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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Tectonic control on the eruptive dynamics at Mt. Etna Volcano (Sicily) during the 2001 and 2002-2003 eruptions
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Tectonic control on the eruptive dynamics at Mt. Etna Volcano (Sicily) during the 2001 and 2002-2003 eruptions

机译：山顶喷发动力学的构造控制。埃特纳火山（西西里岛）在2001年和2002-2003年爆发

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摘要

The eruptive events of the July-August 2001 and October 2002-January 2003 at Mt. Etna provide new insights for reconstructing the complex geometry of the feeding system and their relationship to regional tectonics. The 2001 eruption took place mainly on the upper southern sector of the volcano. The eruption was preceded by a large earthquake swarm for a few days before its onset and accompanied by ground deformation and fracturing. The development of surface cracking along with the seismic pattern has allowed us to recognize three distinct eruptive systems (the SW-NE, NNW-SSE and N-S systems) which have been simultaneously active. Such eruptive systems are only the upper portions of a complex feeding system that was fed at the same time by two distinct magmas. The SW-NE and NNW-SSE systems, connected with the SE crater conduit, were fed by magma coming from depth, whereas the N-S system served instead as an ascending pathway for an amphibole-bearing magma residing in a shallow reservoir. The eruptive activity started again on October 2002 on the NE Rift Zone, where about 20 eruptive vents were aligned between 2500 and 1900 m a.s.L, and on the southern flank, from the central crater to the Montagnola. The onset of eruptive activity was accompanied by a seismic swarm. As in the 2001 eruptive event, two independent feeding systems formed, characterized by distinct magmas. The SW-NE system controlled the feeding of the Northeast Rift and was accommodated by left-lateral displacement along the WNW-ESE trending Pernicana Fault. The N-S system fed the eruptions on the southern flank. Moreover, the associated crustal deformation triggered seismic reactivation of tectonic structures in the eastern flank of the volcano and offshore. These two last eruptions indicate that at Mt. Etna the ascent of magma, as well as the accommodation of deformation, is strongly dominated by local extensional structures that are connected to a regional tectonic regime.
机译：2001年7月至8月和2002年10月至2003年1月在山顶的喷发事件。埃特纳火山提供了新的见解，可用于重建饲养系统的复杂几何形状及其与区域构造的关系。 2001年的喷发主要发生在火山的南部地区。火山爆发前几天爆发了大片地震，并伴有地面变形和破裂。表面裂缝的发展以及地震模式使我们认识到了三个同时活跃的不同喷发系统（SW-NE，NNW-SSE和N-S系统）。这样的喷发系统只是复杂的进食系统的上部，该系统由两个不同的岩浆同时进给。与SE火山口导管相连的SW-NE和NNW-SSE系统由来自深处的岩浆供给，而N-S系统则作为浅层储层中含闪石的岩浆的上升通道。喷发活动于2002年10月再次在NE裂谷带开始，在大约2500至1900 m a.s.L之间，从中央火山口到蒙塔尼奥拉，在南部的翼缘排列了约20个喷发口。爆发性活动的发生伴随着地震群。与2001年爆发事件一样，形成了两个独立的饲喂系统，其特征是岩浆不同。 SW-NE系统控制了东北裂谷的进给，并沿WNW-ESE趋向的Pernicana断层由左向位移提供。 N-S系统为南部侧面的爆发提供了动力。此外，伴随的地壳变形触发了火山东侧和近海构造构造的地震再活化。这最后两次喷发表明在山顶。埃特纳火山岩浆的上升以及变形的适应主要由与区域构造体系相关的局部伸展构造主导。

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