pure and applied geophysics

, Volume 103, Issue 1, pp 424–432 | Cite as

On distortion of real values of magnitudes

  • I. P. Passechnik


There are considered magnitude values distortions because of not taking into account the properties of links of the system where seismic waves are excited, spread and registrated. The links are: the source, the medium, the thickness of rocks, forming the upper part of seismo-geological section at the station region, seismic channel and processing methods of considered data. The system links are divided into nonoperating (source, medium) and operating (seismogeological section at the station region, seismic channel parameters, processing methods), which can be changed to a certain extent while registrating seismic oscillations.

Strong distortion of narrow band shortperiod and longperiod instrumentation of seismic records is shown. This brings to considerable decreasing magnitude values comparing with the values determined by the records of broad band instrumentation. In order to decrease the magnitude distortion there is recommended the passing to registration. In order to decrease the magnitude distortion there is recommended the passing to registration of seismic oscillations by broad band receiving channels with large dynamic range of 100–120 decibel with magnetic tape digital registration and following processing of the data by the computers.

There is pointed out that seismic stations installation at unweathered crystalline rocks is the most favourable, and a special attention is drawn to necessity of correct choice of the processing methods of the net stations data while calculating the averaged magnitude values.

At present before the complete passing to broad band digital registration there is suggested to determine magnitudes in the international centers on the data by specially chosen stations supplied by most broad band instrumentation, using existing standard scales, practically coinciding with Gutenberg-Richter's scales.


Seismic Wave Processing Method Station Region Seismic Station Crystalline Rock 
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Copyright information

© Birkhäuser Verlag 1973

Authors and Affiliations

  • I. P. Passechnik
    • 1
  1. 1.O. Yu. Shmidt Institute Physics of the EarthAcademy of Sciences of the USSRMoscowUSSR

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