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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Active spreading and regional extension at Mount Etna imaged by SAR interferometry
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Active spreading and regional extension at Mount Etna imaged by SAR interferometry

机译：SAR干涉仪在埃特纳火山的主动扩散和区域扩展

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Large-flank instability has been proposed by most recent authors as a major process in the dynamics of Mount Etna. However, several aspects of the models are still disputed, such as the boundaries of the moving area and the driving force for the instability. In this paper we present synthetic aperture radar interferometric data which allow us to identify two main sectors of active instability where the deformational process differs. An eastern sector is bounded to the north by the Pernicana-Provenzana fault, to the west by the North Rift Zone and the South Rift Zone and to the south by the Mascalucia-Tremestieri-Trecastagni fault system. Interferograms provide new data on the activity and extent of the southern boundary, which was previously underestimated. In this sector the structural features indicate an eastward sliding, driven by E-W regional extension, which can be interpreted as a result of the retreating slab of the Ionian subduction. A second collapsing sector exists along the southern flank of Mount Etna, where the interferograms show the presence of an active anticlinal ridge. This ridge is interpreted as the result of southward gravity spreading over a basal decollement between Etna and its Plio-Quaternary basement and the Hyblean platform. The two sectors first became active in summer 1996, after the beginning of a new cycle of eruptive activity at the summit. The activity was ongoing until January 1998, with the deformation rate ranging from 4-6 mm/yr for the Mascalucia-Tremestieri-Trecastagni faults to 12 mm/yr for the anticlinal ridge.
机译：最近的作者已经提出大侧面不稳定性是埃特纳火山动力学的主要过程。但是，模型的几个方面仍存在争议，例如运动区域的边界和不稳定的驱动力。在本文中，我们介绍了合成孔径雷达干涉测量数据，这些数据使我们能够确定变形过程不同的两个主要主动失稳扇区。东部是北部的佩尔尼卡纳-普罗旺萨纳断裂带，北部是北裂谷带和南裂谷带，南部是马斯卡鲁西亚-特雷梅斯特里-特雷卡斯塔尼断裂系统。干涉图提供了以前被低估的有关南部边界活动和范围的新数据。在该区域，结构特征表明了由E-W区域扩展带动的向东滑动，这可以解释为爱奥尼亚俯冲的后退平板的结果。沿着埃特纳火山的南部侧面存在第二个塌陷区，那里的干涉图表明存在活跃的脊背脊。该山脊被解释为向南重力分布在埃特纳火山及其上空第四纪基底和海布里安平台之间的基底挠曲上。在首脑会议开始新一轮爆发活动之后，这两个部门于1996年夏季首次活跃起来。活动一直持续到1998年1月，变形速度从Mascalucia-Tremestieri-Trecastagni断层的4-6 mm / yr到背斜脊的12 mm / yr不等。

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