Analysis of nonstationary properties of ground motion recorded during the Montenegro earthquake of 15 April 1979 |
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| Authors: | Miodrag Manic |
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| Institution: | (1) Institute of Earthquake Engineering and Engineering Seismology, University  Kiriland Metodij , Skopje, POB 101, 91 000 Skopje, Macedonia |
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| Abstract: | The accelerogram of a strong ground motion represents the detailed characteristics of an earthquake and contains a large number of data both for earthquake engineers and seismologists. It shows not only the intensity, the frequency content and the duration of the strong ground motion, but also data referring to source origin, wave propagation mechanism, geological and site conditions at the recording site and its closer surrounding. Therefore, recently, accelerograms analysis has become a widely accepted method for fundamental investigations referring to understanding the background of the seismic waves generation and propagation mechanism and investigation of the strong ground motion nature and the parameters defining the ground motion for the needs of seismic resistant design.Presented in this paper are the results from the nonstationary analysis of the horizontal components of ground motion records obtained during the Montenegro earthquake of 15 April 1979. For the purpose of the analysis, the physical spectra concept was applied, since it enables simultaneous investigation of the time varying nature of the amplitude and the frequency content of the recorded ground motion. The application of the physical spectra for the design of a realistic synthesized accelerogram is also presented. |
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| Keywords: | Physical spectrum synthetic accelerogram multishock event site conditions |
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