Springer Nature is making Coronavirus research free. View research | View latest news | Sign up for updates

A new measure of seismicity

  • 19 Accesses

  • 4 Citations


In this paper an attempt has been made to analyse the World shallow focus earth-quakes by the method ofGutenberg andRichter. Frequency-magnitude analysis of various earthquakes indicate that in the relation logN=a−b M, the ratio (b/a)−1 satisfies fairly well the seismicity of a region and it is felt that this ratio may be used as a measure of seismicity for a given region.

This is a preview of subscription content, log in to check access.


  1. [1]

    R. K. S. Chouhan, V. K. Gaur andR. S. Mithal,Seismicity of Assam, Third Symp. on Earth-quake Engineering, University of Roorkee, 4–6 Nov. 1966 (1966), 423–430.

  2. [2]

    A. S. Furumoto,Seismicity of Hawaii, Pt. I,Frequency Energy Distribution of Earthquakes, Bull. Seism. Soc. Am.56, (1966), 1–12.

  3. [3]

    B. Gutenberg andC. F. Richter,Seismicity of the Earth and Associated Phenomena, 2nd Ed. (Princeton Univ. Press, 1954).

  4. [4]

    B. Issacks andJ. Olivier,Seismic Waves with Frequencies from 1 to 100 Cycles per Sec. Recorded in a Deep Mine in Northern New Jersey, Bull. Seis. Soc. Am.54 (1964), 1941–1979.

  5. [5]

    T. Matuzawa,Study of Earthquakes (Uno Shoten, Tokyo, Japan 1964).

  6. [6]

    C. F. Richier,Elementary Seismology (W. H. Freeman and Co., San Francisco 1958).

  7. [7]

    Lynn R. Sykes,The Seismicity of the Arctic, Bull. Seis. Soc. Am.55, (1965), 519–536.

  8. [8]

    A. N. Tandon andH. M. Chaudhury, A Report on the Seismicity Studies by the India Meteorological Dept, unpublished report (1966).

  9. [9]

    C. Tsuboi,On Seismic Activities in and near Japan, Contribution in Geophysics in Honour of Beno Gutenberg (Pergamon Press, London W-1 (1958).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Chouhan, R.S., Singh, C.L. & Singh, R.D. A new measure of seismicity. PAGEOPH 70, 47–60 (1968). https://doi.org/10.1007/BF00875140

Download citation


  • Shallow Focus