Magmatic connectivity among six Galápagos volcanoes revealed by satellite geodesy.
Magmatic connectivity among six Galápagos volcanoes revealed by satellite geodesy.
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卫星大地卫星揭示的六座加拉帕戈斯火山之间的岩浆连通性。
DOI：
10.1038/s41467-023-42157-x
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发表时间：
2023-10-19
影响因子：
16.6
通讯作者：
Aguaiza, Santiago
中科院分区：
文献类型：
--
作者：
Reddin, Eoin;Ebmeier, Susanna K.;Rivalta, Eleonora;Bagnardi, Marco;Baker, Scott;Bell, Andrew F.;Mothes, Patricia;Aguaiza, Santiago
产生可测量的火山表面变形的浅层岩浆储集层通常被视为离散的独立系统。然而，对喷发产物的岩石学分析表明，这些可能是我们所显示的可能相互关联的广泛、非均质岩浆系统的最浅表达。我们分析了从2017年到2022年西加拉帕戈斯火山卫星雷达测量的位移时间序列，并回顾了历史位移。我们证明，这些火山在向浅层地壳供应岩浆的高峰期持续经历相关的位移。我们排除了静态应力、浅层液压连接以及数据处理和分析人工制品的变化。我们认为，间歇性的岩浆涌入相互关联的岩浆系统影响到邻近的火山，同时导致火山隆升和下沉的相关性。虽然这种过程预计将在全球范围内发生，但由于地表移位率高和丰富的大地测量数据，在加拉帕戈斯西部密集的火山群中可以独特地观察到这种过程。雷丁等人。使用卫星雷达测量加拉帕戈斯六座火山的变形。他们观测到多座火山之间的相关形变信号，并将其归因于相互关联的岩浆系统在时间上变化的羽流供应。
Shallow magmatic reservoirs that produce measurable volcanic surface deformation are often considered as discrete independent systems. However, petrological analyses of erupted products suggest that these may be the shallowest expression of extensive, heterogeneous magmatic systems that we show may be interconnected. We analyse time series of satellite-radar-measured displacements at Western Galápagos volcanoes from 2017 to 2022 and revisit historical displacements. We demonstrate that these volcanoes consistently experience correlated displacements during periods of heightened magma supply to the shallow crust. We rule out changes in static stress, shallow hydraulic connections, and data processing and analysis artefacts. We propose that episodic surges of magma into interconnected magmatic systems affect neighbouring volcanoes, simultaneously causing correlations in volcanic uplift and subsidence. While expected to occur globally, such processes are uniquely observable at the dense cluster of Western Galápagos volcanoes, thanks to the high rate of surface displacements and the wealth of geodetic measurements. Reddin et al. use satellite radar to measure deformation at six Galápagos volcanoes. They observe correlated deformation signals between multiple volcanoes and attribute them to temporally varying plume supply into interconnected magmatic systems.
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