NSFGEO-NERC: Investigating pre-, co-, and post-eruption processes at Sierra Negra volcano, Galapagos using geodetic and seismic data

NSFGEO-NERC：利用大地测量和地震数据研究加拉帕戈斯群岛内格拉火山的喷发前、同时和喷发后过程

• 批准号: NE/W007274/1
• 负责人: Andrew Bell
• 金额: $ 30.61万
• 依托单位: University of Edinburgh
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FW007274%2F1
• 关键词: NSFGEO; NERC; Investigating; pre; co

Sierra Negra volcano, in the Galápagos Islands of Ecuador, is one of the largest basaltic calderas on Earth, measuring 9 km by 7 km. Through investments from the NSF RAPID and NERC Urgency programs, the June 26-August 30, 2018 eruption of Sierra Negra was the first eruption at a Galápagos Islands volcano to be recorded by a local geophysical monitoring network. The resulting data are spectacular. The eruption involved >6.5 m of pre-eruptive inflation, formation of a ~12 km long fissure system on the north flank, ~8.5 m of co-eruptive deflation (one of the largest co-eruptive displacements ever observed without collapse on caldera-bounding ring faults), and ~1.5 m of net uplift (resurgence) on the intra-caldera trapdoor fault system. Hundreds of thousands of earthquakes accompanied the pre- and co-eruptive phases, including inflationary and deflationary intra-caldera 'trapdoor' faulting events up to Mw5.4. The NSFGEO-NERC collaborative scheme is ideally suited to bring together unique, complementary geodetic and seismic observations and modeling to address specific questions relating to the behavior of Sierra Negra, the nature of Galápagos volcanism, and important outstanding questions about fundamental volcano deformation and interaction between a volcanic edifice and magma plumbing system.

厄瓜多尔加拉帕戈斯群岛的内格拉火山 (Sierra Negra) 是地球上最大的玄武岩破火山口之一，长 9 公里，宽 7 公里，在 NSF RAPID 和 NERC 紧急计划的投资下，内格拉火山于 2018 年 6 月 26 日至 8 月 30 日喷发。内格拉是当地地球物理监测网络记录的加拉帕戈斯群岛火山的首次喷发，由此产生的数据非常惊人。喷发涉及 >6.5 m 的喷发前膨胀，在北侧形成约 12 km 长的裂缝系统，约 8.5 m 的同喷收缩（有史以来观察到的最大同喷位移之一，但火山口边界没有塌陷）环断层），火山口内活板门断层系统上约 1.5 m 的净隆起（复苏）伴随着前和前的数十万次地震。 NSFGEO-NERC 合作计划非常适合将独特的、互补的大地测量和地震观测和建模结合起来，以解决与相关的具体问题。内格拉山脉的行为、加拉帕戈斯火山活动的性质，以及有关基本火山变形和火山建筑物与岩浆管道系统之间相互作用的重要悬而未决的问题。

项目成果

Magmatic connectivity among six Galápagos volcanoes revealed by satellite geodesy.

卫星大地测量揭示了加拉帕戈斯六座火山之间的岩浆连通性。

• DOI: http://dx.10.1038/s41467-023-42157-x
• 发表时间: 2023
• 期刊: Nature communications
• 影响因子: 16.6
• 作者: Reddin E