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MICROSEISMIC [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2017-01-30

English

Subject field(s)
  • Scientific Instruments
DEF

A sensor that generates an electric signal that varies with the pressure applied to the piezoelectric material it contains, i.e. polarized ceramic, and that therefore allows the detection of objects, the measurement of physical quantities or the reproduction of phenomena.

CONT

Eight piezo-ceramic sensors record the microseismic events, which are then located to within an accuracy of 2 mm.

Key term(s)
  • piezoceramic sensor

French

Domaine(s)
  • Instruments scientifiques
DEF

Capteur qui génère un signal électrique variant en fonction de la pression exercée sur le matériau piézoélectrique qu'il contient, en l'occurrence de la céramique polarisée, et qui permet ainsi la détection d'objets, la mesure de grandeurs physiques ou la reproduction de phénomènes.

CONT

Par ailleurs, un capteur piézo-céramique enregistrant les vibrations crâniennes permet de distinguer les cris de l'animal en expérience de ceux des autres animaux du groupe, en comparant les signaux provenant du microphone ambiant et ceux du capteur crânien de vibrations [...]

Key term(s)
  • capteur piézocéramique

Spanish

Save record 1

Record 2 2012-04-02

English

Subject field(s)
  • Geophysics
  • Vulcanology and Seismology
  • Surveillance, Detection and Reconnaissance (Military)
CONT

The resolution of seismic signals with intermediate frequencies... is hindered by the presence in this range of a natural form of seismic background noise. The noise derives from a nearly continuous succession of small ground movements that are referred to as microseisms. Some microseismic noise is of local origin, related to such effects as vehicular traffic, rainfall, wind action on trees, etc. However, an important source is the action of storm waves at sea, which is detectable on seismic records far inland.

French

Domaine(s)
  • Géophysique
  • Volcanologie et sismologie
  • Surveillance, détection et reconnaissance (Militaire)
CONT

De nombreuses études permettent [...] d'attribuer le bruit microsismique à l'action des vagues océaniques sur les côtes (ressac) et à la pression des vagues stationnaires de l'océan (clapotis). Ce bruit, qui semble être plus élevé dans le Pacifique que dans l'Atlantique ou l'Arctique, est vraisemblement engendré par des effets météorologiques ou océaniques très éloignés [...]

Spanish

Save record 2

Record 3 2012-01-04

English

Subject field(s)
  • Vulcanology and Seismology
  • Geophysics
DEF

An instrument for recording microseismic activity.

French

Domaine(s)
  • Volcanologie et sismologie
  • Géophysique
DEF

Séismographe très sensible aux vibrations de courte période (quelques secondes), employé pour l'enregistrement des microséismes.

Spanish

Save record 3

Record 4 2006-05-23

English

Subject field(s)
  • Vulcanology and Seismology
  • Mining Engineering
DEF

... a proven technology for acquiring empirical data on the dimensions of created fracture systems.

CONT

The production of hydrocarbon reservoirs, the exploitation of hydrothermal fields and mining activity in general are associated with microseismicity. Changes of the local stress fields and pore pressure can initiate sudden movements along existing faults or can generate new fractures which in turn result in the emission of seismic energy. Monitoring and analyses of microseismic events have the potential to delineate the internal structure of the subsurface, to obtain information on the present stress conditions and to image dynamic processes like subsidence and fluid flow.

French

Domaine(s)
  • Volcanologie et sismologie
  • Génie minier

Spanish

Save record 4

Record 5 2000-05-25

English

Subject field(s)
  • Vulcanology and Seismology
  • Surveillance, Detection and Reconnaissance (Military)
DEF

A network of seismographs arranged in a special pattern and connected to a central computer so as to enable the signal from earthquake and explosion ground motion to be processed and enhanced with respect to the noise of microseismic ground motion.

French

Domaine(s)
  • Volcanologie et sismologie
  • Surveillance, détection et reconnaissance (Militaire)
OBS

Posés à la surface du sol d'une station sismographique (Fascicule no 2, NY, 1990).

OBS

Reproduit du lexique «Disarmament and Peace Keeping/Désarmement et Maintien de la Paix» avec l'autorisation de l'Office des Nations Unies à Genève.

Key term(s)
  • nappe de séismographes
  • ensemble séismologique
  • ensemble de séismographes

Spanish

Save record 5

Record 6 1986-10-06

English

Subject field(s)
  • Mining Dangers and Mine Safety
CONT

CANMET, Denison Mines Ltd. and Rio Algon Ltd. were involved in a joint study to evaluate instrumentation of roof falls. Two test stopes at Denison and Quirke Mines were instrumented with extensometers, convergence meters, rock bolt load cells, rock permeability and microseismic devices.

French

Domaine(s)
  • Exploitation minière (dangers et sécurité)
CONT

Le CANMET, Denison Mines Ltd. et Rio Algon Ltd. ont collaboré à une étude visant à évaluer les instruments de mesure des effondrements de toit. Deux chantiers d'essai, situés dans les mines Denison et Quirke, ont été équipés d'extensiomètres, d'enregistreurs d'affaissement, de cellules piézométriques pour boulon, d'appareils de mesure de la perméabilité de la roche et des microséismes.

Spanish

Save record 6

Record 7 1986-10-06

English

Subject field(s)
  • Mining Operations
CONT

... a microseismic monitoring system... is used to locate the sources of the rockbursts. Computer programs were developed so that rockburst locations could be immediately viewed or printed on digitized mine plans.

French

Domaine(s)
  • Exploitation minière
CONT

(...) un système de monitorage microsismique (...) sert à repérer les sources de coups de toit. Des programmes informatiques ont été mis au point pour visualiser ou imprimer immédiatement sur des plans de mine numérisés les zones de coups de toit.

Spanish

Save record 7

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