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Adaptive Method for Revealing Tidal Variations in Weak Seismicity

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Abstract

The paper proposes a method for searching for the M2 tidal harmonic in seismicity, based on the construction of time series of conditional accumulated seismic energy (CASE) with a given discretization and their adaptive spectral analysis. The preliminary results of testing this method on seismic observations throughout the territory of California for the period 1983–2012 are presented. For the first time, the fundamental harmonic of the lunar tide M2 was reliably identified in weak seismicity variations at a significance level above 5σ in the range of energy classes 5–9. Confinement of areas with significant M2 amplitudes to the San Andreas Fault and its branches was established.

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Funding

The study was supported by the Ministry of Education and Science of the Russian Federation (within the state task of the Federal Research Center Geophysical Survey of the Russian Academy of Sciences no. 075-01471-22 and state task of the Institute of Geology of the Dagestan Federal Research Center of the Russian Academy of Sciences no. AAAA-A17-117021310201-9).

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Authors and Affiliations

  1. Geophysical Survey, Russian Academy of Sciences, 249035, Obninsk, Kaluga oblast, Russia

    D. G. Taimazov, M. G. Magomed-Kasumov, T. I. Sharapudinov & M. S. Sultanakhmedov

  2. Institute of Geology, Dagestan Federal Research Center, Russian Academy of Sciences, 367000, Makhachkala, Russia

    D. G. Taimazov

  3. Dagestan Federal Research Center, Russian Academy of Sciences, 367000, Makhachkala, Russia

    M. G. Magomed-Kasumov, T. I. Sharapudinov & M. S. Sultanakhmedov

Authors
  1. D. G. Taimazov
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  2. M. G. Magomed-Kasumov
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  3. T. I. Sharapudinov
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  4. M. S. Sultanakhmedov
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Correspondence to D. G. Taimazov.

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Taimazov, D.G., Magomed-Kasumov, M.G., Sharapudinov, T.I. et al. Adaptive Method for Revealing Tidal Variations in Weak Seismicity. Seism. Instr. 58 (Suppl 2), S372–S380 (2022). https://doi.org/10.3103/S0747923922080199

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  • DOI: https://doi.org/10.3103/S0747923922080199

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