TITLE:
The High Frequency Decay Parameter κ (Kappa) in the Region of North East India
AUTHORS:
Renu Yadav, Dinesh Kumar, Sumer Chopra
KEYWORDS:
Kappa, GMPE, Strong Ground Motion, Simulation, Seismic Hazard
JOURNAL NAME:
Open Journal of Earthquake Research,
Vol.7 No.2,
May
31,
2018
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.