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Simultaneous electric, magnetic and ULF anomalies associated with moderate earthquakes in Kumaun Himalaya

Author

Listed:
  • Jayashree Bulusu

    (CSIR-National Geophysical Research Institute
    Indian Institute of Geomagnetism)

  • Kusumita Arora

    (CSIR-National Geophysical Research Institute)

  • Shubham Singh

    (CSIR-National Geophysical Research Institute)

  • Anusha Edara

    (CSIR-National Geophysical Research Institute)

Abstract

Variations in electric and magnetic (EM) fields were examined at two sites: Dhanachuli near the Main Boundary Thrust (MBT) and Patiyasar near the Main Central Thrust (MCT) in Kumaun Himalaya, India. Anomalous EM signatures are defined based on medium-term data recordings. The patterns of anomalous EM signatures are then linked to the occurrence of moderate earthquakes (3.5 ≤ M ≤ 5.0), enhanced along the MCT. The vertical component of the magnetic field is due to microtremors prior to the earthquakes; electric fields also show positive anomalies. Surface waves due to microtemors associated with the earthquakes is reflected in the polarization ratios of geomagnetic data in the Pc4 range (0.01 Hz), a few days prior to each earthquake. In the case of one earthquake, during which suitable data could be retrieved, we observe a frequency change in ULF (Pc1 range) in addition to the enhancement of the Pc4, prior to the event.

Suggested Citation

  • Jayashree Bulusu & Kusumita Arora & Shubham Singh & Anusha Edara, 2023. "Simultaneous electric, magnetic and ULF anomalies associated with moderate earthquakes in Kumaun Himalaya," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 116(3), pages 3925-3955, April.
    • Handle: RePEc:spr:nathaz:v:116:y:2023:i:3:d:10.1007_s11069-023-05844-y
    DOI: 10.1007/s11069-023-05844-y
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    References listed on IDEAS

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    1. Valery Sorokin & Masashi Hayakawa, 2014. "Plasma and Electromagnetic Effects Caused by the Seismic-Related Disturbances of Electric Current in the Global Circuit," Modern Applied Science, Canadian Center of Science and Education, vol. 8(4), pages 1-61, August.
    2. Potirakis, S.M. & Minadakis, G. & Eftaxias, K., 2012. "Analysis of electromagnetic pre-seismic emissions using Fisher information and Tsallis entropy," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(1), pages 300-306.
    3. Minadakis, George & Potirakis, Stylianos M. & Nomicos, Constantinos & Eftaxias, Konstantinos, 2012. "Linking electromagnetic precursors with earthquake dynamics: An approach based on nonextensive fragment and self-affine asperity models," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 391(6), pages 2232-2244.
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