tremor

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tremor

a minor earthquake

Tremor

 

an involuntary trembling of the entire body or parts of it. Tremors are characteristically rhythmic and stereotypic; usually they have a narrow range, most often affecting the fingers, eyelids, tongue, lower jaw, and head. In healthy subjects, tremors may be caused by muscular strain, emotional excitement, or exposure to cold. Pathological tremors may be symptoms of chronic alcoholism, thyrotoxicosis, neurotic states, acute infections, and such diseases as parkinsonism. The symptom is treated by treating the primary disease.

Eye tremor is an involuntary rapid movement of the eyeball in relation to the optic axis; its frequency is from 20 to 150 Hz, and its amplitude, from 5 to 15 seconds of arc. Visual perception itself depends to a significant degree on eye tremor, which produces constant changes in the illuminance of certain photoreceptors—that is, the photoreceptors located at the variously illuminated points of the retinal periphery. An image whose projection on the retina remains completely stable for more than a few seconds ceases to be perceived by the visual centers of the brain.

tremor

[′trem·ər]
(geophysics)
A minor earthquake. Also known as earthquake tremor; earth tremor.
(medicine)
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
References in periodicals archive ?
According to the Civil Engineering Department of UCD, the country's existing building codes don't cover the possibility of earth tremors.
EARTH tremors that shook Blackpool were almost certainly caused by a company drilling for gas, experts said yesterday.
The earth tremors were felt in Andizhan and Fergana regions as 5 scores, in Namangan region - 4 scores, in Tashkent city - 5 scores.
These damaging processes might be due to weather, aging of materials, earth tremors and a lack of maintenance.
Campaigners fear that earth tremors could occur anywhere and bring catastrophe to sites where waste was buried.
Freak waves at sea - unlike tidal waves which hit coastlines after earth tremors - are caused when one wave sucks from others around it, becoming a towering monster.
He forecast the tunnel will reach a depth of 21/2 miles below the sea, and would need special construction techniques to cope with minor earth tremors around the Mid-Atlantic Ridge.
There are also environmental concerns over contamination of groundwater as well as possible earth tremors, such as the ones that occurred near Blackpool and prompted a temporary ban by the same UK government that is now so gung-ho about the matter.
Residents of the territorial center felt earth tremors of 3-4 points.
But Energy Secretary Ed Davey said yesterday that fracking could resume with new controls in a bid to prevent earth tremors.
I fear this poisonous waste will not respect geographical or political boundaries when the 'safe' environment proves not to be so, given the tendency for earth tremors and shocks on this north west fault line.