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Characteristics of Radiation and Propagation of Seismic Waves in Northern Finland, Estimated Based on Records of Local Earthquakes

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The characteristics of radiation and propagation of seismic waves required in various seismological applications, especially in seismic hazard assessment, are estimated in northern Finland based on records of local earthquakes (~ 80 records from four stations, Mw ~ 1.5 to 4.1, h ~ 3 to 25 km). Northern Finland possesses relatively low seismic activity; however, rather strong earthquakes occurred there in the past. We applied coda-normalization method to estimate the quality factor Q(f)~ Q0fn and then verified and corrected the Q(f) estimates at low frequencies by stochastic simulations. We obtained Q0~ 80 to 100, n ~ 1.1 to 1.2 for hypocentral distances of ~ 20 to 150 km, and Q0~ 180 to 350, n ~ 0.7 to 0.9 for hypocentral distances of ~ 150 to 320 km. Other parameters were estimated by the empirical methods and stochastic simulation of local earthquakes (ML > 2.0). We estimated the stress drop (∆σ ~ 200 bars), geometrical spreading (as a two-segment function: 1/R for R ~ 0 to 80 km and 1/80 for R ~ 80 to 300 km), the duration of seismic motion depending on the hypocentral distance, kappa value (κ ~ 0.001 to 0.03 s), and some other parameters. The obtained high estimates of the stress drop, along with rather high Q values, may result in noticeably increased (compared to those that could be expected on average) PGA estimates in seismic hazard assessment in northern Finland.

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Acknowledgements

The study used the data of northern Finland Seismological Network that is a part of EPOS (European Plate Observing System) research infrastructure and national FIN-EPOS infrastructure. The study was supported by the Academy of Finland (Grant no. 299324) and University of Oulu (Finland). We are thankful to the SGO computer specialist Riitta Hurskainen for the assistance with data preparation.

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Authors and Affiliations

  1. Institute of Physics of the Earth, Russian Academy of Sciences, B. Gruzinskaya, 10, Moscow, 123995, Russian Federation

    Olga Pavlenko

  2. Geological Survey of Finland, P.O. BOX 96, 02151, Espoo, Finland

    Elena Kozlovskaya

  3. Oulu Mining School, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland

    Elena Kozlovskaya

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  1. Olga Pavlenko
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Correspondence to Olga Pavlenko.

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Pavlenko, O., Kozlovskaya, E. Characteristics of Radiation and Propagation of Seismic Waves in Northern Finland, Estimated Based on Records of Local Earthquakes. Pure Appl. Geophys. 175, 4197–4223 (2018). https://doi.org/10.1007/s00024-018-1919-5

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