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Seismic Hazard and Ground Motion Characterization at the Itoiz Dam (Northern Spain)

机译：伊托兹水坝（西班牙北部）的地震危险和地面运动特征

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This paper presents a new hazard-consistent ground motion characterization of the Itoiz dam site, located in Northern Spain. Firstly, we propose a methodology with different approximation levels to the expected ground motion at the dam site. Secondly, we apply this methodology taking into account the particular characteristics of the site and of the dam. Hazard calculations were performed following the Probabilistic Seismic Hazard Assessment method using a logic tree, which accounts for different seismic source zonings and different ground-motion attenuation relationships. The study was done in terms of peak ground acceleration and several spectral accelerations of periods coinciding with the fundamental vibration periods of the dam. In order to estimate these ground motions we consider two different dam conditions: when the dam is empty (T = 0.1 s) and when it is filled with water to its maximum capacity (T = 0.22 s). Additionally, seismic hazard analysis is done for two return periods: 975 years, related to the project earthquake, and 4,975 years, identified with an extreme event. Soil conditions were also taken into account at the site of the dam. Through the proposed methodology we deal with different forms of characterizing ground motion at the study site. In a first step, we obtain the uniform hazard response spectra for the two return periods. In a second step, a disaggregation analysis is done in order to obtain the controlling earthquakes that can affect the dam. Subsequently, we characterize the ground motion at the dam site in terms of specific response spectra for target motions defined by the expected values SA (T) of T = 0.1 and 0.22 s for the return periods of 975 and 4,975 years, respectively. Finally, synthetic acceleration time histories for earthquake events matching the controlling parameters are generated using the discrete wave-number method and subsequently analyzed. Because of the short relative distances between the controlling earthquakes and the dam site we considered finite sources in these computations. We conclude that directivity effects should be taken into account as an important variable in this kind of studies for ground motion characteristics.
机译：本文介绍了位于西班牙北部的伊托伊兹大坝工地的新的与灾害一致的地震动特征。首先，我们提出了一种与大坝现场预期地面运动具有不同近似水平的方法。其次，我们在考虑场地和大坝的特殊特征的情况下采用这种方法。按照概率地震危险性评估方法，使用逻辑树进行了危险性计算，该逻辑树说明了不同的地震源分区和不同的地面运动衰减关系。该研究是根据地面的峰值加速度和与大坝基本振动周期一致的周期的几种频谱加速度进行的。为了估算这些地面运动，我们考虑了两种不同的大坝状况：大坝为空时（T = 0.1 s），大坝充满水时（T = 0.22 s）。此外，地震危害分析还进行了两个返回期：与项目地震有关的975年，以及与极端事件相关的4,975年。大坝所在地的土壤条件也被考虑在内。通过提出的方法，我们研究了研究场地不同形式的地面运动特征。第一步，我们获得两个返回期的统一危害响应谱。第二步，进行分解分析，以获得可能影响大坝的控制地震。随后，我们根据目标运动的特定响应谱来表征坝址处的地面运动，该响应谱分别由期望值SA（T）T = 0.1和0.22 s定义，分别返回975年和4,975年。最后，使用离散波数方法生成与控制参数匹配的地震事件的合成加速时间历史，然后进行分析。由于控制地震与坝址之间的相对距离较短，因此我们在这些计算中考虑了有限源。我们得出结论，在这种对地面运动特征的研究中，应将方向性影响作为重要变量考虑在内。

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