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Class I neurons can generate action potentials with arbitrarily low frequency depending on the ... i.e. a high- and low-amplitude ... A tremor is an involuntary ...
Research on the origin of seismic noise [1] indicates that the low frequency part of the spectrum (below 1 Hz) is principally due to natural causes, chiefly ocean waves.In particular the globally observed peak between 0.1 and 0.3 Hz is clearly associated with the interaction of water waves of nearly equal frequencies but probating in opposing directions.
Amplitude: A fine tremor is very small or barely noticeable movement; a coarse tremor is a large movement. Tremors in between these two may be described as medium amplitude. Frequency: A slow tremor makes a motion at a few times per second. A rapid or fast tremor is around 12 Hz or faster.
A diagnosis of solely intention tremor can only be made if the tremor is of low frequency (below 5 Hz) and without the presence of any resting tremors. [1] Electrophysiological studies can be useful in determining frequency of the tremor, and accelerometric studies quantify tremor amplitude.
Episodic tremor and slip (ETS) is a seismological phenomenon observed in some subduction zones that is characterized by non-earthquake seismic rumbling, or tremor, and slow slip along the plate interface. Slow slip events are distinguished from earthquakes by their propagation speed and focus. In slow slip events, there is an apparent reversal ...
The low-frequency continuous tremor researchers observed was initially interpreted to be a result of dehydration reactions in the subducting plate. [21] The source of these tremors occurred at an average depth of around 30 kilometers, and they were distributed along the strike of the subduction interface over a length of 600 kilometers. [ 20 ]
Seismograph recording of harmonic tremor Four major types of seismograms, or seismic signatures. A harmonic tremor is a sustained release of seismic and infrasonic energy typically associated with the underground movement of magma, the venting of volcanic gases from magma, or both in volcanoes, and with repetitive stick-slip or other impulsive activity in non-volcanic systems.
The high and low bounds are representative noise limits for seismographs deployed worldwide. The solid and dashed lines indicate the median and mode of the probability density function, respectively. Dominant microseism signals from the oceans are linked to characteristic ocean swell periods, and thus occur between approximately 4 to 30 seconds ...