1887

Abstract

Summary

Microtremor method has often been used for determination of the fundamental frequency of the sediments covering the bedrock. Relatively, it is easier to apply than drilling, cost-effective and reliable method and has become widespread recently. There are some important issues that need to be considered during the measurements such as cultural noise level, recording time and terrain conditions. It is possible to obtain reliable results from this method, if both data collection and processing stages were carried out adequately. With respect to the suggestions of SESAME Project, the reliability of H/V curves and the apex on the H/V curve representing a possible ground resonance frequency were investigated. There are 3 main suggestions of SESAME Project in order to determine the predominant period (T0) and investigate the reliability of H/ V curves. These conditions are determining suitable number of windows, number of periods should be more than 200 and according to f0 value, standard deviation (σ) of H/V curve should be less than 3 if f0<0.5 Hz and σ<2 if f0>0.5 Hz. Besides, at least 5 over 6 criteria of SESAME Project should be proved in order to obtain a reliable result from the calculated apex of a H/V curve. Thus, the apex of H/V curve can be accepted as a reliable peak and this proves the observer to determine reliable ground parameters as well. In this study, output file of the H/V curve obtained from the evaluation of the microtremor data using Geopsy software was evaluated by an Excel-based program to examine the criteria determined in the context of the SESAME Project. Also the flowchart of the algorithm is presented. Data were collected from the Bornova district of Izmir. The measurements were analysed and the results were interpreted.

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/content/papers/10.3997/2214-4609.201414126
2015-10-05
2024-03-29
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References

  1. Chatelain, J.L., Guillier, B., Cara, F., Duval, A.M., Atakan, K., Bard, P.Y., SESAME Team
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