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Electromagnetic anomalies detection over seismic regions during an earthquake
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<p><span>The definition of the statistical distribution of the ionospheric electromagnetic (EM) waves energy </span><span>in absence of seismic activity and other anomalous inputs (such as the ones derived by solar </span><span>forcing) is a necessary step in order to determine a background in the ionospheric EM emissions </span><span>over seismic regions. An EM signal which differs from the background (exceeding a statistically </span><span>meaningful threshold) should be considered as a potential event to be investigated. </span><span>In this work, by means of the FIF (Fast Iterative Filtering) data analysis technique, we performed </span><span>a</span> <span>multiscale</span> <span>analysis</span> <span>of</span> <span>the</span> <span>ionospheric</span> <span>environmental</span> <span>background,</span> <span>using</span> <span>almost</span> <span>the</span> <span>entire </span><span>CSES01 (China Seismo-ElectroMagnetic Satellite) electric and magnetic field dataset (2019 - </span><span>2021), by creating the map of the averaged relative energy (</span><span>&#949;</span><sub><span>rel</span></sub><span>) over a 3&#176; x 3&#176; latitude-longitude </span><span>cell, depending on both spatial and temporal scale of the ionospheric medium.</span><br><span>In</span> <span>order</span> <span>to</span> <span>make</span> <span>a</span> <span>robust</span> <span>discrimination</span> <span>between</span> <span>external</span> <span>(atmospheric,</span> <span>ionospheric, </span><span>magnetospheric,</span> <span>solar</span> <span>activities)</span> <span>and</span> <span>internal</span> <span>(earthquakes,</span> <span>volcanoes)</span> <span>sources</span> <span>generating </span><span>anomalous signals, we took into account geomagnetic activity conditions in terms of the Sym-H </span><span>index.</span><br><span>Here we present the results obtained for the August 14, 2021 Haitian earthquake (</span><span>7</span><span>.</span><span>2</span> <span>M</span><sub><span>W</span></sub><span>) and </span><span>the September 27, 2021 Crete (Greece) earthquake (</span><span>6</span><span>.</span><span>0</span> <span>M</span><span><sub>W</sub>).</span>&#160;</p>
Title: Electromagnetic anomalies detection over seismic regions during an earthquake
Description:
<p><span>The definition of the statistical distribution of the ionospheric electromagnetic (EM) waves energy </span><span>in absence of seismic activity and other anomalous inputs (such as the ones derived by solar </span><span>forcing) is a necessary step in order to determine a background in the ionospheric EM emissions </span><span>over seismic regions.
An EM signal which differs from the background (exceeding a statistically </span><span>meaningful threshold) should be considered as a potential event to be investigated.
</span><span>In this work, by means of the FIF (Fast Iterative Filtering) data analysis technique, we performed </span><span>a</span> <span>multiscale</span> <span>analysis</span> <span>of</span> <span>the</span> <span>ionospheric</span> <span>environmental</span> <span>background,</span> <span>using</span> <span>almost</span> <span>the</span> <span>entire </span><span>CSES01 (China Seismo-ElectroMagnetic Satellite) electric and magnetic field dataset (2019 - </span><span>2021), by creating the map of the averaged relative energy (</span><span>&#949;</span><sub><span>rel</span></sub><span>) over a 3&#176; x 3&#176; latitude-longitude </span><span>cell, depending on both spatial and temporal scale of the ionospheric medium.
</span><br><span>In</span> <span>order</span> <span>to</span> <span>make</span> <span>a</span> <span>robust</span> <span>discrimination</span> <span>between</span> <span>external</span> <span>(atmospheric,</span> <span>ionospheric, </span><span>magnetospheric,</span> <span>solar</span> <span>activities)</span> <span>and</span> <span>internal</span> <span>(earthquakes,</span> <span>volcanoes)</span> <span>sources</span> <span>generating </span><span>anomalous signals, we took into account geomagnetic activity conditions in terms of the Sym-H </span><span>index.
</span><br><span>Here we present the results obtained for the August 14, 2021 Haitian earthquake (</span><span>7</span><span>.
</span><span>2</span> <span>M</span><sub><span>W</span></sub><span>) and </span><span>the September 27, 2021 Crete (Greece) earthquake (</span><span>6</span><span>.
</span><span>0</span> <span>M</span><span><sub>W</sub>).
</span>&#160;</p>.
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