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Reconstruction of a Reference Subsoil Model for the Seismic Microzonation of Gori (Georgia): A Procedure Based on Principal Component Analysis (PCA)
Bulletin of the Seismological Society of America ( IF 3 ) Pub Date : 2021-08-01 , DOI: 10.1785/0120200341
Silvia Giallini 1 , Enrico Paolucci 2 , Pietro Sirianni 1 , Dario Albarello 1, 2 , Iolanda Gaudiosi 1 , Federica Polpetta 1 , Maurizio Simionato 1 , Francesco Stigliano 1 , Nino Tsereteli 3 , Zurab Gogoladze 3 , Massimiliano Moscatelli 1
Affiliation  

This article focuses on the full exploitation of geological and economically viable geophysical surveys for the seismic characterization of the shallow subsoil in the frame of microzonation studies in urban areas where economic resources for detailed seismic response analyses are scarce. In these conditions, the outcomes of inexpensive geophysical surveys (e.g., based on ambient vibration monitoring or surface‐wave prospecting) must be fully exploited. To reduce the uncertainties related to these kinds of procedures, their joint interpretation in the light of geological evidence is mandatory. To this purpose, we propose the application of principal component analysis to combine the results of distributed single‐station ambient vibration measurements (horizontal‐to‐vertical spectral ratio [HVSR] technique) to provide a preliminary zonation of the study area. The zones identified in this way are then characterized by considering the available geognostic boreholes, VS profiles deduced by the joint inversion of HVSR curves, and available Rayleigh‐wave dispersion curves deduced from active seismic prospecting (multichannel analysis of surface‐waves technique). The final outcome allows the definition of a preliminary seismic model of the study area, which is also constrained by the available geological data deduced from on‐purpose surveys. The proposed approach has been applied to the city of Gori (Georgia). The proposed approach allowed a reliable assessment of buried geometries, geological domains, and the distribution of lithofacies, which can control the local seismic response. In detail, the major role of paleovalley infills and interfluve domains has been enlightened by adding in evidence concerning the peculiar stratigraphic relationships and buried morphologies, which may determine 1D and 2D resonance effects.

中文翻译:

重建哥里(格鲁吉亚)地震微带参考底土模型:基于主成分分析 (PCA) 的程序

本文的重点是充分利用地质和经济上可行的地球物理调查,以在城市地区的微带研究框架内对浅层底土进行地震表征,这些地区缺乏用于详细地震响应分析的经济资源。在这些条件下,必须充分利用廉价地球物理勘测(例如,基于环境振动监测或表面波勘探)的结果。为减少此类程序的不确定性,必须根据地质证据进行联合解释。为此,我们建议应用主成分分析来结合分布式单站环境振动测量的结果(水平垂直光谱比 [HVSR] 技术),以提供研究区域的初步分区。然后通过考虑可用的地质钻孔、由 HVSR 曲线联合反演推导出的 VS 剖面以及从主动地震勘探(表面波技术的多道分析)推导出的可用瑞利波频散曲线来表征以这种方式识别的区域。最终结果允许定义研究区的初步地震模型,这也受到从有目的的调查中推导出的可用地质数据的约束。提议的方法已应用于哥里市(格鲁吉亚)。所提出的方法允许对埋藏的几何形状、地质区域和岩相分布进行可靠的评估,这可以控制当地的地震响应。具体而言,通过增加有关特殊地层关系和埋藏形态的证据,揭示了古河谷充填和河间域的主要作用,这些证据可能决定一维和二维共振效应。
更新日期:2021-07-23
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