意大利斯特龙博利火山建筑物的多尺度断裂、物理和机械特性

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY
T. Alcock , S. Vinciguerra , P.M. Benson , D. Bullen
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引用次数: 0

摘要

对斯特龙博利火山的物理、机械和断裂特性进行了多尺度综合研究,以了解假定的东北/西南裂谷带和 Sciara del Fuoco(SDF)凹陷之间的相互作用是否导致了一个能够促进断裂的薄弱区,从而容易造成侧翼不稳定。通过 FracPaQ 工具箱对断裂和样品尺度断裂进行成像的多尺度断裂定量分析,与岩石物理学和岩石力学实验相结合,对裂谷区内外的古斯特隆博利、万科里、新斯特隆博利、皮佐和现沉积火山周期的厘米尺度样品进行了研究。结果表明,玄武岩纹理、微裂缝密度、孔隙度、化学分区和优先排列,尽管与岩性有关,但在区域尺度上与东北/西南薄弱区有关,并与受到持续侵入活动影响的塌陷区有关。通过数值建模,还建立了微裂缝密度与地震速度之间的联系,从而可以从裂缝程度的角度解释实地地震层析成像的结果,为火山内部结构的裂缝破坏演变提供了一种新的成像方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multiscale fracture, physical and mechanical properties of stromboli volcano (Italy) edifice

The physical, mechanical and fracture properties at Stromboli volcano have been integrated at multiple scales to understand whether the interplay between a presumed NE/SW rift zone and the Sciara del Fuoco (SDF) depression has resulted in a zone of weakness able to promote fracturing prone to flank instability. Multiscale fracture quantification by imaging via FracPaQ toolbox both fractures and sample scale fractures has been integrated with rock physics and rock mechanics experiments on cm-scale samples belonging to the Paleostromboli, Vancori, Neostromboli, Pizzo and Present Deposit volcanic cycles that have been taken from within and outside the rift zone. The structural changes to the edifice have been quantitively assessed by mapping at different scale fracture properties such density and orientation within and outside the rift zone allowing to identify the potential damaged zones that could reduce the edifice strength.

Results indicate that basalt textures, microfracture density, porosity, chemical zoning and preferential alignments, despite lithologically dependent, can be related to the NE/SW zone of weakness at the regional scale and to collapsed volumes that have been subject to continuous intrusive activity. Numerical inversion models have been performed to cross correlate fracture density in the basalts at multiple scales.

A link between microfracture density and seismic velocities has been also established via numerical modelling, allowing to interpret in terms of degree of fracturing the results of seismic tomographies at the field scale, providing a novel method to image crack damage evolution within the inner structure of the volcano edifice.

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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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