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Enigmatic Harmonic Tremor in the Samail Ophiolite, Oman: Evidence for Subsurface Gas Flow
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DOI：10.1029/2025JB033691.png)
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Abstract
En 中文
Harmonic tremors are a unique class of seismic signals often attributed to subsurface fluid flow, but can also be generated by anthropogenic processes. We present observations of a tremor with a harmonic interval of similar to 12.75 Hz up to the 15th mode at similar to 191 Hz during a seismic-borehole-acoustic experiment at the Oman Drilling Project Multi-Borehole Observatory, located on an ultramafic terrain of the Samail Ophiolite with minimal human activities. The tremor persisted for the entire 9-month observation interval, with mode frequencies varying by similar to 0.1% diurnally and by similar to 1% overall. We find that the tremor characteristics are inconsistent with signals from documented anthropogenic sources and that sustained gas flow through a fluid-filled, subsurface fracture is the most plausible source mechanism. Our results have potentially important implications for free gas processes during low-temperature serpentinization and motivate further research to investigate the seismic signals generated in these environments.
Keywords:
harmonic tremor
serpentinization
subsurface fluid flow
ophiolite
geological hydrogen
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4.1
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182
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0
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