Geodetski list, Vol. 65 (88) No. 3, 2011.
Review article
Geomagnetic Elements Determination on the Selected Locations with the Red Soil (Terra Rossa)
Danijel Šugar
orcid.org/0000-0002-7796-9915
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Enio Jungwirth
; Ministry of Defence of the Republic of Croatia, Zagreb, Croatia
Milan Rezo
; Faculty of Geodesy, University of Zagreb, Zagreb, Croatia
Abstract
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.
Keywords
geomagnetic elements; total intensity gradients; red soil (terra rossa); chemical analysis; geomagnetic network for field mapping
Hrčak ID:
77843
URI
Publication date:
30.9.2011.
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