Articles | Volume 32, issue 1
https://doi.org/10.5194/npg-32-1-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/npg-32-1-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
07 Jan 2025
Research article |
| 07 Jan 2025
| 07 Jan 2025
Fractal analysis of geomagnetic data to decipher pre-earthquake processes in the Andaman–Nicobar region, India
Rahul Prajapati
CORRESPONDING AUTHOR
Geomagnetism Group, CSIR-National Geophysical Research Institute, Hyderabad 500007, India
Kusumita Arora
Geomagnetism Group, CSIR-National Geophysical Research Institute, Hyderabad 500007, India
Related authors
Rahul Prajapati and Kusumita Arora
EGUsphere, https://doi.org/10.21203/rs.3.rs-3506121/v1, https://doi.org/10.21203/rs.3.rs-3506121/v1, 2024
Preprint archived
Short summary
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.
Rahul Prajapati and Kusumita Arora
EGUsphere, https://doi.org/10.21203/rs.3.rs-3506121/v1, https://doi.org/10.21203/rs.3.rs-3506121/v1, 2024
Preprint archived
Short summary
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.
Nelapatla Phani Chandrasekhar, Sai Vijay Kumar Potharaju, Kusumita Arora, Chandra Shakar Rao Kasuba, Leonid Rakhlin, Sergey Tymoshyn, Laszlo Merenyi, Anusha Chilukuri, Jayashree Bulusu, and Sergey Khomutov
Geosci. Instrum. Method. Data Syst., 6, 547–560, https://doi.org/10.5194/gi-6-547-2017, https://doi.org/10.5194/gi-6-547-2017, 2017
Short summary
Short summary
This work presents the progressive steps which led to the successful setup of such measurements at the new magnetic observatory in Choutuppal (CPL) of CSIR-NGRI, Hyderabad, India. Iterative tuning of the setup led to the generation of good quality data from 2016 onward. The processes of commissioning this setup in low-latitude conditions, with the aim of producing 1 s definitive data, and the characteristics of the data from this new instrument are presented here.
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Short summary
Seismo-electromagnetic (SEM) signals emitted prior to major earthquakes show promise as candidates for short-term earthquake prediction. Analyzing the frequency characteristics of SEM signals provides insights into pre-earthquake processes in the focal zone, such as microfracturing and electrokinetic phenomena. The combined application of fractal and multifractal methods proves to be an effective tool for analyzing these complex signals.
Seismo-electromagnetic (SEM) signals emitted prior to major earthquakes show promise as...
