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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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Main Authors: Yusof, Khairul Adib, Abdullah, Mardina, Abdul Hamid, Nurul Shazana, Ahadi, Suaidi, Ghamry, Essam
Format: Article
Published: Universiti Kebangsaan Malaysia 2021
Online Access:http://psasir.upm.edu.my/id/eprint/95155/
https://ejournal.ukm.my/gmjss/article/view/50192
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spelling my.upm.eprints.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
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
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.
format Article
author Yusof, Khairul Adib
Abdullah, Mardina
Abdul Hamid, Nurul Shazana
Ahadi, Suaidi
Ghamry, Essam
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
author_facet Yusof, Khairul Adib
Abdullah, Mardina
Abdul Hamid, Nurul Shazana
Ahadi, Suaidi
Ghamry, Essam
author_sort Yusof, Khairul Adib
title 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_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_sort statistical significance of geomagnetic diurnal variation anomalies prior to worldwide earthquakes
publisher Universiti Kebangsaan Malaysia
publishDate 2021
url http://psasir.upm.edu.my/id/eprint/95155/
https://ejournal.ukm.my/gmjss/article/view/50192
_version_ 1758952024531009536
score 13.211869

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