chatter marks - определение. Что такое chatter marks
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Что (кто) такое chatter marks - определение

WEDGE-SHAPED MARKINGS IN BEDROCK LEFT BY THE PASSAGE OF GLACIERS
Chatter Mark; Chatter marks; Crescentic gouge; Chatter-mark; Chattermark

Chatter mark         
·add. ·- A short crack on a rock surface planed smooth by a glacier.
II. Chatter mark ·add. ·- One of the fine undulations or ripples which are formed on the surface of work by a cutting tool which chatters.
Chatter mark         
A chatter mark is one or, more commonly, a series of wedge shaped marks left by chipping of a bedrock surface by rock fragments carried in the base of a glacier (glacial plucking). Marks tend to be crescent-shaped and oriented at right angles to the direction of ice movement.
Chatter (signals intelligence)         
VOLUME OF COMMUNICATION TO OR FROM SUSPECTED TERRORISTS OR SPIES
Chatter (al qaeda); Chatter (Al Qaeda); Terrorist chatter; Chatter (intelligence); Chatter (surveillance); Chatter (terrorist)
Chatter is a signals intelligence term, referring to the volume (quantity) of intercepted communications. Intelligence officials, not having better metrics, monitor the volume of communication, to or from suspected parties such as terrorists or spies, to determine whether there is cause for alarm.

Википедия

Chatter mark

In glacial geology, a chatter mark is one (or, more commonly, a series) of wedge-shaped marks left by chipping of a bedrock surface by rock fragments carried in the base of a glacier (glacial plucking). Marks tend to be crescent-shaped and oriented at right angles to the direction of ice movement.

There are three different types of chatter marks. The crescentic gouge is an upstream concave that is made by the removal of a piece of rock. The crescentic fracture which is a downstream concave that is also made by the removal of rock. The lunate fracture is also a downstream concave made without the removal of rock.