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首页> 外文期刊>Journal of Volcanology and Geothermal Research2012V243-244NOCT,15 >The buried caldera boundary of the Vesuvius 1631 eruption revealed by present-day soil CO_2 concentration
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The buried caldera boundary of the Vesuvius 1631 eruption revealed by present-day soil CO_2 concentration

机译：VESUVIUS 1631爆发的埋地火山口爆发，目前的土壤CO_2浓度揭示

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摘要

Volcanic risk at Vesuvius is one of the highest in the world due to the similar to 670,000 inhabitants living in the Red Zone, the area exposed to both pyroclastic flows and tephra fallout, to be evacuated before renewal of any eruptive activity. The national emergency plan for Vesuvius builds its risk zonation on a scenario similar to the last sub-Plinian eruption, which occurred in 1631. This study aims at providing new insights on the geometry of the caldera associated with this historical eruption. The impact of past Vesuvius eruptions on present-day soil CO2 concentration has been investigated by means of an extended geochemical survey carried out for identifying the circulation pathways of hydrothermal fluids inside the volcano. We performed 4018 soil CO2 concentration measurements over the whole Somma-Vesuvius volcanic complex, covering an area of 50 km(2). Besides relatively low values, the results show a significant spatial CO2 concentration heterogeneity over Somma-Vesuvius ranging from the atmospheric value (similar to 400 ppm) up to similar to 24,140 ppm. The summit of Vesuvius shows an area with anomalous CO2 concentrations well matching the crater rim of the 1906 eruption. Along the cone flanks, secondary CO2 anomalies highlight a roughly circular preferential pathway detected along 8 radial profiles at distances between similar to 840 m and similar to 1150 m from the bottom of the present-day crater resulting from the last eruption in 1944. In depth review of the available literature highlights an agreement between this circle-like shaped anomaly and the 1631 sub-Plinian eruption caldera boundary. Indeed, based on the historical chronicles the depression produced by the 1631 eruption had a diameter of 1686 m, whereas the CO2 circular anomaly indicates a diameter of 1956 m. Finally, the results were compared with a 3-D density model obtained from a recent gravity survey that corroborates both the literature and the CO2 data in terms of potential buried structure at the base of the Vesuvius cone. (C) 2019 Elsevier B.V. All rights reserved.
机译：VESUVIUS的火山风险是世界上最高的风险，由于670,000名居住在红区，暴露于杂交流动和TPHRA辐射的区域，在更新任何爆发活动之前将被疏散。 VESUVIUS国家应急计划在类似于上次亚普林爆发的情况下建立了其风险区划，这是在1631年发生的最后一次发生的场景。本研究旨在为与这一历史爆发相关的火山口的几何形状提供新的见解。通过对鉴定火山内的水热流体的循环途径进行了扩展的地球化学调查，研究了过去VESUVIUS爆发对本日土壤CO2浓度的影响。我们对整个Somma-VESUVIUS火山复合物进行了4018种土壤CO2浓度测量，覆盖了50公里（2）的面积。除了相对较低的值之外，结果表明，通过氧美体值（类似于400ppm）至24,140ppm的大气压值（类似于400ppm），显着的空间CO 2浓度异质性。 VeSuvius的峰会显示了一个具有异常CO2浓度的区域，它良好匹配1906次喷发的火山口框。沿着锥形侧翼，次级CO2异常突出了沿着8个径向剖面检测到的大致圆形优先途径，在类似于840米的距离，距1944年最后一次喷发的当前火山口底部的1150米。深入审查可用文献突出了该圆形异常的异常与1631个子普林喷发火山口边界之间的协议。实际上，基于历史记录的抑郁症，由1631喷发产生的抑郁症的直径为1686米，而CO2圆形异常表明直径为1956米。最后，将结果与最近的重力调查获得的3D密度模型进行了比较，以便在VESUVIUS锥体基部的潜在埋地结构方面证实文献和CO2数据。 （c）2019 Elsevier B.v.保留所有权利。

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    Poret M.; Finizola A.; Ricci T.; Ricciardi G. P.; Linde N.; Mauri G.; Barde-Cabusson S.; Guichet X.; Baron L.; Shakas A.; Gouhier M.; Levieux G.; Morin J.; Roulleau E.; Sortino F.; Vassallo R.; Di Vito M. A.; Orsi G.;

  • 作者单位

    Univ Clermont Auvergne Lab Magmas & Volcans CNRS IRD OPGC Clermont Ferrand France;

    Univ La Reunion Inst Phys Globe Paris Lab GeoSci Reunion CNRS UMR 7154 Sorbonne Paris Cite La Reunion France;

    Ist Nazl Geofis & Vulcanol Rome Italy;

    Ist Nazl Geofis & Vulcanol Osservatorio Vesuviano Naples Italy;

    Univ Lausanne Inst Earth Sci Appl & Environm Geophys Grp Lausanne Switzerland;

    Univ Neuchatel Ctr Hydrogeol & Geotherm Neuchatel Switzerland;

    Univ Clermont Auvergne Lab Magmas & Volcans CNRS IRD OPGC Clermont Ferrand France;

    IFP Energies Nouvelles Geosci Div Rueil Malmaison France;

    Univ Lausanne Inst Earth Sci Appl & Environm Geophys Grp Lausanne Switzerland;

    Univ Lausanne Inst Earth Sci Appl & Environm Geophys Grp Lausanne Switzerland;

    Univ Clermont Auvergne Lab Magmas & Volcans CNRS IRD OPGC Clermont Ferrand France;

    Minist Charg Environm Paris France;

    Univ Clermont Auvergne Lab Magmas & Volcans CNRS IRD OPGC Clermont Ferrand France;

    Univ Clermont Auvergne Lab Magmas & Volcans CNRS IRD OPGC Clermont Ferrand France;

    Ist Nazl Geofis & Vulcanol Palermo Italy;

    Univ Grenoble Alpes Univ Savoie Mt Blanc CNRS IRD IFSTTAR ISTerre Grenoble France;

    Ist Nazl Geofis & Vulcanol Osservatorio Vesuviano Naples Italy;

    Univ Federico II Dipartimento Sci Terra Ambiente & Risorse Naples Italy;

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  • 关键词

    Somma-Vesuvius; Soil CO2 concentration; 1631 sub-Plinian eruption; Carbon dioxide; Caldera;

    机译：Somma-Vesuvius;土壤二氧化碳浓度;1631个亚普林喷发;二氧化碳;卡尔德岛;

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