Abstract

It is shown that the rate of explosive eruptions on Shiveluch Volcano has become increasingly high during recent years, which makes the monitoring of the volcano using all available means highly urgent. We seek to introduce another technique into the multidisciplinary monitoring of explosive eruptions by analyzing responses in the vertical component of the atmospheric electric field (E_Z AEF) during the passage of eruptive plumes. We considered two Shiveluch eruptions that were different in vigor that occurred on December 16, 2016 and on June 14, 2017.The signals in the E_Z AEF were selected using multidisciplinary observations, viz., satellite-based observations, seismic, and infrared observations. Signals of negative polarity were recorded in the E_Z AEF dynamics in the near zone (<50 km) for both eruptions at once as ash began to fall. In the first of these cases, the ash–air plume was “dry”; thus, the aero-electrical structure was of the “negatively charged plume” type. The intense explosion that occurred in the second of these cases sent a great amount of ash and volcanic gases into the atmosphere, with 98% being steam; the result was a dipole aero-electrical structure due to eolian differentiation in the near zone. In the far zone (>100 km), the explosion produced a signal of positive polarity coming from an aero-electrical structure of the “positively charged plume” type from the aerosol column.

中文翻译：

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Shiveluch火山喷出的羽状羽化的电气化与负责任爆炸特性的关系

摘要

事实表明，近年来，希鲁卢奇火山上的爆炸爆发率变得越来越高，这使得使用所有可用手段进行火山监测变得非常紧迫。我们试图通过分析爆发羽流通过期间大气电场垂直分量（E _Z AEF）的响应，将另一种技术引入爆炸爆发的多学科监测。我们认为，均是2016年12月16日和6月14日发生的活力不同的两个舍维留奇火山喷发，在2017.The信号é _ž利用多学科观测，即选择AEF，基于卫星的观测，地震和红外观测。负极信号记录在灰烬开始下降时，两次喷发在附近区域（<50 km）的E _Z AEF动态。在这些情况的第一种情况中，灰烬气羽是“干燥的”。因此，航空电气结构为“负电荷羽流”类型。在第二起案件中发生的强烈爆炸将大量的灰分和火山气体排入大气，其中98％为蒸汽；结果是由于附近区域的风积作用而形成了偶极航空电子结构。在较远的区域（> 100 km），爆炸产生的正极性信号来自气溶胶柱中“带正电羽流”类型的航空电气结构。