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首页> 外文会议>Increasing Seismic Safety by Combining Engineering Technologies and Seismological Data >Chapter 4.1 Microtremor Soil-Structure Resonance Study in the Bovec Basin (NW Slovenia) Related to 1998 and 2004 Damaging Earthquakes
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Chapter 4.1 Microtremor Soil-Structure Resonance Study in the Bovec Basin (NW Slovenia) Related to 1998 and 2004 Damaging Earthquakes

机译：第4.1章与1998年和2004年破坏性地震有关的Bovec盆地（西北斯洛文尼亚）的微震土-结构共振研究

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The Bovec basin, which is filled with glaciofluvial sediments, has recently been struck by two strong earthquakes (1998 and 2004) which caused extensive damage (VII-VIII EMS-98). Strong site effects resulted in large variations in damage to buildings in the area, which could not be explained by the surface variations in Quaternary sediments. The microtremor horizontal-to-vertical-spectral ratio (HVRS) method was therefore applied to a 200 m dense grid of free-field measurements to assess the fundamental frequency of the sediments. Large variations in the sediments frequency (3-22 Hz) were obtained, with most of the observed values in the range 6-12Hz. The observed frequencies cannot be related to the total thickness of Quaternary sediments (sand, gravel), but can be explained by the presence of conglomerate or lithified moraine at shallow depths. Microtremor measurements performed in 20 two, three and four storey houses (masonry with RC floors), which prevail in the Bovec basin, have shown that the main building frequencies in the area are in the range 7-11 Hz. This indicates that damage to houses in both earthquakes in some parts of the basin was enhanced by site amplification. Areas of possible soil-structure resonance were identified which correspond good to the distribution of damage in both earthquakes.
机译：充满冰川河沉积物的博韦茨盆地最近受到两次强烈地震（1998年和2004年）的袭击，造成了广泛的破坏（VII-VIII EMS-98）。强烈的场地效应导致该地区建筑物破坏的变化很大，这不能用第四纪沉积物的表面变化来解释。因此，将微震水平与垂直光谱之比（HVRS）方法应用于200 m密集网格的自由场测量中，以评估沉积物的基频。获得了沉积物频率的较大变化（3-22 Hz），大多数观测值在6-12Hz范围内。观测到的频率与第四纪沉积物（沙，砾石）的总厚度无关，但可以通过浅深度存在砾岩或石化冰ora来解释。在Bovec盆地中普遍使用的20栋两层，三层和四层房屋（带RC地板的砖石房屋）中进行的微震测量表明，该地区的主要建筑频率在7-11 Hz范围内。这表明，场地放大增加了两次地震对盆地某些地区房屋的破坏。确定了可能发生土壤结构共振的区域，这些区域与两次地震中的破坏分布都相对应。

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