首页> 外文期刊>Journal of Volcanology and Geothermal Research >Structural control of collapse events inferred by self-potential mapping on the Piton de la Fournaise volcano (La Réunion Island)
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Structural control of collapse events inferred by self-potential mapping on the Piton de la Fournaise volcano (La Réunion Island)

机译:通过自电位映射在皮埃尔·德·富尔纳瓦火山(留尼汪岛)上推断的倒塌事件的结构控制

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摘要

Field surveys were performed on the terminal cone of Piton de la Fournaise in 2006 and 2008 to precisely map the self potential (SP) signal and determine the zonation of the hydrothermal activity both on the flanks of the cone and in the summit area, including inside the Bory and Dolomieu craters. SP maps inside the craters have been performed 8 months before the 5-7 April 2007 caldera collapse. Zonations appear both at the scale of the cone and of the summit and allow new interpretation of the electrical signal distribution on the terminal cone of Piton de la Fournaise. Superimposed to the SP maxima linked to the rift-zones, several areas of SP maxima associated with collapse structures have been detected: (1) in the summit area, the Bory and Dolomieu craters show the strongest SP values with amplitudes exceeding 2 V with respect to the base of the cone, and with a sharp lateral variation to the East, corresponding to the inner boundary of the Dolomieu caldera, collapsed on 5-7 April 2007, and (2) in the paleo pit craters surrounding the summit which show amplitudes similar to the Dolomieu-Bory craters. The analysis of the variations of the signal with time evidences a modification of the fluid flow pattern with a higher associated SP signature to the east in 2008. We interpret the amplification of fluid flow to the east in 2008 as a consequence of the eastward motion of the eastern flank of the volcano during the April 2007 eruption. The acquisition of SP data during two periods separated by the April 2007 eruption turns out to be a good opportunity to correlate the SP signal to the Piton de la Fournaise structure and to its evolution in term of hydrothermal and eruptive activity.
机译:在2006年和2008年对Piton de la Fournaise的末端锥进行了实地调查,以精确绘制自电势(SP)信号,并确定锥侧面和顶峰区域(包括内部)的热液活动分区。 Bory和Dolomieu火山口。在2007年4月5日至7日破火山口坍塌之前的8个月内,已经绘制了火山口内部的SP图。分区不仅显示在圆锥体的尺寸上,而且还出现在山顶的尺寸上,可以重新解释Piton de la Fournaise末端圆锥体上的电信号分布。与裂谷区相连的SP最大值叠加了一些与塌陷结构相关的SP最大值区域:(1)在山顶区域,Bory和Dolomieu火山口显示出最强的SP值,相对于振幅超过2 V到圆锥体的底部,并且与东方有明显的横向变化,对应于Dolomieu破火山口的内部边界,于2007年4月5日至7日坍塌,并且(2)在山顶周围的古坑火山口中显示出振幅类似于Dolomieu-Bory陨石坑。对信号随时间变化的分析表明,在2008年,流体流动模式发生了变化,伴有向东的相关SP信号较高。我们解释了由于向东运动导致2008年向东部的流体流动放大。在2007年4月喷发期间,火山的东翼。事实证明,在由2007年4月喷发分开的两个时期内,获取SP数据是一个很好的机会,可以将SP信号与Piton de la Fournaise结构及其在水热和喷发活动方面的演变联系起来。

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    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France,Institute de Ciencias de la Tierra Jaume Almera (CS1C Barcelona), Barcelona, Spain;

    Laboratoire GéoSciences Reunion, Université de la Reunion, Institut de Physique du Globe de Paris, Sorbonne Paris-Cité, UMR CNRS 7)54, 15 avenue Rene Cassin,BP 97715 Saint-Denis cedex 9, La Réunion, France;

    Institut de Physique du Globe de Paris et Université Paris Diderot, Sorbonne Paris-Cité, UMR CNRS 7154- Géologic des Systèmes Volcaniques, 1 rue Jussieu, 75238 Paris cedex 05, France.;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France,Laboratoire GéoSciences Reunion, Université de la Reunion, Institut de Physique du Globe de Paris, Sorbonne Paris-Cité, UMR CNRS 7)54, 15 avenue Rene Cassin,BP 97715 Saint-Denis cedex 9, La Réunion, France;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France,Laboratoire GéoSciences Reunion, Université de la Reunion, Institut de Physique du Globe de Paris, Sorbonne Paris-Cité, UMR CNRS 7)54, 15 avenue Rene Cassin,BP 97715 Saint-Denis cedex 9, La Réunion, France;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France,Ecole et Observatoire des Sciences de la Terre, Universite Louis Pasteur, Strasbourg, France;

    Ecole et Observatoire des Sciences de la Terre, Universite Louis Pasteur, Strasbourg, France;

    Ecole et Observatoire des Sciences de la Terre, Universite Louis Pasteur, Strasbourg, France;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France;

    Laboratoire Magmas et Volcans, Univ. Blaise Pascal-CNRS-OPCC, 5 rue Kessler, 63038 Clermont-Ferrand, France;

    Ecole et Observatoire des Sciences de la Terre, Universite Louis Pasteur, Strasbourg, France;

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