Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake
The nonlinear criticality of ultra-low frequency (ULF) magnetic variations is investigated before a particular earthquake (EQ) occurred in Kobe on April 12, 2013, by applying the “natural time” analysis on a few ULF parameters: Fh, Fz and Dh. The first two refer to radiation from the lithosphere, an...
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| Format: | Article |
| Language: | English |
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Istituto Nazionale di Geofisica e Vulcanologia (INGV)
2016-07-01
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| Series: | Annals of Geophysics |
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| Online Access: | http://www.annalsofgeophysics.eu/index.php/annals/article/view/6863 |
| _version_ | 1811225321865740288 |
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| author | Stelios M. Potirakis Konstantinos Eftaxias Alexander Schekotov Hiroki Yamaguchi Masashi Hayakawa |
| author_facet | Stelios M. Potirakis Konstantinos Eftaxias Alexander Schekotov Hiroki Yamaguchi Masashi Hayakawa |
| author_sort | Stelios M. Potirakis |
| collection | DOAJ |
| description | The nonlinear criticality of ultra-low frequency (ULF) magnetic variations is investigated before a particular earthquake (EQ) occurred in Kobe on April 12, 2013, by applying the “natural time” analysis on a few ULF parameters: Fh, Fz and Dh. The first two refer to radiation from the lithosphere, and the last parameter corresponds to depression of horizontal component as a signature of ionospheric perturbation. A recent paper of our team has indicated, using the same data as in this paper but by means of conventional statistical analysis, a clear effect of depression in the horizontal component as an ionospheric signature. But there seems to be no convincing signature of lithospheric ULF radiation according to the specific analysis, so this paper aims at extending our study on the electromagnetic data recorded prior to the specific EQ by trying to find any significant phenomenon in ULF effects (both lithospheric radiation and the depression of horizontal component) using the critical, natural time analysis. The natural time analysis has yielded that criticality at Shigaraki (SGA), as the station closest to the EQ epicenter, is reached on March 27-29 for Fh and March 27 to April 1 for Fz (about two weeks before the EQ). But, the criticality for Dh was not observed at SGA probably due to high noise, on the other hand such criticality was observed at Kanoya (KNY) because of its known property of a wider range of detection of ULF depression. |
| first_indexed | 2024-04-12T09:05:07Z |
| format | Article |
| id | doaj.art-915712c83cbe43fb80f2b3cac3ef6b90 |
| institution | Directory Open Access Journal |
| issn | 1593-5213 2037-416X |
| language | English |
| last_indexed | 2024-04-12T09:05:07Z |
| publishDate | 2016-07-01 |
| publisher | Istituto Nazionale di Geofisica e Vulcanologia (INGV) |
| record_format | Article |
| series | Annals of Geophysics |
| spelling | doaj.art-915712c83cbe43fb80f2b3cac3ef6b902022-12-22T03:39:08ZengIstituto Nazionale di Geofisica e Vulcanologia (INGV)Annals of Geophysics1593-52132037-416X2016-07-0159310.4401/ag-68636088Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquakeStelios M. Potirakis0Konstantinos Eftaxias1Alexander Schekotov2Hiroki Yamaguchi3Masashi Hayakawa4Piraeus University of Applied Sciences (TEI Piraeus), Department of Electronics Engineering, Athens,University of Athens, Department of Physics, Athens,Institute of Physics of the Earth, Russian Academy of Sciences, Moscow,Fuji Security Systems Co. Ltd., Tokyo,Hayakawa Institute of Seismo Electromagnetics Co. Ltd., UEC (University of Electro-Communications), Incubation Center, Chofu Tokyo, Japan; UEC, Advanced Wireless & Communications research Center, Chofu Tokyo,The nonlinear criticality of ultra-low frequency (ULF) magnetic variations is investigated before a particular earthquake (EQ) occurred in Kobe on April 12, 2013, by applying the “natural time” analysis on a few ULF parameters: Fh, Fz and Dh. The first two refer to radiation from the lithosphere, and the last parameter corresponds to depression of horizontal component as a signature of ionospheric perturbation. A recent paper of our team has indicated, using the same data as in this paper but by means of conventional statistical analysis, a clear effect of depression in the horizontal component as an ionospheric signature. But there seems to be no convincing signature of lithospheric ULF radiation according to the specific analysis, so this paper aims at extending our study on the electromagnetic data recorded prior to the specific EQ by trying to find any significant phenomenon in ULF effects (both lithospheric radiation and the depression of horizontal component) using the critical, natural time analysis. The natural time analysis has yielded that criticality at Shigaraki (SGA), as the station closest to the EQ epicenter, is reached on March 27-29 for Fh and March 27 to April 1 for Fz (about two weeks before the EQ). But, the criticality for Dh was not observed at SGA probably due to high noise, on the other hand such criticality was observed at Kanoya (KNY) because of its known property of a wider range of detection of ULF depression.http://www.annalsofgeophysics.eu/index.php/annals/article/view/6863EarthquakeIonosphereCriticalitySeismo-electromagneticsNatural time analysisULF magnetic fields2013 Kobe EQ |
| spellingShingle | Stelios M. Potirakis Konstantinos Eftaxias Alexander Schekotov Hiroki Yamaguchi Masashi Hayakawa Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake Annals of Geophysics Earthquake Ionosphere Criticality Seismo-electromagnetics Natural time analysis ULF magnetic fields 2013 Kobe EQ |
| title | Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake |
| title_full | Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake |
| title_fullStr | Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake |
| title_full_unstemmed | Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake |
| title_short | Criticality features in ultra-low frequency magnetic fields prior to the 2013 M6.3 Kobe earthquake |
| title_sort | criticality features in ultra low frequency magnetic fields prior to the 2013 m6 3 kobe earthquake |
| topic | Earthquake Ionosphere Criticality Seismo-electromagnetics Natural time analysis ULF magnetic fields 2013 Kobe EQ |
| url | http://www.annalsofgeophysics.eu/index.php/annals/article/view/6863 |
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