研究人员使用深度学习算法对一个主要地幔地震群的结构进行检测成像，该地震群由2018年基拉韦厄火山爆发后迅速加速的近20万个事件组成。在36-43公里的深度范围内，研究组解析了一个15公里长的近水平席状构造的几何体并将其识别为一个岩床复合体。这些岩床通过一条25公里长的地震活动带与基拉韦厄火山通道以较低深度相连。
此外，一系列地震活动将岩床与莫纳罗亚火山附近的浅层滑脱断层联系起来，这些发现暗示了地幔岩床复合体夏威夷下方岩浆运输的纽带，并进一步表明了火山系统中岩浆的广泛连通性。
据介绍，夏威夷火山系统的深层岩浆结构对于理解岩浆重上地幔向单个火山的迁移十分重要。
附：英文原文
Title: The magmatic web beneath Hawai‘i
Author: John D. Wilding, Weiqiang Zhu, Zachary E. Ross, Jennifer M. Jackson
Issue&Volume: 2022-12-22
Abstract: The deep magmatic architecture of the Hawaiian volcanic system is central to understanding the transport of magma from the upper mantle to the individual volcanoes. We leverage advances in earthquake monitoring with deep learning algorithms to image the structures underlying a major mantle earthquake swarm of nearly 200,000 events that rapidly accelerated following the 2018 Kīlauea caldera collapse. At depths of 36-43 km, we resolve a 15 km long collection of near-horizontal sheeted structures that we identify as a sill complex. These sills connect to the lower depths of Kīlauea’s plumbing by a 25 km-long belt of seismicity. Additionally, a column of seismicity links the sill complex to a shallow decollement near Mauna Loa. These findings implicate the mantle sill complex as a nexus for magma transport beneath Hawai‘i and furthermore indicate widespread magmatic connectivity in the volcanic system.
DOI: ade5755
Source: https://www.science.org/doi/10.1126/science.ade5755