To determine the effect of crustal thickness variation on satellite-altitude geopotential anomalies we compared two regions of Europe with vastly different values, South and Central Finland and the Pannonian Basin. In our study regions, crustal thickness exceeds 44 km in Finland and its average value is 22-26 km in the Pannonian basin. Heat flow data indicate that the thinner and more active crust of the Pannonian basin has a value nearly three times that of the Finnish Svecofennian Province. An ovoid positive CHAMP gravity anomaly (-4 mGal) is quasi-coincidental with the CHAMP magnetic anomaly traverses the gravity anomalies across the Pannonian basin. While ground based gravity mapping in Hungary shows that the free-air gravity anomalies across the Pannonian basin are near 0 to +20 mGal with shorter wavelength anomalies from +40 to <+60 mGal and some 0 to >-20 mGal. Larger anomalies are detected in the mountainous areas. The minor value anomalies can indicate the isostatic equilibrium for Hungary (the central part of the Pannonian basin). Gravity data over Finland are complicated by de-glaciation. CHAMP gravity data indicates a west-east positive gradient of >4 mGal across South and Central Finland. CHAMP magnetic data (400 km) reveal elongated semi-circular negative anomalies for both regions with South-Central Finland having larger amplitude (<-6 nT) that over the Pannonian basin, Hungary (<-5 nT). In both regions subducted oceanic lithosphere has been proposed as the anomalous body.
|Translated title of the contribution||Effect of varying crustal thickness on CHAMP geopotential data|
|Number of pages||6|
|State||Published - Sep 29 2005|
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