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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Radon mapping, automatic measurements and extremely high ~(222)Rn emissions during the 2002-2007 eruptive scenarios at Stromboli volcano
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Radon mapping, automatic measurements and extremely high ~(222)Rn emissions during the 2002-2007 eruptive scenarios at Stromboli volcano

机译：Stromboli火山2002-2007年喷发期间的mapping测图，自动测量和极高的〜（222）Rn排放

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摘要

We report additional radon data collected at Stromboli during 2002-2007. The whole data set of periodic measurements has been systematically analyzed to retrieve the values of background, threshold and anomaly for all the stations of the network. Maps of radon concentrations in space and time correlate with changes in volcanic activity. Higher radon emissions are essentially concentrated at summit stations and may also affect some stations located onto the summit-eastern sector of the cone (along the N60°E fracture zone), as well as two stations placed at the NE edge of Sciara del Fuoco. Most of these stations are well above their threshold values during effusive eruptions (namely 2002-2003 and 2007) due to the progressive structural adjustment of the volcano edifice coupled with the opening and resetting of the fracture network. A two-year-long timeseries of automatic ~(222)Rn measurements (2005-2007) was analyzed together with local environmental parameters and selected geophysical data (on seismic tremor and infrasonic puffing). The data show good correlation between radon and the latter parameters particularly during periods of high Strombolian activity (March-April 2006), and before the onset of the February 27,2007 lava effusion (with radon emissions being well above 20,000 Bq/m~3). Extremely high radon emissions (up to -1.7 × 10~6 Bq/m~3) were recorded along the fractures of the SW crater during the first two months of the 2002-2003 effusive eruption. Very high radon emissions (up to -470,000 Bq/m~3 for ~(222)Rn, and -780,000 Bq/m~3 for ~(220)Rn, respectively) were also detected by the automatic measurements at the summit station during June 20-early July 2007: i.e., just prior to the resuming of the Strombolian activity at summit craters. These data give us the opportunity to estimate the relative depths of the summit fractures during fracturing (being constrained between 200 and 310 m). This is in good agreement with the hypocentral depths of the so called "hybrid events" and the source of the very long period seismic signals (VLP) localized at a depth of about 500 m a.s.l. below the upper-central part of the Sciara del Fuoco.
机译：我们报告了2002-2007年在Stromboli收集的其他ra数据。定期测量的整个数据集已经过系统地分析，以检索网络所有站点的背景，阈值和异常值。 space在空间和时间上的分布图与火山活动的变化有关。较高的ra气排放基本上集中在山顶站，还可能影响位于圆锥顶山东段（沿N60°E断裂带）的一些站，以及位于Sciara del Fuoco东北边缘的两个站。在火山喷发期间（即2002-2003年和2007年），由于火山大厦的渐进式结构调整以及裂缝网络的打开和重置，这些站点中的大多数都远远高于其阈值。分析了一个为期两年的自动〜（222）Rn测量的时间序列（2005-2007），以及局部环境参数和选定的地球物理数据（关于地震震颤和次声膨胀）。数据显示ra与后者参数之间具有良好的相关性，特别是在高Strombolian活动期间（2006年3月至4月）以及2007年2月27日熔岩喷出开始之前（with的排放量远高于20,000 Bq / m〜3）。 ）。在2002-2003年喷发性火山喷发的头两个月，沿西南陨石坑的裂缝记录到极高的ra气排放（高达-1.7×10〜6 Bq / m〜3）。在峰会期间，通过自动测量还检测到非常高的ra气排放（〜（222）Rn分别高达-470,000 Bq / m〜3和〜（220）Rn分别高达-780,000 Bq / m〜3）。 2007年6月20日至7月初：即在Strombolian活动在山顶火山口恢复活动之前。这些数据使我们有机会估算压裂过程中顶峰裂缝的相对深度（限制在200至310 m之间）。这与所谓的“混合事件”的震中深度和定位在约500 m a.s.l.深度的超长周期地震信号（VLP）的来源非常吻合。在Sciara del Fuoco的中上部分下方。

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    C. Cigolini; M. Laiolo; G. Ulivieri; D. Coppola; M. Ripepe;

  • 作者单位

    Dipartimento di Scienze delta Terra, Universita di Torino, Via Valperga Caluso 35, 10125 Torino, Italy NatRisk, Centro Interdipartimentale sui Rischi Naturali in Ambiente Montana e Collinare, Universita' degli Studi di Torino, Italy Dipartimento di Scienze della Terra, Universita di Torino, Via Valperga Caluso 35,10125 Torino, Italy;

    Dipartimento di Scienze delta Terra, Universita di Torino, Via Valperga Caluso 35, 10125 Torino, Italy;

    Dipartimento di Scienze delta Terra, Universita di Firenze, Via La Pira 4,50121 Firenze, Italy;

    Dipartimento di Scienze delta Terra, Universita di Torino, Via Valperga Caluso 35, 10125 Torino, Italy;

    Dipartimento di Scienze delta Terra, Universita di Firenze, Via La Pira 4,50121 Firenze, Italy;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Radon; Automatic measurements; Volcanic activity; Geophysical parameters;

    机译：氡;自动测量;火山活动;地球物理参数;

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