The magmatic web beneath Hawai'i

• 成果类型: Article
• 署名作者: Wilding, John D.; Zhu, Weiqiang; Ross, Zachary E.; Jackson, Jennifer M.
• 署名单位: California Institute of Technology
• 刊物名称: SCIENCE
• ISSN/ISSBN: 0036-11722
• DOI: 10.1126/science.ade5755
• 发表日期: 2023-02-03
• 页码: 462-+
• 关键词: long-period earthquakes; kilauea-volcano; mauna-loa; upper-mantle; deep; transport; intrusions; relocation; events; GROWTH

摘要

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 after the 2018 Kilauea caldera collapse. At depths of 36 to 43 kilometers, we resolve a 15-kilometers-long collection of near-horizontal sheeted structures that we identify as a sill complex. These sills connect to the lower depths of Kilauea's plumbing by a 25-kilometers-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.