Seismic Noise Parameters as Indicators of Reversible Modifications in Slope Stability: A Review
Seismic Noise Parameters as Indicators of Reversible Modifications in Slope Stability: A Review
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地震噪声参数作为边坡稳定性可逆改变的指标：综述
作者：
C. Colombero;D. Jongmans;Sylvain Fiolleau;J. Valentin;L. Baillet;É. Larose;G. Bièvre
对潜在不稳定地点进行连续环境地震监测，以进行前兆识别和预警，越来越受到研究人员的重视。2012年至2020年间，文献报道了12例长期连续噪声监测。只有在少数情况下发生破裂，从噪声记录中提取的共振频率值或横波速度的不可逆下降被记录下来。另一方面，由于外部天气条件（气温和降水）的变化，所有监测站点的地震参数在日和季节尺度上都表现出明显的可逆波动。这些可逆变化的定量比较用于深入了解驱动现场地震反应的机制。确定了6种可能的机制，包括3种温度驱动机制（裂缝开/闭的温度控制、表面应力条件和体刚度）、1种降水驱动机制（水渗透效应）和2种对温度和降水都敏感的机制（冰的形成和粘土的行为）。综合了气象条件下地震参数的可逆变化，并与不同地质条件下破坏前观测到的不可逆变化进行了比较。
Continuous ambient seismic monitoring of potentially unstable sites is increasingly attracting the attention of researchers for precursor recognition and early warning purposes. Twelve cases of long-term continuous noise monitoring have been reported in the literature between 2012 and 2020. Only in a few cases rupture was achieved and irreversible drops in resonance frequency values or shear wave velocity extracted from noise recordings were documented. On the other hand, all monitored sites showed clear reversible fluctuations of the seismic parameters on a daily and seasonal scale due to changes in external weather conditions (air temperature and precipitation). A quantitative comparison of these reversible modifications is used to gain insight into the mechanisms driving the site seismic response. Six possible mechanisms were identified, including three temperature-driven mechanisms (temperature control on fracture opening/closing, superficial stress conditions and bulk rigidity), one precipitation-driven mechanism (water infiltration effect) and two mechanisms sensitive to both temperature and precipitation (ice formation and clay behavior). The reversible variations in seismic parameters under the meteorological constraints are synthesized and compared to the irreversible changes observed prior to failure in different geological conditions.