Greinar (Vísindafélag Íslendinga) - 01.01.1951, Side 45

Greinar (Vísindafélag Íslendinga) - 01.01.1951, Side 45
39 —15 mgal. in the center of the country. This interesting general picture remains quite uninfluenced by the poss- ible errors. The main result of our studies is thus, as shown in the isogal diagram where all gravity stations are indicated by small circles, that the Bouguer anomaly is about +50 to +55 mgals. along the southwest coast and decreases rather regularly toward the northeast as far as the center of the country.(!) The measurements of Ansel and Schleusener in north- east Iceland show, on the other hand, a positive Bouguer anomaly of 10 to 20 mgals. so that the values decrease both from the north and south toward the center. The general picture would appear to be that of a 60—70 mgal. deep gravity bowl. As it is intended to extend the measure- ments soon a further discussion of the results will be postponed. Besides the general tendency in the Bouguer anomalies the measurements reveal important local anomalies. At Kotströnd in ölfus, a fault line produces an anomaly of 8 mgals. The Bouguer anomaly decreases by 17 mgals. on a 10 km. line running from Selfoss to Sog. The Thing- vellir graben is marked by a conspicuous gravity ano- maly. At several other places there are also significant anomalies. But the points are, however, still far too few to give a reliable basis for a thorough discussion and inter- pretation. The detailed results of our measurements and reductions are given in the following table. The work of the French scientists was voluntary and the only costs were therefore traveling expenses, which were provided by: (1) It must be stated that a revision of the gravity reductions which was done after preparation of the map, revealed small errors in three points in the area south of Tungnaá river. But due to the

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Greinar (Vísindafélag Íslendinga)

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