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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Seismological features of the Pernicana-Provenzana Fault System (Mt. Etna, Italy) and implications for the dynamics of northeastern flank of the volcano
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Seismological features of the Pernicana-Provenzana Fault System (Mt. Etna, Italy) and implications for the dynamics of northeastern flank of the volcano

机译：Pernicana-Provenzana断层系统（意大利埃特纳火山）的地震学特征及其对火山东北翼动力学的影响

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摘要

The Pernicana-Provenzana Fault System is one of the most active tectonic systems of Mt. Etna and it plays an important role in the dynamic of the eastern flank of the volcano. Earthquakes occurring close to this structural trend have reached magnitudes up to 4.2, sometimes with coseismic surface faulting, and have caused severe damages to tourist resorts and villages in the vicinity of this structure. In the last decade, a large number of shocks, sometimes in the form of swarms, linked to Pernicana-Provenzana Fault System movements have been detected by the permanent local seismic network operating in eastern Sicily. In this paper, we report on the detailed study of the seismic activity occurring during the 2000-2009 time span in the Pernicana-Provenzana Fault System area. Firstly, we located 407 earthquakes using a standard location code and a ID crustal velocity model. We then applied two different approaches to calculate precise hypocenter locations of the events. In particular, a non-linear code was adopted to obtain an estimate of the a posteriori Probability Density Function in 3D space for the hypocenter location. Moreover, a relative location of correlated event pairs was performed, using the double-difference method. These two different location approaches allowed defining with good accuracy, the most active and hazarding sectors of the structure. The results of these precise locations showed a tighter clustering in the epicenters and in focal depths, in comparison with standard locations. Earthquakes are located along the Pernicana-Provenzana Fault System, and are mainly clustered in two zones, separated by an area with very low rate of earthquakes occurrence, but characterized by the highest energy release. Depths of the foci are very shallow, ranging between the surface and about 3 km b.s.l. Kinematics of the Pernicana-Provenzana Fault System, revealed by the fault plane solutions computed for the most energetic earthquakes, highlights a predominant dip-slip and left strike movements along E-W oriented fault planes, in agreement with field observations.
机译：Pernicana-Provenzana断层系统是山中最活跃的构造系统之一。埃特纳火山（Etna）及其在火山东翼的动力中起着重要作用。接近该结构趋势发生的地震最高达到4.2级，有时还伴有同震表面断层，并且对该结构附近的旅游胜地和村庄造成了严重破坏。在过去的十年中，西西里岛东部的永久性本地地震台网发现了与Pernicana-Provenzana断层系统运动相关的大量震动，有时以群发形式。在本文中，我们报告了P​​ernicana-Provenzana断层系统地区2000-2009年间发生的地震活动的详细研究。首先，我们使用标准位置代码和ID地壳速度模型定位了407次地震。然后，我们应用了两种不同的方法来计算事件的精确震中位置。特别地，采用非线性代码来获得震源位置在3D空间中的后验概率密度函数的估计。此外，使用双差方法执行了相关事件对的相对位置。这两种不同的定位方法可以准确定义结构中最活跃和最危险的区域。这些精确位置的结果表明，与标准位置相比，震中和焦点深度的聚类更加紧密。地震沿Pernicana-Provenzana断层系统定位，并且主要聚集在两个区域中，被一个地震发生率极低但能量释放最高的区域隔开。震源深度很浅，介于地表和约3 km b.s.l.之间。 Pernicana-Provenzana断层系统的运动学，通过为最剧烈的地震计算出的断层平面解而揭示，与野外观测相一致，突出了沿EW断层平面的主要倾滑和左走向运动。

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  • 作者

    S. Alparone; O. Cocina; S. Gambino; A. Mostaccio; S. Spampinato; T.Tuve; A. Ursino;

  • 作者单位

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Osservatorio Etneo-Sezione di Catania, Piazza Roma, 2, 95125 Catania. Italy;

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  • 正文语种 eng
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  • 关键词

    etna volcano; pernicana-provenzana fault system; earthquakes; precise location; fault plane solutions; seismic strain release;

    机译：埃特纳火山pernicana-provenzana断层系统;地震;准确的位置;故障平面解决方案;地震应变释放;

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