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首页> 外文期刊>Natural hazards and earth system sciences >Study on the applicability of the microtremor HVSR method to support seismic microzonation in the town of Idrija (W Slovenia)
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Study on the applicability of the microtremor HVSR method to support seismic microzonation in the town of Idrija (W Slovenia)

机译：微调HVSR方法适用于Idrija镇支持地震微观型的研究（W斯洛文尼亚）

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摘要

The town of Idrija is located in an area with an increased seismic hazard in W Slovenia and is partly built on alluvial sediments or artificial mining and smelting deposits which can amplify seismic ground motion. There is a need to prepare a comprehensive seismic microzonation in the near future to support seismic hazard and risk assessment. To study the applicability of the microtremor horizontal-tovertical spectral ratio (HVSR) method for this purpose, 70 free-field microtremor measurements were performed in a town area of 0.8 km(2) with 50-200m spacing between the points. The HVSR analysis has shown that it is possible to derive the sediments' resonance frequency at 48 points. With the remaining one third of the measurements, nearly flat HVSR curves were obtained, indicating a small or negligible impedance contrast with the seismological bedrock. The isofrequency (a range of 2.5-19.5 Hz) and the HVSR peak amplitude (a range of 3-6, with a few larger values) maps were prepared using the natural neighbor interpolation algorithm and compared with the geological map and the map of artificial deposits. Surprisingly no clear correlation was found between the distribution of resonance frequencies or peak amplitudes and the known extent of the supposed "soft" sediments or deposits. This can be explained by relatively well-compacted and rather stiff deposits and the complex geometry of sedimentary bodies. However, at several individual locations it was possible to correlate the shape and amplitude of the HVSR curve with the known geological structure and prominent site effects were established in different places. In given conditions (very limited free space and a high level of noise) it would be difficult to perform an active seismic refraction or MASW measurements to investigate the S-wave velocity profiles and the thickness of sediments in detail, which would be representative enough for microzonation purposes. The importance of the microtremor method is therefore even greater, because it enables a direct estimation of the resonance frequency without knowing the internal structure and physical properties of the shallow subsurface. The results of this study can be directly used in analyses of the possible occurrence of soil-structure resonance of individual buildings, including important cultural heritage mining and other structures protected by UNESCO. Another application of the derived free-field isofrequency map is to support soil classification according to the recent trends in building codes and to calibrate V-s profiles obtained from the microtremor array or geophysical measurements.
机译：Idrija镇位于一个地区，在斯洛文尼亚的地震危害增加，部分内置于冲积沉积物或人造矿山和冶炼沉积物上，可以放大地震地面运动。在不久的将来，需要在不久的将来准备一个综合地震微观，以支持地震危害和风险评估。为研究微调水平往复谱比（HVSR）方法的适用性为此目的，在0.8 km（2）的城镇面积为70米的自由场微火法测量，点之间的光点50-200m间距。 HVSR分析表明，可以在48点处导出沉积物的共振频率。随着测量的剩余三分之一，获得了几乎扁平的HVSR曲线，表明与地震岩基板的小或可忽略不计的阻抗。使用天然邻插插算法制备了同学（2.5-19.5Hz的范围）和HVSR峰值幅度（具有较大的值的3-6的范围）地图，并与地质图和人工地图相比存款。令人惊讶的是，在共振频率或峰值幅度的分布和所谓的“软”沉积物或沉积物的已知程度之间没有发现明确的相关性。这可以通过相对良好的压实和相当沉积的沉积物和沉积体的复杂几何形状来解释。然而，在几个单独的位置，可以将HVSR曲线的形状和幅度与已知的地质结构相关联，并且在不同的地方建立了突出的位点效应。在给定条件（非常有限的自由空间和高水平的噪声）中，难以执行有源地震折射或MasW测量以研究S波速度谱和细节沉积物的厚度，这将是足够的代表性微微化的目的。因此，MicroTremor方法的重要性甚至更大，因为它能够直接估计共振频率而不知道浅层地下的内部结构和物理性质。该研究的结果可以直接用于分析各个建筑物的土壤结构共振的分析，包括由教科文组织保护的重要文化遗产挖掘和其他结构。衍生的自由场非常重映射图的另一个应用是根据最近建筑码的趋势支持土壤分类，并校准从微反线阵列或地球物理测量获得的V-S型材。

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