Results 91 to 100 of about 138 (115)

Effect of a Wrist Harmonic Liquid Tremor Absorber‐Damping on the Upper Extremity Essential Tremor

Movement Disorders
AbstractBackgroundEssential tremor (ET) is a common type of tremor. Previous research has shown that wearable orthoses and biomechanical loading methods can suppress tremors.ObjectiveThis study aims to investigate the effect of a harmonic liquid dampener on upper extremity ET.MethodsThe study involved 9 women and 5 men from a neurology outpatient ...
, Furkan Dogan
exaly   +3 more sources

Strongly gliding harmonic tremor during the 2009 eruption of Redoubt Volcano

Journal of Volcanology and Geothermal Research, 2013
Abstract During the 2009 eruption of Redoubt Volcano, Alaska, gliding harmonic tremor occurred prominently before six nearly consecutive explosions during the second half of the eruptive sequence.
Joan Gomberg, John Vidale, Stephanie Prejean   +2 more
exaly   +2 more sources

A Seismic Model for the Source of Long-Period Events and Harmonic Tremor

IAVCEI Proceedings in Volcanology, 1992
The sharply peaked spectra of long-period events and harmonic tremor can be explained by the resonance of a three-dimensional, fluid-driven crack induced by a pressure transient applied over a small area ΔS of the crack wall. The crack resonance is sustained by a very slow dispersive wave called the crack wave, the phase velocity of which decreases ...
Bernard Chouet
exaly   +2 more sources

Frictional-faulting model for harmonic tremor before Redoubt Volcano eruptions

Nature Geoscience, 2013
Volcanic tremor can be caused by small earthquakes occurring within the volcano. Mechanical modelling of volcanic tremor generated at Redoubt Volcano, Alaska, suggests that high-frequency tremor is the result of stick–slip motion in faults within the volcano conduit.
Stephanie Prejean, Eric Dunham, Alicia Hotovec-Ellis   +2 more
exaly   +2 more sources

Volcanic harmonic tremor location

Journal of Volcanology and Geothermal Research, 2023
Lenin Ávila-Barrientos
exaly   +2 more sources

Infrasonic harmonic tremor and degassing bursts from Halema'uma'u Crater, Kilauea Volcano, Hawaii

Journal of Geophysical Research, 2010
The formation, evolution, collapse, and subsequent resurrection of a vent within Halema'uma'u Crater, Kilauea Volcano, produced energetic and varied degassing signals recorded by a nearby infrasound array between 2008 and early 2009. After 25 years of quiescence, a vent‐clearing explosive burst on 19 March 2008 produced a clear, complex acoustic signal.
Bernard Chouet, David Fee, Milton Garces   +2 more
exaly   +2 more sources

Saturated and subcooled hydrothermal boiling in groundwater flow channels as a source of harmonic tremor

Journal of Geophysical Research, 1988
The potential of hydrothermal boiling in groundwater flow channels for generating harmonic tremor (a relatively monochromatic ground vibration associated with volcanic activity) is examined. We use simple “organ pipe” theory of normal‐mode fluid vibration and fundamental energy considerations to develop a first‐order analytical model of a hydrothermal ...
exaly   +2 more sources

Are harmonic tremors self-excited thermoacoustic oscillations?

Earth and Planetary Science Letters, 2005
Abstract The thermoacoustic instability is proposed as a possible cause of volcanic harmonic tremors. Properties of this instability are discussed in relationship to conditions in active volcanoes, and directions of possible future research are outlined.
F BUSSE, P MONKEWITZ, M HELLWEG
openaire   +1 more source

Volcanic harmonic tremors during a non-eruptive event, Torfajokull volcano, Iceland [PDF]

, 2022
<p>Harmonic tremor, ground vibrations captured by seismometers oscillating in different frequencies, has been widely identified as a result of distinct physical processes. In volcanic areas, the physical processes to explain the gliding spectral lines are usually identified preceding/accompanying eruptions.
Joana Martins, Elmer Ruigrok, Andrew Hooper   +2 more
openaire   +2 more sources

Eigen oscillation of a fluid sphere and source mechanism of harmonic volcanic tremor

Journal of Volcanology and Geothermal Research, 1995
Abstract The eigen oscillation of a fluid sphere embedded in an infinite elastic medium is analyzed to understand the source mechanism of volcanic tremor that vibrates nearly monotonically and attenuates slowly. The dimensionless eigen frequencies of the sinusoidal oscillation are calculated in a complex form with the attenuation factor in its ...
Eisuke Fujita, Yoshiaki Ida, Jun Oikawa
openaire   +1 more source