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New insights into the local crust structure of Mt. Etna volcano from seismological and morphotectonic data

机译:对山地壳结构的新见解。埃特纳火山的地震学和构造构造数据

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摘要

The reconstruction of the extensional active tectonic structures on the eastern flank of Mt. Etna and of the related earthquakes, allowed the analysis of fault parameters for more than 50 episodes of coseismic ground rupture for the last 250 years. The calculation of statistical relationships among earthquake magnitude, surface rupture length, surface fault displacement and their combination was performed. Moreover we found out that the minimum earthquake magnitude to have ground rupture effect is ca. 2.5. We were therefore able to hypothesize a reduced seismogenic layer (5-6 km) under the lower eastern flank of the volcano. We also analysed structural and marine geology data to find further surface evidences of the volcano dynamics. We recognized for the first time a local component of uplift affecting the volcanic domain at least in the last 20 ka with a rate up to 3.5 mm/yr that is likely related to a volcanic dome effect. Coupling the two aspects, the seismological one and the morphostructural one, of our research we propose a local thinning of the brittle crust in this sector of Mt. Etna. The thermal effects of the uprising magma on the rheology of the crust rocks well explain all our observations.
机译:富士山东翼伸展活动构造构造的重建。埃特纳火山(Etna)和相关的地震使得过去250年中50多次同震地面破裂的断层参数分析成为可能。进行了地震烈度,地表破裂长度,地表断层位移及其组合之间统计关系的计算。此外,我们发现具有地面破裂效应的最小地震震级为。 2.5。因此,我们能够在火山的下东翼下方假设一个减少的地震成因层(5-6公里)。我们还分析了结构和海洋地质数据,以寻找火山动力学的进一步表面证据。我们首次认识到至少在最近20 ka内,局部隆升影响火山区域,速率高达3.5毫米/年,这可能与火山穹顶效应有关。结合我们研究的地震学和形态结构学这两个方面,我们提出在该山地区该地区的脆性壳局部变薄。埃特纳火山。起义岩浆对地壳岩石流变性的热效应很好地解释了我们的所有观察结果。

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