Određivanje geomagnetskih elemenata na odabranim lokacijama sa zemljom crvenicom

Autor: Danijel Šugar, Enio Jungwirth, Milan Rezo
Jazyk: chorvatština
Rok vydání: 2011
Předmět:
Zdroj: Geodetski list
Volume 65 (88)
Issue 3
ISSN: 1849-0611
0016-710X
Popis: Prikazani su rezultati istraživanja utjecaja zemlje crvenice i pripovršine nepoznata sastava i prostiranja na određivanje geomagnetskih elemenata. Terenska su mjerenja obavljena na četiri lokacije Hrvatske geomagnetske mreže za kartiranje polja prekrivene zemljom crvenicom na području južne i zapadne Istre. Osim točaka s niskim gradijentima, opažanje D, I, F provedeno je i na obližnjim točkama s visokim gradijentima totalnog intenziteta. Na razmatranim lokacijama pronađene su maksimalne razlike D od 8'56'', razlike I od 7'02' i razlike F od 67,2 nT, i to na udaljenostima od 40-ak do 330-ak metara. Opažanja D, I na različitim visinama DIM potvrdila su ispravnost kriterija maksimalnih gradijenata od 3 nT/m pri uspostavi i izmjeri geomagnetskih točaka. Magnetska svojstva uzoraka crvenice sa svih razmatranih točaka utvrđena su opažanjem polja na geomagnetskoj sekularnoj točki POKUpsko tijekom mirnih uvjeta. Provedena je kemijska analiza uzoraka crvenice s lokacije KRNIca za koje je utvrđena najveća razlika magnetskog utjecaja.
The results of investigation of the red soil and subsurface of unknown composition and spreading on the geomagnetic elements determination are presented. Geomagnetic field surveys took place on four locations of the Croatian Geomagnetic Network for Field Mapping covered with red soil on the territory of southern and western Istria. In addition to the points with low gradients, the D, I, F observations were performed on the nearby points with high total intensity gradients. The maximum differences in D (8'56''), I (7'02'') and F (67.2 nT) were found on the investigated locations at the distance of approx 40 m to 330 m. The acceptability of the 3 nT/m maximum gradient criterion for the establishment and survey of geomagnetic stations was proved by D and I observations at different DIM heights. Magnetic properties of the red soil samples from all investigated locations were determined during total intensity observations at POKU repeat station in quiet magnetic conditions. The chemical analysis of the red soil samples from KRNI location with maximum difference in magnetic properties was performed.
Databáze: OpenAIRE
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