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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Tornillos at Vulcano: Clues to the dynamics of the hydrothermal system
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Tornillos at Vulcano: Clues to the dynamics of the hydrothermal system

机译：Vulcano的Tornillos：热液系统动力学的线索

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摘要

The number of tornillo events has recently increased at the Vulcano Island, Italy. While only 15 tornillos were recorded during 2004-2006,584 events occurred in 2007-2008. They were located just below La Fossa Crater at depths ranging between 0.1 and 1 km b.s.l. During two intervals in 2007-2008 increases in the number of tornillos took place at the same time as temperature and geochemical anomalies were observed. The spectral content of the tornillos, generally characterized by one-two dominant spectral peaks near 6 and 10 Hz, varied over time, with changes also noted in the quality factors. The simplest source mechanism proposed for tornillos is the free eigenvibration of a fluid volume within a crack or a conduit. Based on this model, we propose a causal relationship between the temperature and geochemical anomalies and the increases in numbers of tornillos. As the amount of hydrothermal fluids increases during the anomalies, the upward flux of fluids grows. The consequent changes in the pressure, temperature and dynamics of the system of cracks and conduits result in the generation of tornillos. Based on the fluid-filled crack/conduit model, the shallow depths of the sources and the values of the quality factors, the fluid within the resonant crack/conduit was inferred to be an ash-gas or water droplet-gas mixture. Moreover, the observed variations in the wavefield can be caused by small changes in the location of the source, in the source mechanism, or in the medium in between the source and the seismic station. Finally, another peculiar feature of tornillos is the amplitude modulation that can be explained as a result of a beating phenomenon.
机译：意大利伏尔卡诺岛的龙卷风事件数量最近有所增加。虽然在2004-2006年期间仅记录了15幅龙卷风，但在2007-2008年发生了584起事件。它们位于La Fossa火山口下方，深度在0.1至1 km b.s.l.之间。在2007年至2008年的两个时间间隔内，随着观察到温度和地球化学异常，龙卷风的数量同时增加。玉米饼的光谱含量通常以6 Hz和10 Hz附近的两个主要光谱峰为特​​征，随时间变化，质量因子也有所变化。提出用于龙卷饼的最简单的源机制是裂缝或导管内流体体积的自由本征振动。基于该模型，我们提出了温度与地球化学异常与龙卷风数量增加之间的因果关系。随着异常期间水热流体的数量增加，流体的向上通量增加。裂缝和导管系统的压力，温度和动力学的随之变化导致了龙卷风的产生。基于充满流体的裂缝/管道模型，震源的浅深度和品质因数的值，可以推断共振裂缝/管道内的流体是灰烬-气体或水滴-气体的混合物。此外，在波场中观察到的变化可能是由震源位置，震源机制或震源与地震台之间的介质中的微小变化引起的。最后，玉米粉圆饼的另一个独特特征是振幅调制，这可以由打浆现象来解释。

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  • 来源
    《Journal of Volcanology and Geothermal Research》 |2010年第4期|p.377-393|共17页
  • 作者

    Vincenzo Milluzzo; Andrea Cannata; Salvatore Alparone; Salvatore Gambino; Margaret Hellweg; Placido Montalto; Laura Cammarata; Iole Serena Diliberto; Stefano Gresta; Marcello Liotta; Antonio Paonita;

  • 作者单位

    Dipartimento di Srienze Geologiche, Universita di Catania, Corso Italia 57, 95129 Catania, Italy,Eni S.p.A. Divisione Exploration & Production, via Emilia 1, 20097 San Donato Milanese, Italy;

    rnIstituto Nazionale di Ceofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    rnIstituto Nazionale di Ceofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    Istituto Nazionale di Ceofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    Berkeley Seismological Laboratory, University of California at Berkeley, Berkeley, CA, USA;

    Istituto Nazionale di Ceofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy,Dipartimento di Ingegneria Elettrica, Elettronica e dei Sistemi, Universita di Catania, Viale Andrea Doria 6, 95125 Catania, Italy;

    Istituto Nazionale di Ceofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    lstituto Nazionale di Ceofisica e Vukanologia, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy;

    Dipartimento di Srienze Geologiche, Universita di Catania, Corso Italia 57, 95129 Catania, Italy;

    lstituto Nazionale di Ceofisica e Vukanologia, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy;

    lstituto Nazionale di Ceofisica e Vukanologia, Sezione di Palermo, Via Ugo La Malfa 153, 90146 Palermo, Italy;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    tornillos; volcano seismology; vulcano island; hydrothermal system;

    机译：玉米饼;火山地震学武尔卡诺岛水热系统;

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