Probabilistic seismic source inversion from regional landslide evidence

Probabilistic seismic source inversion from regional landslide evidence
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根据区域滑坡证据进行概率震源反演

DOI:
10.1007/s10346-021-01780-9
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发表时间:
2022
期刊:
影响因子:
6.7
通讯作者:
Maurer, Brett W.
Maurer, Brett W.
中科院分区:
地球科学2区
文献类型:
--
作者:
Rasanen, Ryan A.;Maurer, Brett W.

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在地震活动不频繁但具有潜在破坏性的地区,现代地震目录可能不足以为地震危险性分析提供投入(即,故障位置和幅值-频率关系)。因此,分析古地震证据,如同震滑坡,通常用于帮助阐明地震记录,从而减少地震危险的不确定性。然而,虽然古滑坡已被广泛研究,现有的反分析技术(即,限制引起地震的震级和/或地面运动)具有几个缺点,即,它们(i)要求已知引起地震的位置,(ii)仅提供地震参数的下限估计,以及(iii)本质上是确定性的。因此,本文提出了一个灵活的反演框架,概率约束震源参数从区域古滑坡证据。该框架的输出是(i)约束断层破裂位置的地理空间似然曲面和(ii)破裂幅度的概率分布。模拟古滑坡的研究是在现代地震与已知的参数。这些例子表明了该框架的潜在启发性以及实施方面的重要经验教训。拟议的框架有可能从世界各地的地震带遗迹滑坡证据中提取新的见解。
In regions of infrequent but potentially damaging seismicity, modern earthquake inventories may be insufficient to provide inputs to seismic hazard analyses (i.e., fault locations and magnitude–frequency relations). As a result, analysis of paleoseismic evidence, such as coseismic landsliding, is commonly used to help elucidate the seismic record, thereby reducing seismic hazard uncertainty. However, while paleolandslides have been investigated widely, existing inverse-analysis techniques (i.e., to constrain the causative earthquake magnitude and/or ground motions) have several shortcomings, namely, they (i) require the location of the causative earthquake to be known, (ii) provide only a lower-bound estimate of seismic parameters, and (iii) are deterministic in nature. Accordingly, this paper proposes a flexible inversion framework that probabilistically constrains seismic source parameters from regional paleolandslide evidence. The outputs of this framework are (i) a geospatial likelihood surface that constrains the location of fault rupture and (ii) a probability distribution of the rupture magnitude. Simulated paleolandslide studies are performed on modern earthquakes with known parameters. These examples demonstrate the framework’s provocative potential as well as important lessons for implementation. The proposed framework has the potential to extract new insights from relic landslide evidence in seismic zones worldwide.
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