Methane Plume Emissions Associated With Puget Sound Faults in the Cascadia Forearc

Johnson, H. Paul; Merle, Susan G.; Bjorklund, Tor A.; Hautala, Susan L.; Baumberger, Tamara; Walker, Sharon L.; Liu, Junzhe; Ward, Nicholas D.; Wang, Chenyu

doi:10.1029/2021gc010211

Title: Methane Plume Emissions Associated With Puget Sound Faults in the Cascadia Forearc

Journal Article · 28 December 2021 · Geochemistry, Geophysics, Geosystems

DOI: https://doi.org/10.1029/2021gc010211 · OSTI ID:1847558

^[1];

^[2]; Bjorklund, Tor A. ^[1];

^[1];

^[2];

^[3]; Liu, Junzhe ^[1];

^[4]; Wang, Chenyu ^[1]

Univ. of Washington, Seattle, WA (United States)
Oregon State Univ., Newport, OR (United States). Cooperative Inst. for Marine Resources Studies, NOAA PMEL Earth Ocean Interactions Program
NOAA/Pacific Marine Environmental Lab Seattle WA USA
Univ. of Washington, Seattle, WA (United States); Pacific Northwest National Lab. (PNNL), Sequim, WA (United States)

Methane gas plumes have been discovered to issue from the seafloor in the Puget Sound estuary. These gas emission sites are co-located over traces of three major fault zones that fracture the entire forearc crust of the Cascadia Subduction Zone. Multibeam and single-beam sonar data from cruises conducted in 2011, 2018, 2019, 2020 and 2021 identified the acoustic signature of over 330 bubble plumes. Dissolved gas from the plumes combines to elevate seawater methane concentrations of the entire Puget Sound estuary. Fluid samples from adjacent terrestrial hot springs and deep-water wells surrounding the estuary contain a helium-3 isotope signature, indicating a deep fluid source located near the underlying Cascadia Subduction Zone. However, Puget Sound seawater emission sites lack chemical isotope signatures and elevated thermal anomalies expected from association with a deep plate-interface reservoir. The existence of vigorous marine methane plumes located in areas of thin sediment cover and above the traces of deeply-penetrating forearc fault zones – but still presenting no thermal or chemical anomalies that are found in many other similar forearc environments and remain an unresolved paradox.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; National Science Foundation (NSF)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1847558

Report Number(s):: PNNL-SA-166987

Journal Information:: Geochemistry, Geophysics, Geosystems, Journal Name: Geochemistry, Geophysics, Geosystems Journal Issue: 1 Vol. 23; ISSN 1525-2027

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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