Abstract
The high frequency decay parameter κ has been considered as one of the important parameters required in the simulation of earthquake strong ground motions necessary for the proper evaluation of seismic hazard of a region. The present study estimated “κ” for the highly seismic active region of North East India. The spectral analysis of 598 accelerograms of 32 earthquakes has been done using [1] approach for this purpose. The average values of “κ” have been found to be 0.049, 0.047 and 0.040 for L-, T- and V-component respectively. The distance dependence of κ is not significant in the region. The κ 0 (κ at R = 0) for soft rock stations is found to be more than those of hard rock sites in consistent with other similar studies. The correlation between “κ” and earthquake magnitude at most of the stations for the region under study is not significant which indicates that κ depends on the site conditions in the region. The κ values estimated in the present study are useful for the evaluation of seismic hazard of the region.
Highlights
The high frequency decay parameter κ has been considered as one of the important parameters required in the simulation of earthquake strong ground motions necessary for the proper evaluation of seismic hazard of a region
The spectral shape of earthquake strong ground motions plays an important role in the simulation of realistic accelerograms using different techniques
The analysis in the present study indicates that kappa for NE region is related with the high frequency attenuation in the top surface layer
Summary
The spectral shape of earthquake strong ground motions plays an important role in the simulation of realistic accelerograms using different techniques. Control the spectral characteristics of the strong ground motions. This phenomenon of high-frequency band limitation of radiated earthquake energy has been given the name “the crashing spectrum syndrome” by [4] and attributed this primarily to the local site effects. This phenomenon of high-frequency band limitation of radiated earthquake energy has been given the name “the crashing spectrum syndrome” by [4] and attributed this primarily to the local site effects. [5] suggested the source (fault nonelasticity) as cause for “fmax” not the site. [6] described a site attenuation parameter “t*” in the form of exponential decay term e−πft* to the spectral attenuation of the waves
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