On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event
In this paper, we report high statistical evidence for a seismo–ionosphere effects occurring in conjunction with an earthquake. This finding supports a lithosphere-magnetosphere coupling mechanism producing a plasma density variation along the magnetic field lines, mechanically produced by atmospher...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-07-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/14/2839 |
| _version_ | 1827686954102161408 |
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| author | Mirko Piersanti William Jerome Burger Vincenzo Carbone Roberto Battiston Roberto Iuppa Pietro Ubertini |
| author_facet | Mirko Piersanti William Jerome Burger Vincenzo Carbone Roberto Battiston Roberto Iuppa Pietro Ubertini |
| author_sort | Mirko Piersanti |
| collection | DOAJ |
| description | In this paper, we report high statistical evidence for a seismo–ionosphere effects occurring in conjunction with an earthquake. This finding supports a lithosphere-magnetosphere coupling mechanism producing a plasma density variation along the magnetic field lines, mechanically produced by atmospheric acoustic gravity waves (AGWs) impinging the ionosphere. We have analysed a large sample of earthquakes (EQ) using ground magnetometers data: in 28 of 42 analysed case events, we detect a temporary stepwise decrease (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><mi>f</mi></mrow></semantics></math></inline-formula>) of the magnetospheric field line resonance (FLR) eigenfrequency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>f</mi><mo>*</mo></msup></semantics></math></inline-formula>). <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><mi>f</mi></mrow></semantics></math></inline-formula> decreases of ∼5–25 mHz during ∼20–35 min following the time of the EQ. We present an analytical model for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>f</mi><mo>*</mo></msup></semantics></math></inline-formula>, able to reproduce the behaviour observed during the EQ. Our work is in agreement with recent results confirming co-seismic direct coupling between lithosphere, ionosphere and magnetosphere opening the way to new remote sensing methods, from space/ground, of the earth seismic activity. |
| first_indexed | 2024-03-10T09:24:56Z |
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| id | doaj.art-a5e78ff8ef76421fbde7b69c893a2abb |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T09:24:56Z |
| publishDate | 2021-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-a5e78ff8ef76421fbde7b69c893a2abb2023-11-22T04:53:11ZengMDPI AGRemote Sensing2072-42922021-07-011314283910.3390/rs13142839On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic EventMirko Piersanti0William Jerome Burger1Vincenzo Carbone2Roberto Battiston3Roberto Iuppa4Pietro Ubertini5INAF-IAPS, Via del Fosso del Cavaliere, 00133 Rome, ItalyTrento Institute for Fundamental Physics and Applications (TIFPA), Via Sommarive, Povo, 38122 Trento, ItalyPhysics Department, Universitá della Calabria, Ponte Pietro Bucci, Rende, 87036 Cosenza, ItalyTrento Institute for Fundamental Physics and Applications (TIFPA), Via Sommarive, Povo, 38122 Trento, ItalyTrento Institute for Fundamental Physics and Applications (TIFPA), Via Sommarive, Povo, 38122 Trento, ItalyINAF-IAPS, Via del Fosso del Cavaliere, 00133 Rome, ItalyIn this paper, we report high statistical evidence for a seismo–ionosphere effects occurring in conjunction with an earthquake. This finding supports a lithosphere-magnetosphere coupling mechanism producing a plasma density variation along the magnetic field lines, mechanically produced by atmospheric acoustic gravity waves (AGWs) impinging the ionosphere. We have analysed a large sample of earthquakes (EQ) using ground magnetometers data: in 28 of 42 analysed case events, we detect a temporary stepwise decrease (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><mi>f</mi></mrow></semantics></math></inline-formula>) of the magnetospheric field line resonance (FLR) eigenfrequency (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>f</mi><mo>*</mo></msup></semantics></math></inline-formula>). <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>Δ</mo><mi>f</mi></mrow></semantics></math></inline-formula> decreases of ∼5–25 mHz during ∼20–35 min following the time of the EQ. We present an analytical model for <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mi>f</mi><mo>*</mo></msup></semantics></math></inline-formula>, able to reproduce the behaviour observed during the EQ. Our work is in agreement with recent results confirming co-seismic direct coupling between lithosphere, ionosphere and magnetosphere opening the way to new remote sensing methods, from space/ground, of the earth seismic activity.https://www.mdpi.com/2072-4292/13/14/2839earthquakecoseismic effectsfield line resonanceacoustic gravity waveslithosphere-magnetosphere coupling |
| spellingShingle | Mirko Piersanti William Jerome Burger Vincenzo Carbone Roberto Battiston Roberto Iuppa Pietro Ubertini On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event Remote Sensing earthquake coseismic effects field line resonance acoustic gravity waves lithosphere-magnetosphere coupling |
| title | On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event |
| title_full | On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event |
| title_fullStr | On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event |
| title_full_unstemmed | On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event |
| title_short | On the Geomagnetic Field Line Resonance Eigenfrequency Variations during Seismic Event |
| title_sort | on the geomagnetic field line resonance eigenfrequency variations during seismic event |
| topic | earthquake coseismic effects field line resonance acoustic gravity waves lithosphere-magnetosphere coupling |
| url | https://www.mdpi.com/2072-4292/13/14/2839 |
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