Crustal stress pattern at Mt. Etna volcano

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Salvatore Scudero
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引用次数: 0

Abstract

Stress fields may exhibit variegated patterns, especially in volcanic areas where several processes superimpose their effects in space and time. The comprehension of such patterns may not be straightforward to investigate. This work investigates the pattern of the crustal stress in the area of Mt. Etna Volcano (Sicily, Italy). This has been possible through a collection of more than 800 stress indicators derived from seismological and volcanological/geological information. In particular, the type of collected data allows to consider, for the first time in this area, two different temporal steps in the evolution of Etna volcano: the present-day and the previous volcanic phase at 15 ka. Results indicate a transition between a background shallow NW-SE tensional regime and a deep SW-NE compressional one that occurs between 6 and 16 km depth and which well fits with the present-day geodynamic framework of the area. The occurrence of small-scale lateral variations is interpreted as the second-order effect of the structures of the active front buried beneath the volcano, to the volcano loading, and to the feeding system. The temporal variations in the area surrounding the volcano suggest a major rearrangement of the background stress field evidenced by the swap between minimum and maximum horizontal stress directions. Conversely, during the same period, the stress pattern in the exact correspondence of the volcanic edifice showed to be stable and with a radial arrangement. Such coherence would support the literature which suggests a long-term inflation process started at least 15 kyr ago.

埃特纳火山的地壳应力模式
应力场可能表现出多种多样的模式,特别是在火山地区,几个过程在空间和时间上叠加影响。要理解这种模式可能并不容易。这项工作研究了埃特纳火山(意大利西西里岛)地区的地壳应力模式。通过收集地震学和火山学/地质学信息得出的 800 多个应力指标,这项工作得以实现。特别是,所收集的数据类型首次允许在该地区考虑埃特纳火山演变过程中的两个不同时间步骤:现在和 15 ka 时的前一个火山阶段。研究结果表明,在 6 至 16 千米深度范围内,出现了西北-东南向浅层拉伸机制和西南-东北向深层压缩机制之间的过渡,这与该地区当今的地球动力框架十分吻合。小尺度横向变化的出现被解释为埋藏在火山下的活火山前沿结构对火山负荷和馈源系统的二阶效应。火山周围地区的时间变化表明,背景应力场发生了重大的重新安排,这从最小和最大水平应力方向的互换可以得到证明。相反,在同一时期,与火山结构完全对应的应力模式显示为稳定的径向排列。这种一致性支持了至少 15 千年前开始的长期膨胀过程的文献。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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