International Research journal of Management Science and Technology

  ISSN 2250 - 1959 (online) ISSN 2348 - 9367 (Print) New DOI : 10.32804/IRJMST

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THE STEEPEST DESCENT METHOD OF ESTIMATION OF ATTENUATION, AND SOURCE PARAMETERS

    1 Author(s):  ATUL JHAJHRIA

Vol -  5, Issue- 12 ,         Page(s) : 136 - 138  (2014 ) DOI : https://doi.org/10.32804/IRJMST

Abstract

Seismic data is used for the inversion using technique of steepest descent algorithm. Seismic data is recorded by PESMOS network and is used for research in this paper. The seismic attenuation, long period spectral level and corner frequency are computed using non-linear inversion method. In this the starting model is chosen randomly and model parameters are updated iteratively by using MATLAB code. The values of attenuation are found to vary from 200–800, corner frequency vary from 2-10 Hz. The model used in this study is the Brune’s model. It has been found that Q values are increasing with distance and fc values are dependent on the site. The Q values are found typical for Indian shield and are compared to the Q values from other regions of the world. Also the values of long period spectral level0 are computed to estimate the size of the earthquake, which correspond to the reported magnitude by various agencies.

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