场地特性的瑞利波频散曲线和扩散场HVSR的联合分析：El Ejido镇（SE西班牙）的实例
Joint analysis of Rayleigh-wave dispersion curves and diffuse-field HVSR for site characterization: The case of El Ejido town (SE Spain)
摘要：
El Ejido镇位于西班牙地震活跃区的一个深沉积盆地之上，这促使人们对其地震反应特征进行研究。为此，在扩散场假设（DFA）下，通过瑞利波波频散曲线的联合反演和环境噪声（HVSR）水平-垂直谱比的全波场模拟，得到了横波速度模型。结合空间自相关调查（SPAC）与阵列孔径的几百米和HVSR显示低频峰值允许表征深层地面功能下至三叠纪基岩。占主导地位的时期，在镇范围从0.8到2.3秒，增长向东南部，在较高的频率很少有次峰。通过岩土工程勘察、多道表面波分析（MASW）和小孔径阵列SPAC分析，对浅层结构进行了探测。由此产生的模型支持一般分类的地面作为硬土。
英文摘要：
The location of El Ejido town over a deep sedimentary basin in a zone of high seismicity in the Spanish context has motivated research on its seismic response characterization. To this aim, S-wave velocity models have been obtained from joint inversion of Rayleigh wave dispersion curves and full-wavefield modelling of the horizontal-to-vertical spectral ratio of ambient noise (HVSR) under the diffuse field assumption (DFA). Combination of spatial autocorrelation surveys (SPAC) with array apertures of several hundred metres and HVSRs displaying low-frequency peaks allowed to characterize deep ground features down to the Triassic bedrock. Predominant periods in the town ranged from 0.8 to 2.3 s, growing towards the SE, with few secondary peaks at higher frequencies. The shallow structure has been explored by means of geotechnical surveys, Multichannel Analysis of Surface Waves (MASW) and SPAC analysis in small-aperture arrays. Resulting models support a general classification of the ground as stiff soil.
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