intrusion

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intrusion

1. Geology
a. the movement of magma from within the earth's crust into spaces in the overlying strata to form igneous rock
b. any igneous rock formed in this way
2. Property law an unlawful entry onto land by a stranger after determination of a particular estate of freehold and before the remainderman or reversioner has made entry
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 It might be outdated or ideologically biased.

Intrusion

 

a geological term used in two senses:

(1) The process of magma injection into the body of rock that forms the earth’s crust. The solidification of such injected magma leads to the formation of intrusive rock.

(2) An intrusion is a geological body composed of igneous rock and formed in the process of injection and solidification of mag-matic melt in the earth’s crust (intrusion, intrusive body, plutonic intrusion). In relation to the structure of the country rock, intrusions are classified as concordant and discordant. The first group includes sills, laccoliths, and lopoliths, and the second group includes batholiths, stocks, and dikes. Intrusions are classified according to the depths at which the magmatic intrusion occurred as deep-seated intrusions (abyssal) and shallow-depth intrusions (hypabyssal). In this context the conditions of cooling of the magma and its effect on surrounding rock differ sharply. At shallow depths the cooling is rapid and fine crystalline or porphyritic rock is formed, and contact metamorphosis affects a small area of the country rock. At great depths medium-grain and large-grain rock and major changes in the surrounding rock are characteristic.

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

intrusion

[in′trü·zhən]
(geology)
The process of emplacement of magma in preexisting rock. Also known as injection; invasion; irruption.
A large-scale sedimentary injection. Also known as sedimentary intrusion.
Any rock mass formed by an intrusive process.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

intrusion

Unauthorized access to a computer system or network. See intruder and IDS.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
confirmed Monday giving the order for the Department of Foreign Affairs to lodge a diplomatic protest over the intrusion of Chinese warships in the West Philippine Sea.
The cluster Gaussian classifier utilizes the information of known normal and intrusion data to find the extract boundary of normal and known intrusions.
In this study, we investigate whether and under what conditions quartz precipitation affects permeability near shallow intrusions. We present numerical models simulating quartz precipitation and silica dissolution during fluid convection around transiently cooling intrusions and notably do not consider the effect of significant fluid expulsion from hydrous magmas [32].
Because satellites can image only the ocean's surface, scientists in 2006 couldn't tell what subsurface processes might be causing the warm-water intrusions, or how deep the warmer temperatures extended.
The collaboration between AQAST, NASA's AJAX team, EPA, NOAA, and air quality managers in Wyoming, Colorado, and other states has been valuable in identifying, predicting, and conducting retrospective analysis of stratospheric intrusions. Furthermore, AQAST scientists have worked with the EPA SI Working Group to develop user-friendly tools that could reduce the burden on the Wyoming DEQ and other air quality managers whose states experience stratospheric intrusions.
Questionnaire of Unpleasant Intrusive Thoughts (QUIT) is a self-report questionnaire, based on the Revised Obsessional Intrusions Inventory (ROII; Purdon & Clark, 1993), to assess the frequency of mental intrusions and their associated discomfort.
An intrusion detection system is used to enhance the security of networks by inspecting all inbound and outbound network activities and by classifying suspicious patterns as possible intrusions [2].
The proposed approach makes use of a novel randomized data partitioned learning method (RDPLM) and analyzes packet header rather than packet payload to identify intrusion. Authors developed a novel feature selection technique to create a subset of features which will be helpful for correct detection of intrusions.
The modelling for mantle source suggests that these intrusions are the result of partial melting of 1-5% of a deep, enriched, and predominantly of a depth greater than90 km, and may be pooled a lithospheric depths of-30 km.
The principal objective of our proposed (C-NIDS) is to design and integrate a Network Intrusion Detection System (NIDS) that can detect network intrusions in Cloud environment, while reducing false alarm rate with affordable computational and communication cost.
If the misuse rules are not well constructed, then the intrusion detection system cannot effectively detect intrusions.