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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Intrusive mechanism of the 2008-2009 Mt. Etna eruption: Constraints by tomographic images and stress tensor analysis
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Intrusive mechanism of the 2008-2009 Mt. Etna eruption: Constraints by tomographic images and stress tensor analysis

机译：2008-2009年山的侵入机制。埃特纳火山喷发：断层图像和应力张量分析的限制

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摘要

Since January 2008, several geophysical parameters have evidenced a recharging phase at Mt. Etna volcano culminating with an effusive eruption that began on May 13, 2008. Seismic activity recorded at Mt. Etna from January 2007 to May 2008 was analyzed in order to provide seismological constraints to the volcano dynamics leading to the eruption. A total of 336 selected earthquakes, with M_L≧ 1.5, were used as data source for this study. Specifically, we calculated 3D velocity and attenuation tomography, including a 3D relocation of the events, and we computed 53 selected fault plane solutions (FPSs) that were used for stress tensor inversion. The most important result obtained from the joint analysis of V_p, V_p/V_s and P-wave attenuation is an anomalous zone with normal to high V_p (values between 3.5 and 4.5 km/s) and low V_p/V_s (values ≦ 1.64), which partially overlaps with a low Q_p (values ≦ 50) volume located along a NS trending channel beneath the central crater. This can be interpreted as a shallow volume characterized by high temperature where the magma is located with the presence of supercritical fluids. The analysis of seismic stress tensor evidenced an extensional regime in the depth range 3-13 km with a vertically oriented O_1. This finding may suggest an extensional stress regime, probably related to the kinematic response of the volcanic edifice to both a deep magmatic intrusion and a condition of decreased regional compressive stress facilitated by sliding processes of the eastern flank of the volcano.
机译：自2008年1月以来，一些地球物理参数已证明在山山处于充电阶段。埃特纳火山到2008年5月13日开始爆发喷发。为了对导致火山爆发的火山动力学提供地震学限制，对2007年1月至2008年5月的埃特纳火山进行了分析。总共选择了336个M_L≥1.5的地震作为本研究的数据源。具体来说，我们计算了3D速度和衰减层析成像，包括事件的3D重定位，并计算了53个用于应力张量反演的选定断层平面解（FPS）。从V_p，V_p / V_s和P波衰减的联合分析中获得的最重要结果是一个异常区域，其异常区域具有高到高的V_p（值介于3.5和4.5 km / s之间）和低的V_p / V_s（值≤1.64），它沿着中央火山口下方的NS趋势通道与低Q_p（值≤50）体积部分重叠。这可以解释为以高温为特征的浅层体积，在超临界流体存在的情况下岩浆所在的位置。地震应力张量的分析表明，在深度范围为3-13 km的情况下，O_1为垂直取向。这一发现可能暗示了一种伸展应力状态，可能与火山岩体对深部岩浆侵入的运动学响应以及火山东翼滑动过程促进的区域压应力降低的条件有关。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2012年第1期|p.50-63|共14页
  • 作者

    Salvatore Alparone; Graziella Barberi; Ornella Cocina; Elisabetta Giampiccolo; Carla Musumeci; Domenico Patane;

  • 作者单位

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania - Osservatorio Etneo, Piazza Roma 2, 95123 Catania, Italy,Institute Andaluz de Geofisica, Campus Universitario de Cartuja s, Universidad de Granada, 18071 Granada, Spain;

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  • 正文语种 eng
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  • 关键词

    mt. etna; volcanic eruptions; stress tensor; velocity tomography; attenuation tomography;

    机译：公吨。埃特纳火山喷发;应力张量速度层析成像衰减层析成像;

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