Rock‐Matrix Porosity and Permeability of the Hydrothermally Altered, Upper Oceanic Crust, Oman Ophiolite

Brett‐Adams, Alannah C.; Diamond, Larryn W.; Weber, Samuel; Gilgen, Samuel A.

doi:10.1029/2022jb024948

Cited by 1 publication

(1 citation statement)

References 67 publications

(209 reference statements)

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“…S13). This estimation is consistent with the measured porosity of Oman Ophiolite pillow basalt (4-12%) 42 , but it is less than that of the uppermost oceanic crust at 100-200 m depth estimated from gravity surveys (for instance, 10-23% on the Endeavour segment 43 , 15-33% for Axial Seamount 44 ). This may be caused by the averaging effect of FWI along wave paths over near-seafloor sediments and deeper parts of layer 2A (~287-925 m).…”

Section: P-wave Velocity and Attenuation Models Across Axial Seamountsupporting

confidence: 88%

Asymmetric magma plumbing system beneath Axial Seamount based on full waveform inversion of seismic data

Yang,

Zhu,

Zhao

et al. 2024

Nat Commun

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The architecture of magma plumbing systems plays a fundamental role in volcano eruption and evolution. However, the precise configuration of crustal magma reservoirs and conduits responsible for supplying eruptions are difficult to explore across most active volcanic systems. Consequently, our understanding of their correlation with eruption dynamics is limited. Axial Seamount is an active submarine volcano located along the Juan de Fuca Ridge, with known eruptions in 1998, 2011, and 2015. Here we present high-resolution images of P-wave velocity, attenuation, and estimates of temperature and partial melt beneath the summit of Axial Seamount, derived from multi-parameter full waveform inversion of a 2D multi-channel seismic line. Multiple magma reservoirs, including a newly discovered western magma reservoir, are identified in the upper crust, with the maximum melt fraction of ~15–32% in the upper main magma reservoir (MMR) and lower fractions of 10% to 26% in other satellite reservoirs. In addition, a feeding conduit below the MMR with a melt fraction of ~4–11% and a low-velocity throat beneath the eastern caldera wall connecting the MMR roof with eruptive fissures are imaged. These findings delineate an asymmetric shallow plumbing system beneath Axial Seamount, providing insights into the magma pathways that fed recent eruptions.

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Section: P-wave Velocity and Attenuation Models Across Axial Seamountsupporting

confidence: 88%

Asymmetric magma plumbing system beneath Axial Seamount based on full waveform inversion of seismic data

Yang,

Zhu,

Zhao

et al. 2024

Nat Commun

View full text Add to dashboard Cite

show abstract

Rock‐Matrix Porosity and Permeability of the Hydrothermally Altered, Upper Oceanic Crust, Oman Ophiolite

Cited by 1 publication

References 67 publications

Asymmetric magma plumbing system beneath Axial Seamount based on full waveform inversion of seismic data

Asymmetric magma plumbing system beneath Axial Seamount based on full waveform inversion of seismic data

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