Dear All,
I am going to use NGA-east attenuation relationship for a work. While I am using the NGA Atkinson Boore attenuation relationship for hard rock site ( Vs=3000 m/sec) an 1.5 time amplification in between pga level and 100 Hz spectral acceleration level is observed.
It also observed in openquake.
One answer is highly appreciated.
Thanks in advance
Dear Srijit,
In general, short period waves transfer much more easily through geological rock sites that are comprised of more compact rocks (e.g., granites and basalts). Hence, the short period part of the spectrum will have much large amplification for such (hard) rock sites compared to the sites located on (softer) deep geological deposits. This phenomenon was analyzed in a recent seismic hazard study for a mountainous region in Serbia:
Article The effects of geological surroundings on earthquake-induced...
Hope this was helpful.
Best regards,
Borko Bulajic
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Assoc. Prof. Borko Đ. Bulajić, PhD
University of Novi Sad, Faculty of Technical Sciences
Department of Civil Engineering and Geodesy
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