Energy class

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Energy class – also called energy class K or K-class , and denoted by K (from the Russian класс) – is a measure of the force or magnitude of local and regional earthquakes used in countries of the

magnitude scales;[3] a magnitude Mw 6.0 quake will register between 13 and 14.5 on various K-class scales.[4]
The energy class system was developed by seismologists of the Soviet Tadzhikskaya Complex [Interdisciplinary] Seismological Expedition established in the remote Garm (Tajikistan) region of Central Asia in 1954 after several devastating earthquakes in that area.[5]

The Garm region is one of the most seismically active regions of the

magnitude scales
developed by Western seismologists, which estimate the magnitude from the amplitude of some portion of the seismic waves generated, an indirect measure of seismic energy.)

However, proper estimation of ES requires more sophisticated tools than were available at the time, and Bune's method was unworkable.

S-wave – within the first three seconds.[13] As a result, K-class became a kind of local magnitude scale, similarly limited to local and regional earthquakes of about M 6.5 (K 15) or less, above which point it saturates (underestimates the magnitude).[14]

Rautian also developed a

Kamchatka regions in the Far East.[16]

There are various formulas to convert K-class to other magnitude scales; these are usually specific to the regional network.[17] M(K) (or some variant) is sometimes used to identify magnitudes that have been calculated from a K value.[18]

See also

Notes

  1. ^ Rautian et al. 2007; IS 3.7 2012, pp. 1, 6.
  2. ^ NMSOP-2 Information Sheet IS 3.7 2012, p. 1.
  3. ^ Bindi et al. 2011, p. 330.
  4. ^ IS 3.7 2012, Figure 9.
  5. ^ Neresov & Riznichenko 1960, pp. 1, 4, 6; Rautian et al. 2007, p. 579.
  6. ^ Neresov & Riznichenko 1960, p. 10.
  7. ^ Rautian et al. 2007, p. 579.
  8. ^ Neresov & Riznichenko 1960, p. 7; Rautian et al. 2007, p. 579.
  9. ^ Rautian et al. 2007, p. 579.
  10. ^ Solov'ev is mentioned in this regard in Rautian et al. 2007, p. 579. Solov'ev's dissertation, "Energy Classification of Earthquakes of the USSR", and two other related works are cited in Bunz & Gzovskiy 1960, p. 519.
  11. ^ Rautian et al. 2007, pp. 580–581 IS 3.7 2012, pp. 2–3
  12. ^ Rautian et al. 2007, p. 581.
  13. ^ IS 3.7 2012, pp. 2, 3. See Rautian et al. (2007, p. 581) for a more detailed description.
  14. ^ Bormann, Wendt & Di Giacomo 2013, p. 75; IS 3.7 2012, pp. 3, 7, 22.
  15. ^ Rautian et al. 2007, pp. 581–581.
  16. ^ Rautian & Leith 2002, p. 160, and map coordinates for regions in Table 3, pp. 162–163; Rautian et al. 2007, pp. 583–584, 587, map of regional networks on p. 580; IS 3.7 2012, §3.
  17. ^ See Table 1 in IS 3.7 (2012, p. 13) for a list. See also Bormann, Wendt & Di Giacomo 2013, pp. 75–76 on the challenge of converting K values into magnitudes.
  18. ^ Rautian & Leith 2002, p. 160.

Sources

  • Bindi, D.; Parolai, S.; Oth, K.; Abdrakhmatov, A.; Muraliev, A.; Zschau, J. (October 2011), "Intensity prediction equations for Central Asia", Geophysical Journal International, 187 (1): 327–337,
    doi:10.1111/j.1365-246X.2011.05142.x
    .
  • Neresov, V. I.; Riznichenko, Yu. V. (1963) [1960], "Introduction", in Bunz, V. I.; Gzovskiy, M. V.; Riznichenko, Yu. V. (eds.), Methods for a Detailed Study of Seismicity [Metody Detal'nogg Izucheniya Sesmichonsti], Moscow: Izdatel'stvo Akademii Nauk SSSR[permanent dead link].
  • Rautian, T. G.; Khalturin, V. I.; Fujita, K.; Mackey, K. G.; Kendall, A. D. (November–December 2007), "Origins and Methodology of the Russian Energy K-Class System and Its Relationship to Magnitude Scales", Seismological Research Letters, 78 (6): 579–590,
    doi:10.1785/gssrl.78.6.579
    .
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