The evolution of volcanic activity observed at the New South East Crater (NSEC) and Voragine (VOR) between July 2019 and January 2020 has been deciphered by taking into account the changes of textures and chemical zoning of plagioclase and olivine crystals from the erupted lavas and tephra. The petrological observations have been integrated with analyses of the amplitude and source location of volcanic tremor and infrasound data. Characteristics of crystals erupted on July 2019 at the NSEC reflect protracted intrusions of magma into the mid-upper section of the plumbing system, approximately within 290–120 MPa, which acted as the main zone of magma accumulation and crystallization before the beginning of the eruptive activity. Textures and compositions of crystals erupted at VOR emphasize the beginning of volcanic activity driven by recharge/discharge phases that mostly affect the shallowest portion of the Mt. Etna plumbing system (<40 MPa). At the end of 2019, mineral compositions and zoning patterns changed again in accordance with eruption dynamics. The observed changes reflect the transition from an early phase, between November and December 2019, characterized by substantial equilibrium during magma storage and transport toward higher disequilibrium conditions and eruptive frequency, in January 2020. This has been associated to episodes of deep replenishment of mafic magmas displacing the resident one. Diffusion chronometry applied to zoned olivines shows that most of the episodes of magma intrusion correlate temporally with changes in the features of both volcanic tremor and infrasonic events in terms of amplitude and source location, providing evidence that such geophysical signals are directly related to the magma dynamics in the upper plumbing system.

2019 年 7 月至 2020 年 1 月期间在新东南火山口 (NSEC) 和 Voragine (VOR) 观测到的火山活动演变已通过考虑到来自喷发的熔岩的斜长石和橄榄石晶体的质地和化学分带的变化而破译。火山。岩石学观测已与火山震颤和次声数据的幅度和震源位置分析相结合。2019 年 7 月在 NSEC 喷发的晶体特征反映了岩浆长期侵入管道系统中上段，大约在 290-120 MPa 范围内，是喷发开始前岩浆聚集和结晶的主要区域活动。在 VOR 喷发的晶体的质地和成分强调了由补给/放电阶段驱动的火山活动的开始，这些阶段主要影响山的最浅部分。Etna 管道系统 (<40 MPa)。2019 年底，矿物成分和分区模式再次根据喷发动态发生变化。观察到的变化反映了从早期阶段（即 2019 年 11 月至 12 月）的转变，其特征是岩浆储存和运输过程中的大量平衡在 2020 年 1 月向更高的不平衡条件和喷发频率转变。这与基性岩浆深度补充的事件有关取代居民之一。