Preprints
https://doi.org/10.21203/rs.3.rs-3506121/v1
https://doi.org/10.21203/rs.3.rs-3506121/v1
20 Feb 2024
 | 20 Feb 2024
Status: this preprint is open for discussion.

Investigation of geomagnetic field variations in search of seismo-electromagnetic emissions associated with earthquakes in subduction zone of Andaman-Nicobar, India

Rahul Prajapati and Kusumita Arora

Abstract. The study of seismo-electromagnetic (EM) emissions has the potential to provide new insights into the physics of seismic activity and improve our ability to monitor and predict earthquakes and other geophysical events. Continuous recording and monitoring of EM fields in seismically active areas are very complex, but it can open a new regime in the field of earthquake prediction. In this study, one year of ground based geomagnetic data during March 2019 to April 2020 in seismic active subduction zone of Andaman-Nicobar region in search of EM signatures related to lithospheric processes. An anomalous signature in the vertical component of geomagnetic field is preferred to study after removing the global and seasonal effect from the data. Apart from vertical component of geomagnetic field, polarization ratios which also include horizontal component, also studied from spectral density with the same purpose in ULF range. Over the duration of one year, we noted an 80 % enhancement in polarisation ratios and 67 % deviations in diurnal ratios average 18 days before of earthquake events. Apart from that, the significant enhancements in diurnal and polarization ratio were shown to be successfully correlated with 11 out of 14 earthquakes which is equivalent to approximately 78 % success ratio.

Rahul Prajapati and Kusumita Arora

Status: open (until 17 Apr 2024)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2024-177', Anonymous Referee #1, 12 Mar 2024 reply
  • RC2: 'Comment on egusphere-2024-177', Anonymous Referee #2, 12 Apr 2024 reply
Rahul Prajapati and Kusumita Arora
Rahul Prajapati and Kusumita Arora

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Short summary
The enhancement or anomalies in the geomagnetic field from the very seismically active region of Andaman-Nicobar observed in the diurnal ratio (DR) and polarization ratio (PR) indicate EM signatures from pre-processes of earthquakes in lithosphere. The significant enhancements show the success rate of around 78 % and an average of 18 days prior to the earthquake. A long-term data and more stations may provide more insights in physical processes of Earth’s subsurface, and range of detectability.