利用微动HVSR跟踪速度变化：Campo de Dalías盆地的实例研究（SE西班牙）
On the Use of the Microtremor HVSR for Tracking Velocity Changes: A case study in Campo de Dalías basin (SE Spain)
摘要：
研究了坎波德达利亚斯盆地（CDB）无源地震勘探中采用水平垂直谱比（HVSR）方法获得的低频峰值（< 1 Hz）的稳定性。三个临时地震台安装在偏远的网站，使研究其特征的脉动HVSR（MHVSR）形状的平稳性。所有台站于2016年年中开始运行，并记录了至少一年的连续地震环境噪声数据，有些台站长达两年。每一个地震台都在其附近有一个受监测的钻孔，每30分钟记录一次地下水位。计算150 s时间窗的MHVSR曲线，并取平均值。已经定义了四个参数来表征主峰周围的MHVSR的形状，并将它们与几个环境变量进行比较。MHVSR特征和地下水位之间的相关性表明是最持久的。MHVSR方法应用于地震工程的鲁棒性没有被发现受到损害，因为观察到的变化是在可接受的偏差范围内。我们的研究结果拓宽了MHVSR方法的可能性，从一个可靠的预测地震共振，也是一个自主的监测工具，特别是敏感的S波修改。
英文摘要：
The stability of the low-frequency peaks (< 1 Hz) obtained in the passive seismic survey of Campo de Dalías basin (CDB) by applying the horizontal-to-vertical spectral ratio (HVSR) method was investigated. Three temporary seismic stations were installed in remote sites that enabled studying the stationarity of their characteristic microtremor HVSR (MHVSR) shapes. All stations began to operate in mid-2016 and recorded at least one year of continuous seismic ambient noise data, having up to two years in some. Each seismic station counted with a monitored borehole in their vicinity, registering the groundwater level every 30 minutes. The MHVSR curves were calculated for time windows of 150 s and averaged hourly. Four parameters have been defined to characterize the shape of the MHVSR around the main peak and to compare them with several environmental variables. Correlations between MHVSR characteristics and the groundwater level showed to be the most persistent. The robustness of MHVSR method for applications to seismic engineering was not found to be compromised since the observed variations were within the margins of acceptable deviations. Our results widen the possibilities of the MHVSR method from being a reliable predictor for seismic resonance to also being an autonomous monitoring tool, especially sensitive to the S-wave modifications.
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