Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes
In this study, we improved and adapted existing signal processing methods on vast geomagnetic field data to investigate the correlations between various earthquake properties and characteristics of possible geomagnetic precursors. The data from 10 magnetometer stations were utilized to detect precur...
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| author | Khairul Adib Yusof Mardina Abdullah Nurul Shazana Abdul Hamid Suaidi Ahadi Akimasa Yoshikawa |
| author_facet | Khairul Adib Yusof Mardina Abdullah Nurul Shazana Abdul Hamid Suaidi Ahadi Akimasa Yoshikawa |
| author_sort | Khairul Adib Yusof |
| collection | DOAJ |
| description | In this study, we improved and adapted existing signal processing methods on vast geomagnetic field data to investigate the correlations between various earthquake properties and characteristics of possible geomagnetic precursors. The data from 10 magnetometer stations were utilized to detect precursory ultra-low frequency emission and estimate the source direction for 34 earthquakes occurring between the year 2007–2016 in Southeast Asia, East Asia, and South America regions. As a result, possible precursors of 20 earthquakes were identified (58.82% detection rate). Weak correlations were obtained when all precursors were considered. However, statistically significant and strong linear correlations (<inline-formula><math display="inline"><semantics><mrow><mi>r</mi><mtext> </mtext><mo>≥</mo><mtext> </mtext><mn>0.60</mn><mo>,</mo><mtext> </mtext><mi>p</mi><mtext> </mtext><mo><</mo><mtext> </mtext><mn>0.05</mn></mrow></semantics></math></inline-formula>) were found when the precursors from two closely located stations in Japan (Onagawa (ONW) and Tohno (TNO)) were exclusively investigated. For these stations, it was found that the lead time of the precursor is strongly (or very strongly) correlated with the earthquake magnitude, the local seismicity index, and the hypocentral depth. In addition, the error percentage of the estimated direction showed a strong correlation with the hypocentral depth. It is concluded that, when the study area is restricted to a specific location, the earthquake properties are more likely to have correlations with several characteristics of the possible precursors. |
| first_indexed | 2024-03-09T04:18:43Z |
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| issn | 2218-1997 |
| language | English |
| last_indexed | 2024-03-09T04:18:43Z |
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| series | Universe |
| spelling | doaj.art-270bd00b08aa4e7a85b6706f37ae3b522023-12-03T13:50:00ZengMDPI AGUniverse2218-19972021-01-01712010.3390/universe7010020Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple EarthquakesKhairul Adib Yusof0Mardina Abdullah1Nurul Shazana Abdul Hamid2Suaidi Ahadi3Akimasa Yoshikawa4Space Science Center, Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi 43600, MalaysiaSpace Science Center, Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi 43600, MalaysiaSpace Science Center, Institute of Climate Change, Universiti Kebangsaan Malaysia, Bangi 43600, MalaysiaDepartment of Geophysics, Indonesian Agency for Meteorology, Climatology and Geophysics, Jakarta 10610, IndonesiaInternational Center for Space Weather Science and Education, Kyushu University, Fukuoka 812-8581, JapanIn this study, we improved and adapted existing signal processing methods on vast geomagnetic field data to investigate the correlations between various earthquake properties and characteristics of possible geomagnetic precursors. The data from 10 magnetometer stations were utilized to detect precursory ultra-low frequency emission and estimate the source direction for 34 earthquakes occurring between the year 2007–2016 in Southeast Asia, East Asia, and South America regions. As a result, possible precursors of 20 earthquakes were identified (58.82% detection rate). Weak correlations were obtained when all precursors were considered. However, statistically significant and strong linear correlations (<inline-formula><math display="inline"><semantics><mrow><mi>r</mi><mtext> </mtext><mo>≥</mo><mtext> </mtext><mn>0.60</mn><mo>,</mo><mtext> </mtext><mi>p</mi><mtext> </mtext><mo><</mo><mtext> </mtext><mn>0.05</mn></mrow></semantics></math></inline-formula>) were found when the precursors from two closely located stations in Japan (Onagawa (ONW) and Tohno (TNO)) were exclusively investigated. For these stations, it was found that the lead time of the precursor is strongly (or very strongly) correlated with the earthquake magnitude, the local seismicity index, and the hypocentral depth. In addition, the error percentage of the estimated direction showed a strong correlation with the hypocentral depth. It is concluded that, when the study area is restricted to a specific location, the earthquake properties are more likely to have correlations with several characteristics of the possible precursors.https://www.mdpi.com/2218-1997/7/1/20earthquake precursorgeomagnetic ultra-low frequency (ULF)polarization ratio analysispolarization ellipse |
| spellingShingle | Khairul Adib Yusof Mardina Abdullah Nurul Shazana Abdul Hamid Suaidi Ahadi Akimasa Yoshikawa Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes Universe earthquake precursor geomagnetic ultra-low frequency (ULF) polarization ratio analysis polarization ellipse |
| title | Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes |
| title_full | Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes |
| title_fullStr | Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes |
| title_full_unstemmed | Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes |
| title_short | Correlations between Earthquake Properties and Characteristics of Possible ULF Geomagnetic Precursor over Multiple Earthquakes |
| title_sort | correlations between earthquake properties and characteristics of possible ulf geomagnetic precursor over multiple earthquakes |
| topic | earthquake precursor geomagnetic ultra-low frequency (ULF) polarization ratio analysis polarization ellipse |
| url | https://www.mdpi.com/2218-1997/7/1/20 |
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