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Simultaneous monitoring of soil 222Rn in the Eastern Himalayas and the geothermal region of eastern India: an earthquake precursor

Author

Listed:
  • Saheli Chowdhury

    (Jadavpur University
    Jadavpur University)

  • Argha Deb

    (Jadavpur University
    Jadavpur University)

  • Chiranjib Barman

    (Sidho-Kanho-Birsha University)

  • Md. Nurujjaman

    (National Institute of Technology Sikkim)

  • Dipok K. Bora

    (Diphu Govt. College
    Government Model College)

Abstract

Activity of 222Rn gas in soil has been recorded continuously at three monitoring centres, namely Ravangla and Diphu in the Eastern Himalayan region and Tantloi in the geothermal region of eastern India in order to determine possible precursors induced by seismic activity within a few hundred kilometres of the monitoring stations. The recorded data show that various physical and meteorological parameters affect the outflow of radon gas from soil, leading to very complex nonlinear non-stationary soil 222Rn time series. Therefore, a two-step nonlinear technique consisting of empirical mode decomposition and Hilbert–Huang transform has been used for analysis of the simultaneously recorded soil radon data. A number of precursory anomalies caused due to earthquakes of magnitude around 5.0 within 500 km epicentral distance from each monitoring station have been found in the recorded time series of radon in soil at all three centres. An anomaly has been observed simultaneously from the three monitoring stations preceding an earthquake in the common region monitored by the centres. This demonstrates that monitoring of soil radon precursor by a network of stations can be a promising method for understanding earthquake generating processes.

Suggested Citation

  • Saheli Chowdhury & Argha Deb & Chiranjib Barman & Md. Nurujjaman & Dipok K. Bora, 2022. "Simultaneous monitoring of soil 222Rn in the Eastern Himalayas and the geothermal region of eastern India: an earthquake precursor," 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. 112(2), pages 1477-1502, June.
    • Handle: RePEc:spr:nathaz:v:112:y:2022:i:2:d:10.1007_s11069-022-05235-9
    DOI: 10.1007/s11069-022-05235-9
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    References listed on IDEAS

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    1. Sanjay K. Prajapati & O. P. Mishra, 2021. "Co-seismic deformation and slip distribution of 5 April 2017 Mashhad, Iran earthquake using InSAR sentinel-1A image: implication to source characterization and future seismogenesis," 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. 105(3), pages 3039-3057, February.
    2. Arvind Kumar & Vivek Walia & Shih-Jung Lin & Ching-Chou Fu, 2020. "Real-time database for geochemical earthquake precursory research," 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. 104(2), pages 1359-1369, November.
    3. Jens Hartmann & Jason Levy, 2005. "Hydrogeological and Gasgeochemical Earthquake Precursors – A Review for Application," 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. 34(3), pages 279-304, March.
    Full references (including those not matched with items on IDEAS)

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