258 Determination of Mean Sea Surface and Free-Air Gravity Anomalies Using Satellite Alimeter Data in The Faeroes Islands Region PER KNUDSEN Geodaetisk Znstitut, Gamlehave Alle 22, DK-2920 Charlottenlund (Sweden) From SEASAT altimeter data the mean sea surface has been determined using a cross-over adjustment which has reduced differences between values from crossing arcs. This surface is assumed to be the equipotential surface of the earth’s gravity field called the geoid. Then free-air anomalies are determined using least squares collocation. In the Faeroes Islands region the method used in the cross-over adjustment has been evaluated and the predicted anomalies have been compared with measured values. Geoelectric Structure of the Earth’s Crust along the Sveka Profile K. KOIVUKOSKI, T. KORJA, and S.E. HJELT Department of Geophysics, University of Oulu, SF-90570 Oulu 57 (Finland) Magnetotelluric (MT) and audiomagnetotelluric ( AMT) soundings have been performed on the SVEKA profile and its southward continuation. First five MT soundings were carried out as a joint work by the university of Oulu and the Hungarian Academy of Sciences in 1980. Since then three AMT-pro- files on the central part of the SVEKA and altogether 65 deep MT soundings along the whole profile have been measured. The profile runs from Kuhmo in eastern Finland to Hameelinna in southern Finland crossing several geological units. From east to south these units are the Karelidic realm, the Ladoga-Bothnia Bay zone, the central Finland gran- itoidal complex and the Tampere Schist belt. The length of the profile is about 560 km. This paper describes electromagnetic measurements performed along the profile and gives the geoelectric structure of the profile. Results will be compared with results of deep seismic soundings and with results of other available geophysical methods.

Determination of mean sea surface and free-air gravity anomalies using satellite alimeter data in the Faeroes islands region

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Determination of Mean Sea Surface and Free-Air Gravity Anomalies Using Satellite Alimeter Data in The Faeroes Islands Region

PER KNUDSEN

Geodaetisk Znstitut, Gamlehave Alle 22, DK-2920 Charlottenlund (Sweden)

From SEASAT altimeter data the mean sea surface has been determined using a cross-over adjustment which has reduced differences between values from crossing arcs. This surface is assumed to be the equipotential surface of the earth’s gravity field called the geoid. Then free-air anomalies are determined using least squares collocation.

In the Faeroes Islands region the method used in the cross-over adjustment has been evaluated and the predicted anomalies have been compared with measured values.

Geoelectric Structure of the Earth’s Crust along the Sveka Profile

K. KOIVUKOSKI, T. KORJA, and S.E. HJELT

Department of Geophysics, University of Oulu, SF-90570 Oulu 57 (Finland)

Magnetotelluric (MT) and audiomagnetotelluric ( AMT) soundings have been performed on the SVEKA profile and its southward continuation. First five MT soundings were carried out as a joint work by the university of Oulu and the Hungarian Academy of Sciences in 1980. Since then three AMT-pro- files on the central part of the SVEKA and altogether 65 deep MT soundings along the whole profile have been measured.

The profile runs from Kuhmo in eastern Finland to Hameelinna in southern Finland crossing several geological units. From east to south these units are the Karelidic realm, the Ladoga-Bothnia Bay zone, the central Finland gran- itoidal complex and the Tampere Schist belt. The length of the profile is about 560 km.

This paper describes electromagnetic measurements performed along the profile and gives the geoelectric structure of the profile. Results will be compared with results of deep seismic soundings and with results of other available geophysical methods.