Estimation of seismic source functions of some explosions in the U.S.S.R. using AR method

Physics

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Scientific paper

Autoregressive (AR) modelling of seismograms is used to estimate the high frequency slope of the source spectral variations of synthetic seismograms and of seismograms recorded at Gauribidanur seismometer array (GBA), India, from explosions in the U.S.S.R. region. Analysis of synthetic seismograms shows that the AR method is able to reproduce the expected spectral variation for different T* values and yields. The analysis of explosions in central U.S.S.R. on 7 July 1980, 4 April 1980 and 1 November 1980 shows a high frequency spectral variation ω-2 similar to the predicted variation by von Seggern and Blandford while eastern Kazakh explosions on 29 June 1980 and 18 August 1980 show a ω-4 spectral falloff in the high frequency region as proposed in the source function model of Haskell. The recovered spectrum of western Kazakh event on 14 July 1980 shows a ω-3 variation in the high frequency which could have occurred due to Helmberger's type of source model or due to interference between P and pP.

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