8/18/2023 0 Comments Iso method map![]() The free-field microtremor data shows that this frequency range occupies 37% of the urban area in the Litija basin. To assess the possible occurrence of soil-structure resonance in general, the average fundamental frequency +/- one standard deviation interval is obtained for these two building heights, which gives the range 5.6- 11.1 Hz. By microtremor measurements inside 45 such buildings their fundamental longitudinal and transverse frequencies were determined and statistically analysed in a complementary study. Low-rise masonry family houses with two or three floors prevail. For soil-structure resonance assessment we considered large building stock from different Slovenian towns, because the building typology is similar in wider area. The iso-frequency map was prepared by using natural neighbour interpolation algorithm. In general clear spectral peaks were obtained for 57 measuring points which show distribution of frequencies in a broad range between 4.4 and 22.7 Hz. As a contribution to the first seismic microzonation of the area, we performed a free-field study based on the microtremor HVSR method in order to assess the resonance frequency of the sediments. On the other hand no borehole or geophysical data are available to support quantitative assessment of site effects. ![]() The town is located in a shallow sedimentary basin filled with relatively soft Quaternary sediments in which seismic site amplification is expected. Abstract : The town of Litija was hit by four damaging earthquakes in the last 120 years which reached a maximum intensity of VII- VIII MSK.
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