Microtremor observation for local site conditions

Abstract EN

In this investigation microtremor recordings were conducted in three individual sites at Baghdad city.

Three components of digital seismic recording system was used.

The measurements were carried out in the -frequency range of (1-10) Hz.

Recording data were exposed to two types of analytical techniques.

The first to their predominant frequencies, the second uses amplitude ratio of spectra obtained by point measurements.

The results of analysis revealed that, the predominant peak frequencies in the spectral analysis are in the range of (3 - 5) Hz.

This fluctuation may be due to local soil condition.

The amplification characteristics in the form of spectral ratio for the three sites were also computed.

-