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a minor earthquake
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


A minor earthquake. Also known as earthquake tremor; earth tremor.
Involuntary, rhythmic trembling of voluntary muscles resulting from alternate contraction and relaxation of opposing muscle groups.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The tremor comes only two days after a 2.1 scale "micro-seismic event" was detected at the Cuadrilla energy site late on Saturday evening, previously the largest tremor ever recorded at the site.
'I thought it would be a pity if expensive equipment kept us from continuing our research to find treatments for tremor. That's why I set out to find an affordable and valid way to measure it, and I came up with the idea of ??using a smartphone as a measuring device', explains Eva Maria Meier Carlsen, who is a postdoc at the Department of Neuroscience.
'We are continuing to monitor the earth tremors and we are on the fourth week now,' he said.
When to see your GP See your GP if the tremor is getting worse over time or it's affecting your daily activities.
A magnitude 4.4 tremor struck some seven kilometers southwest of San Nicolas, Ilocos Norte at 3 a.
An earthquake in April 2018 was the first tremor to strike Surrey in the 268 years since British Geological Survey (BGS) records began.
Though the tremors were mostly felt in the northern parts of the country, residents in Sharjah and Dubai also reported the same to Khaleej Times.
On December 14, earthquake tremors were reported in Peshawar, Lower Dir, Buner and surrounding districts of Khyber Pakhtunkhwa (KP) province.
A woman, age 77, consulted regarding several problems including previously diagnosed essential tremor. She had pronounced shaking of the head and impaired handwriting from tremor of the hands.
The Meteorological Department has denied that tremors which occurred at several areas in the vicinity of Sri Aman, about 200km from here this afternoon were caused by an earthquake.
ISLAMABAD -- Earthquake tremors were felt in Islamabad along with Peshawar, Nowshera, and Kohat on Wednesday morning (today).
Tremors were felt across the country's northern regions, including the federal capital, Abbottabad, Bajaur Agency, Manshera, Dera Ismail Khan, Jhang, Chitral, Peshawar, Lahore, Faisalabad, Chiniot, Azad Jammu and Kashmir Swat, Nowshera, Mianwali, Kotli, DG Khan, Okara, Kasur.