Results 101 to 110 of about 138 (115)

Observations of high-frequency harmonic tremor in Fogo, Cape Verde Islands

Journal of Volcanology and Geothermal Research, 2006
Abstract We report observations of high-frequency (HF) volcanic tremor, with spectral peaks in the band 5–20 Hz, recorded in Fogo Island, Cape Verde archipelago. Several occurrences are characterized by regularly spaced spectral peaks, but the fundamental frequency is missing.
Sandra I.N. Heleno, Bruno V.E. Faria, Zuleyka Bandomo, João F.B.D. Fonseca   +3 more
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An experimental investigation of seismic and acoustic harmonic tremor gliding and implication for churn-like flow

2022
<p>The gradual shift over time of the spectral lines of harmonic seismic and/or acoustic tremor, that is commonly known as spectral gliding, has been largely observed at different volcanoes. Despite the clear advantage of the experimental approach in providing direct observation of degassing processes and of the related elastic radiation,
Laura Spina, Andrea Cannata, Daniele Morgavi, Eugenio Privitera, Diego Perugini   +4 more
openaire   +1 more source

Enigmatic Harmonic Tremor in the Samail Ophiolite, Oman: Evidence for Subsurface Gas Flow

Journal of Geophysical Research: Solid Earth
Abstract 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 ∼12.75 Hz up to the 15th mode at ∼191 Hz during a seismic‐borehole‐acoustic experiment at the Oman Drilling ...
Tianze Liu, Chao Liang, John M. Aiken, Wenbo Wu, Robert Sohn   +4 more
openaire   +1 more source

Resonance of a fluid‐driven crack: Radiation properties and implications for the source of long‐period events and harmonic tremor

Journal of Geophysical Research: Solid Earth, 1988
A dynamic source model is presented, in which a three‐dimensional crack containing a viscous compressible fluid is excited into resonance by an impulsive pressure transient applied over a small area ΔS of the crack surface. The crack excitation depends critically on two dimensionless parameters called the crack stiffness, C = (b/μ)(L/d), and viscous ...
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Harmonics in frequency spectra: a contribution to differential diagnosis of tremor

Aktuelle Neurologie, 2007
G Ellrichmann, J Jamrozy, A Hoffmann, PH Kraus   +3 more
openaire   +1 more source

Enigmatic Harmonic Tremors at the Oman Drilling Project Multi-Borehole Observatory: Cultural Noise or Subsurface Fluids?

Harmonic tremors are elusive seismic signals whose origins are often debated because they can be generated by both natural and anthropogenic processes. Harmonic tremors attributed to natural origins are often observed in systems hosting active subsurface fluid flow.
Tianze Liu, Chao Liang, John M Aiken, Wenbo Wu, Robert Sohn   +4 more
openaire   +1 more source

Analytical and experimental studies on particle damper used for tremor suppression

JVC/Journal of Vibration and Control, 2021
Zheng Lu, Zheng Lu, Zhikuang Huang
exaly  

Harmonic Tremor

2012
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Harmonic Tremor

2013
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harmonic micro-tremor

2014
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