Abdul , Abdullah Mardina , Ahadi Suaidi , Yoshikawa Akimasa

Identyfikatory

DOI

10.1007/s11600-019-00319-w

• Języki publikacji: EN

Abstrakty

EN

This study assessed two signal processing methods on geomagnetic data to detect precursory signals appearing before the M6.9 Visayas, Philippines earthquake on 6 February 2012. It aimed to compare the polarization ratio analysis method with the diurnal variation ratio method in terms of reliability and efectiveness. The geomagnetic data were obtained from the MAGDAS magnetometer network for Cebu (CEB) and Legazpi (LGZ) stations which served as the primary and remote stations, respectively. The polarization ratio analysis method was performed on the primary station data to obtain power spectral density in an ultra-low-frequency range before fnding the ratio of vertical to total horizontal component. Meanwhile, the diurnal variation ratio method was used to calculate the diference between the daily maximum and minimum values. Then, the ratio of the daily diferences of the primary station to the remote station for each individual component was calculated. The disturbance storm time index which describes global geomagnetic activity originating from the Sun was utilized to verify that any observed geomagnetic fuctuations were not caused by solar-terrestrial efect. A precursory anomaly was found using the polarization ratio analysis method which appeared 2 weeks before the earthquake. It is concluded that this method might be efective and reliable in detecting geomagnetic anomalies preceding upcoming earthquakes. In contrast, although the diurnal variation ratio method did show perceivable fuctuations, the running averages were not statistically significant to be considered a precursor. The discrepancy between the analytical results of the two methods may be attributed to the detectability of the earthquake being studied which had a relatively low magnitude. Hence, future studies which utilize more earthquake events need to be conducted to reach a definitive conclusion.

Słowa kluczowe

EN

geomagnetic field; Philippines; polarization ratio analysis; diurnal variation ratio; earthquake precursor

PL

pole geomagnetyczne; Filipiny; analiza współczynnika polaryzacji

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2019
• Tom: Vol. 67, no. 5
• Strony: 1297--1306
• Opis fizyczny: Bibliogr. 28 poz.

Twórcy

autor

Yusof Khairul Adib

• Space Science Centre, Institute of Climate Change, Universiti Kebangsaan Malaysia, Selangor, Malaysia
• Department of Physics, Faculty of Science, Universiti Putra Malaysia, ‎Selangor, Malaysia

autor

Hamid Nurul Shazana Abdul

• Space Science Centre, Institute of Climate Change, Universiti Kebangsaan Malaysia, Selangor, Malaysia
• School of Applied Physics, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, ‎Selangor, Malaysia

autor

Abdullah Mardina

• Space Science Centre, Institute of Climate Change, Universiti Kebangsaan Malaysia, Selangor, Malaysia
• Centre of Advanced Electronic and Communication Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, ‎Selangor, Malaysia

autor

Ahadi Suaidi

• Department of Geophysics, Indonesian Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia

autor

Yoshikawa Akimasa

• International Center for Space Weather Science and Education, Kyushu University, Fukuoka 812-8581, Japan

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).