Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes
The anomalous behavior of geomagnetic diurnal variation was reported by prior studies several months before the great 2011 Tohoku earthquake. In order to be further developed for a reliable earthquake prediction system, the statistical significance of such anomalies needs to be verified through a mu...
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Universiti Kebangsaan Malaysia
2021
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| Online Access: | http://psasir.upm.edu.my/id/eprint/95155/ |
| _version_ | 1848862084924702720 |
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| author | Yusof, Khairul Adib Abdullah, Mardina Abdul Hamid, Nurul Shazana Ahadi, Suaidi Ghamry, Essam |
| author_facet | Yusof, Khairul Adib Abdullah, Mardina Abdul Hamid, Nurul Shazana Ahadi, Suaidi Ghamry, Essam |
| author_sort | Yusof, Khairul Adib |
| building | UPM Institutional Repository |
| collection | Online Access |
| description | The anomalous behavior of geomagnetic diurnal variation was reported by prior studies several months before the great 2011 Tohoku earthquake. In order to be further developed for a reliable earthquake prediction system, the statistical significance of such anomalies needs to be verified through a multiple-events study. In this paper, 157 past earthquakes that happened from the year 2000 until 2019 around the world were studied by utilizing vast low-resolution (1-min sampling period) geomagnetic field data. The Diurnal Variation Range Ratio (DVRR) method was employed to identify the disappearance of typical diurnal variation at magnetometer stations near epicenters, whereas superposed epoch analysis was the statistical tool used to reveal the periodicity of anomaly appearances. This research found that the number of anomalies in all three geomagnetic field components (i.e., northward, eastward, and vertical) increased significantly only before the earthquakes starting from around one month prior. The significant increments were not simultaneous, instead there were temporal lags between the components. Several mechanisms were proposed to elucidate the generation of the anomalies as well as to explain the observed temporal lags. Through the analysis, it could be concluded that the statistical significance of the anomalies could be verified. It was possible that the anomalies were the earthquake precursors. |
| first_indexed | 2025-11-15T13:11:24Z |
| format | Article |
| id | upm-95155 |
| institution | Universiti Putra Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-15T13:11:24Z |
| publishDate | 2021 |
| publisher | Universiti Kebangsaan Malaysia |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | upm-951552023-02-20T01:37:19Z http://psasir.upm.edu.my/id/eprint/95155/ Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes Yusof, Khairul Adib Abdullah, Mardina Abdul Hamid, Nurul Shazana Ahadi, Suaidi Ghamry, Essam The anomalous behavior of geomagnetic diurnal variation was reported by prior studies several months before the great 2011 Tohoku earthquake. In order to be further developed for a reliable earthquake prediction system, the statistical significance of such anomalies needs to be verified through a multiple-events study. In this paper, 157 past earthquakes that happened from the year 2000 until 2019 around the world were studied by utilizing vast low-resolution (1-min sampling period) geomagnetic field data. The Diurnal Variation Range Ratio (DVRR) method was employed to identify the disappearance of typical diurnal variation at magnetometer stations near epicenters, whereas superposed epoch analysis was the statistical tool used to reveal the periodicity of anomaly appearances. This research found that the number of anomalies in all three geomagnetic field components (i.e., northward, eastward, and vertical) increased significantly only before the earthquakes starting from around one month prior. The significant increments were not simultaneous, instead there were temporal lags between the components. Several mechanisms were proposed to elucidate the generation of the anomalies as well as to explain the observed temporal lags. Through the analysis, it could be concluded that the statistical significance of the anomalies could be verified. It was possible that the anomalies were the earthquake precursors. Universiti Kebangsaan Malaysia 2021-11-30 Article PeerReviewed Yusof, Khairul Adib and Abdullah, Mardina and Abdul Hamid, Nurul Shazana and Ahadi, Suaidi and Ghamry, Essam (2021) Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes. Geografia: Malaysian journal of society and space, 17 (4). 366 - 377. ISSN 2180-2491 https://ejournal.ukm.my/gmjss/article/view/50192 10.17576/geo-2021-1704-25 |
| spellingShingle | Yusof, Khairul Adib Abdullah, Mardina Abdul Hamid, Nurul Shazana Ahadi, Suaidi Ghamry, Essam Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title | Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title_full | Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title_fullStr | Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title_full_unstemmed | Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title_short | Statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| title_sort | statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes |
| url | http://psasir.upm.edu.my/id/eprint/95155/ http://psasir.upm.edu.my/id/eprint/95155/ http://psasir.upm.edu.my/id/eprint/95155/ |