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 "description": "Magneettinen menetelmä on vanhin ja yleisin geofysiikan menetelmistä. Geologian tutkimuskeskuksessa (GTK) magneettisia mittauksia on tehty 1940-luvulta lähtien. Aluksi mittaukset tehtiin fluxgate-magnetometreillä, mutta vuonna1984 siirryttiin käyttämään yksinomaan protonimagnetometreja jotka ovat huomattavasti tarkempia instrumentteja. Cesium magnetometrejä käytetään UXO-tutkimuksissa (unexplode ordnance), joissa paikannetaan järveen tai mereen upotettuja räjähtämättömiä ammuksia.\nMagneettinen menetelmä on vanhin ja yleisin geofysiikan menetelmistä. Geologian tutkimuskeskuksessa (GTK) magneettisia mittauksia on tehty 1940-luvulta lähtien. Aluksi mittaukset tehtiin fluxgate-magnetometreillä, mutta vuonna1984 siirryttiin käyttämään yksinomaan protonimagnetometreja jotka ovat huomattavasti tarkempia instrumentteja. Cesium magnetometrejä käytetään UXO-tutkimuksissa (unexplode ordnance), joissa paikannetaan järveen tai mereen upotettuja räjähtämättömiä ammuksia. \nMagneettisia mittauksia on tehty hajaprofiilimittauksina ja systemaattisina mittauksina. Hajaprofiilimittaukset ovat yksittäisiä lähinnä tunnusteluluontoisia mittauksia.  Systemaattisissa mittauksissa on yleisesti käytetty 50-100 metrin linjaväliä ja 10-20 metrin pisteväliä ja mittauslinjojen suunta on valittu paikallisen geologian mukaan. Mittauksia on tehty eri puolilla Suomea lähinnä malminetsinnän tarpeisiin. \nMagneettisissa mittauksissa mitataan Maan magneettikentän aiheuttamaa magneettivuon tiheyttä tai sen jotain komponenttia, tavallisimmin totaali- tai pystykomponenttia, maan pinnalla. Magneettisten ominaisuuksien vaihtelu maankamarassa aiheuttaa paikallisia magneettisia anomalioita.  Anomaliasta voidaan tulkita magnetoituman sijaintia, laajuutta, syvyyttä, asentoa ja voimakkuutta.  Menetelmän etuna on hyvä erotuskyky ja syvyysulottuvuus ja siten mittauksia käytetään laajasti eri tarkoituksiin. \n/\nThe magnetic method is the oldest and most widely used of the geophysical methods. The Geological Survey of Finland (GTK) has conducted magnetic measurements since the 1940s. Initially, such measurements were carried out using fluxgate magnetometers but, in 1984, GTK adopted the use of the proton magnetometer, an instrument that is considerably more precise. Cesium magnetometers are used in UXO (unexploded ordnance) exploration to locate unexploded explosives at the bottom of lakes or on the seabed. \nMagnetic measurements have been conducted in the form of geophysical profile and systematic measurements. Geophysical profile measurements refer to one-off operations, carried out principally with a tentative purpose.  Systematic measurements commonly make with a line spacing of 50 to 100m and a sample distance of 10 to 20m, and the line direction is selected on the basis of local geology. Measurements have been carried out throughout Finland mainly for mineral exploration purposes. \nMagnetic surveys measure the magnetic flux density of the Earth\u2019s magnetic field or its component(s), usually the total or vertical component, observable on the Earth's surface. The alteration of magnetic properties in the Earth's crust cause local anomalies.  Interpretation of such anomalies provides information on the location, extent, depth, orientation and strength of the magnetisations in question. The advantages of this method are its high resolution and excellent downward reach, making it widely used in a variety of applications.",
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