Natale Jacopo, Vitale Stefano
Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari Aldo Moro, Bari, Italy.
Dipartimento di Scienze della Terra, dell'Ambiente e delle Risorse (DiSTAR), Università di Napoli Federico II, Napoli, Italy.
Nat Commun. 2025 Aug 18;16(1):7658. doi: 10.1038/s41467-025-62636-7.
In this work, we reconstruct the geometry and magma properties of the dyke that fed the Nisida eruption (~3.9 ka), located across the rim of the Campi Flegrei caldera (Italy). Results indicate that the magmatic overpressure was ~35 MPa, the dyke depth of origin was at ~5-6 km, consistent with petrologic studies, and the volume of the active magma chamber was 85-150 km with an upper bound of excess pressure rupture threshold of ~9 MPa. We show that a range between 4-9 MPa is common among the moderate-sized volcanic eruptions vented along caldera structures, suggesting a shared magma reservoir. Considering the volume change required to reach the rupture threshold, we simulate the ground deformation pattern triggered by such magma recharge, which produces a different and thus distinguishable geodetic signal compared to the currently observed one. This work may serve as a reference for identifying the transition from magma-driven unrest to volcanism at Campi Flegrei.
在这项工作中，我们重建了位于意大利坎皮佛莱格瑞火山口边缘的、为尼西达火山喷发（约3900年前）供浆的岩脉的几何形状和岩浆属性。结果表明，岩浆超压约为35兆帕，岩脉的起源深度约为5 - 6千米，这与岩石学研究结果一致，活动岩浆房的体积为85 - 150立方千米，超压破裂阈值的上限约为9兆帕。我们表明，4 - 9兆帕的范围在沿火山口结构喷发的中等规模火山喷发中很常见，这表明存在共享的岩浆库。考虑到达到破裂阈值所需的体积变化，我们模拟了这种岩浆补给引发的地面变形模式，与目前观测到的模式相比，它会产生不同且可区分的大地测量信号。这项工作可为识别坎皮佛莱格瑞从岩浆驱动的动荡向火山活动的转变提供参考。
