Writers : Ghafouri, Mohammad; Lashkaripour, Gholam Reza; Hafezi Moghadas, Naser; Akbari, Magid; Yazdanfar, Rouzbe
Refference : Proceeding of the first applied geological congress of Iran(volume.2)
Publishing Year : 1386

Abstract :
Measurement and analysis of microtremor data is an efficient and low cost method for seismic hazard assessment. This method is useful for determining site effects in the regions of low and moderate seismic activity, where ground motion records are low, specially in the urban areas with high level of noises. The aim of this study is assessment of distribution of surface soils predominant frequency and spectral ratio amplitude in the east of Mashhad city by using Nakamura method. In this study microtremors data which have observed at 90 sites in the study area. The data were processed by PITSA software and those codes which have been written by MATLB software and plotted their spectral ratio diagrams. So that predominant frequency and spectral ratio amplitude have been exploited from these diagrams. Based on data analyses it is confirmed that the least predominant frequency is 0.29 Hz in R05 and Q05 sites and the maximum frequencies were calculated 8.96 and 8.2 Hz in T01 and U01 sites , Respectively.
Subject List : seismic microzonation