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Doklady Earth Sciences

, Volume 472, Issue 2, pp 211–214 | Cite as

The character of scaling earthquake source spectra for Kamchatka in the 3.5–6.5 magnitude range

  • A. A. Gusev
  • E. M. Guseva
Geophysics
  • 18 Downloads

Abstract

The properties of the source spectra of local shallow-focus earthquakes on Kamchatka in the range of magnitudes M w = 3.5–6.5 are studied using 460 records of S-waves obtained at the PET station. The family of average source spectra is constructed; the spectra are used to study the relationship between M w and the key quasi-dimensionless source parameters: stress drop Δσ and apparent stress σa. It is found that the parameter Δσ is almost stable, while σa grows steadily as the magnitude M w increases, indicating that the similarity is violated. It is known that at sufficiently large M w the similarity hypothesis is approximately valid: both parameters Δσ and σa do not show any noticeable magnitude dependence. It has been established that M w ≈ 5.7 is the threshold value of the magnitude when the change in regimes described occurs for the conditions on Kamchatka.

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Copyright information

© Pleiades Publishing, Ltd. 2017

Authors and Affiliations

  1. 1.Institute of Volcanology and Seismology, Far East BranchRussian Academy of SciencesPetropavlovsk-KamchatskyRussia
  2. 2.Kamchatka Branch of the Geophysical SurveyRussian Academy of SciencesPetropavlovsk-KamchatskyRussia

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