Site effect estimation using Horizontal to Vertical (H/V) spectral ratio technique in Nile Delta, Egypt

ABSTRACT Study of the seismic wave amplification is very important, as a significant part of damage observed in destructive earthquakes around the world is due to local site effects. The local site effect may cause amplification of seismic waves induced by earthquakes and plays an important role in site-specific ground motion predictions and seismic hazard assessment. The aim of this study is to determine a seismic microzonation by using Nogoshi-Nakamura method experimental technique based on microtremor records. Horizontal to Vertical (H/V) spectral ratios were calculated on Nile Delta at 68 sites using the McSEIS-MT NEO Model 1134 McSEIS-MT NEO instrument. The site effect is typically represented by the resonance frequency (fo) and the associated amplification of ground motion (Ao). The conclusions show the fundamental frequency (fo) ranges from 1.1 to 1.5 at all points, and its corresponding H/V amplitude level (Ao) ranges from 3 to 6.3