Capturing Mayotte's deep magmatic plumbing system and its spatiotemporal evolution with volcano-tectonic seismicity

IF 2.5 Q2 Earth and Planetary Sciences
Aude Lavayssière, Lise Retailleau
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引用次数: 0

Abstract

Since 2018 an unexpected number of earthquakes have been occurring offshore Mayotte, in the Mozambique Channel. They are linked to the eruption of the Fani Maoré submarine volcano. Using a recently-developed comprehensive automatic catalog, we explore two years of volcano-tectonic (VT) seismicity between March 2019 and March 2021 and analyse in detail the active structures of the magmatic plumbing system using ~33,000 events. The VT earthquakes highlight three magma storage zones and two aseismic conduits that had never been observed before. The temporal evolution of the seismicity reveals a probable regime change in March 2020. While before, the plumbing system reacted to the drainage of magma from a deep reservoir and to the migration of magma towards the seafloor, it is now responding to new migrations of fluids and to the redistribution of the stress-load across the system's pre-existing faults. This analysis is key to better understand long-term volcanism worldwide.
火山-构造地震活动性下马约特深部岩浆管道系统及其时空演化
自2018年以来,莫桑比克海峡的马约特岛近海发生了意想不到的地震。它们与Fani maor海底火山的喷发有关。使用最近开发的综合自动目录,我们探索了2019年3月至2021年3月之间两年的火山构造(VT)地震活动,并使用约33,000个事件详细分析了岩浆管道系统的活动结构。VT地震突出了三个岩浆储存带和两个以前从未观测到的地震管道。地震活动的时间演变揭示了2020年3月可能发生的政权变化。以前,管道系统对岩浆从深层储层流出和岩浆向海底迁移做出反应,而现在,它对新的流体迁移和系统原有断层上应力负荷的重新分配做出反应。这一分析是更好地了解全球长期火山活动的关键。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Volcanica
Volcanica Earth and Planetary Sciences-Geology
CiteScore
4.40
自引率
0.00%
发文量
21
审稿时长
21 weeks
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