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A source and ground motion study of earthquakes in and near Delhi (the National Capital Region), India

Author

Listed:
  • Brijesh K. Bansal

    (Ministry of Earth Sciences
    Indian Institute of Technology Delhi)

  • S. K. Singh

    (Universidad Nacional Autónoma de México)

  • G. Suresh

    (Ministry of Earth Sciences)

  • H. Mittal

    (Ministry of Earth Sciences)

Abstract

We study source parameters of 10 local earthquakes (2.7 ≤ $$M_{w}$$ M w ≤ 4.5) that have occurred in the National Capital Region (NCR) since 2001 and the ground motions produced by these events. Moment rate spectra of the earthquakes retrieved from the recordings at hard sites after applying corrections for geometrical spreading (1/R, R ≤ 100 km), anelastic attenuation (Q = 253f0.8) and cutoff frequency (fm = 35 Hz) are reasonably well fit by the Brune ω2-source model with stress drop ranging between 0.9 and 13 MPa. Neglecting the outlier low-stress drop value, the average stress drop is 6 MPa. We apply a modified standard spectral ratio technique to estimate site effect at 38 soft sites in the NCR as well as the geometrical mean site effect with respect to a reference hard site. Application of the stochastic method, with source characterized by the Brune ω2- model with stress drop of 6 MPa and the mean site effect for soft sites, yields peak horizontal ground acceleration and velocity curves that are in good agreement with the observed values. These results provide the parameters needed for the application of the stochastic method to predict ground motions at hard and soft sites in the NCR during postulated $$M_{w}$$ M w ≤ 5.5 earthquakes.

Suggested Citation

  • Brijesh K. Bansal & S. K. Singh & G. Suresh & H. Mittal, 2022. "A source and ground motion study of earthquakes in and near Delhi (the National Capital Region), India," 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. 111(2), pages 1885-1905, March.
    • Handle: RePEc:spr:nathaz:v:111:y:2022:i:2:d:10.1007_s11069-021-05121-w
    DOI: 10.1007/s11069-021-05121-w
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    References listed on IDEAS

    as
    1. Manisha Sandhu & Babita Sharma & Himanshu Mittal & R. B. S. Yadav & Dinesh Kumar & S. S. Teotia, 2020. "Simulation of strong ground motion due to active Sohna fault in Delhi, National Capital Region (NCR) of India: an implication for imminent plausible seismic hazard," 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(3), pages 2389-2408, December.
    2. Himanshu Mittal & Yih-Min Wu & Da-Yi Chen & Wei-An Chao, 2016. "Stochastic finite modeling of ground motion for March 5, 2012, Mw 4.6 earthquake and scenario greater magnitude earthquake in the proximity of Delhi," 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. 82(2), pages 1123-1146, June.
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