Effects of mass entrainment on the estimation of landslide parameters from long-period seismic inversion

IF 1.6 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Xiao Wang, Xinghui Huang, Po Chen, Leilei Xu, Heng Wang, Wenze Deng, Dan Yu, Zhengyuan Li, Qiang Xu
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Abstract

Force history inverted from long-period seismic records for a landslide has been widely used to extract its physical parameters. Most previous studies have adopted the point-source constant-mass landslide model during the inversion. In this study, we quantitatively investigate the effects of mass entrainment at different locations along the sliding path during the interpretation of inversion results. To demonstrate our analysis, we carried out the long-period seismic waveform inversion for the 2003 Qianjiangping landslide to obtain its force history and subsequently estimated its movement parameters. We propose a mass entrainment model based on the conservation of kinetic energy. The predictions of our mass entrainment model are verified using the inversion results of the Qianjiangping landslide and other events. Results from our mass entrainment model suggest that when half of the sliding mass is entrained at different locations along the sliding path, the estimated masses and maximum velocities vary between 50–100% and 83.38–122.26%, respectively. In particular, when the entrainment occurred at the slow-down phase, the estimated mass is less than 60% of the total mass, which is a good approximation of the initial sliding mass. The model can provide useful constraints for quantitative interpretations of landslide force history inversions of landslides.

Abstract Image

质量夹带对长周期地震反演滑坡参数估计的影响
从长周期地震记录反演的滑坡受力历史已被广泛用于提取其物理参数。以往的研究大多采用点源等质量滑坡模型进行反演。在这项研究中,我们定量地研究了在解释反演结果时沿滑动路径不同位置的质量夹带的影响。为了验证我们的分析,我们对2003年钱江坪滑坡进行了长周期地震波形反演,获得了其受力历史,并估计了其运动参数。我们提出了一个基于动能守恒的质量夹带模型。用钱江坪滑坡等事件的反演结果验证了质量夹带模型的预测结果。我们的质量夹带模型的结果表明,当一半的滑动质量被夹带在滑动路径的不同位置时,估计的质量和最大速度分别在50-100%和83.38-122.26%之间。特别是,当夹带发生在减速阶段时,估计的质量小于总质量的60%,这是一个很好的近似初始滑动质量。该模型可以为滑坡力史反演的定量解释提供有用的约束条件。
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来源期刊
Journal of Seismology
Journal of Seismology 地学-地球化学与地球物理
CiteScore
3.30
自引率
6.20%
发文量
67
审稿时长
3 months
期刊介绍: Journal of Seismology is an international journal specialising in all observational and theoretical aspects related to earthquake occurrence. Research topics may cover: seismotectonics, seismicity, historical seismicity, seismic source physics, strong ground motion studies, seismic hazard or risk, engineering seismology, physics of fault systems, triggered and induced seismicity, mining seismology, volcano seismology, earthquake prediction, structural investigations ranging from local to regional and global studies with a particular focus on passive experiments.
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