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Seismic Microzonation of the Urban Area Using Microtremor Measurement Hassan Sharafi School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran M. H. Baziar School of Civil Engineering, Iran University of Science and Technology, Tehran, Iran S. M. Haeri School of Civil Engineering, Sharif University of Technology, Tehran, Iran | |
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ABSTRACT |
One of the methods by which one can state dynamic characteristics of the soil an area, is the measurement and study of microtremors. Microtremors are small scale vibrations that occur in the ground from unknown sources and have an amplitude range of about 1 to 10 microns. Natural sources, like wind and sea waves or artificial sources like traffic or machine vibration may build up the microtremors in ground. When a microtremor passes along a deposit, it is altered by the seismic characteristics of that deposit. So measurement and analysis of these microtremors can show the dynamic characteristics of the soil in question, such as the natural period, dominate period, and to some extent amplification factor associated with the deposit. Due to importance of the vertical component of the earthquake (as been observed in the recent earthquake), in this project we have worked on the vertical component of the microtremors. Microtremors were measured on 113 sites located on soil deposits. These sites were chosen o profiles that cover the city in two directions.
Keywords: Microzonation, Spectra Analysis, Dynamic Period, Amplification Factor, Microtremor.
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