Aeromagnetic measurements over Mýrdalsjökull and vicinity

Abstract

Aeromagnetic survey results from the Mýrdalsjökull glacier region, acquired by Th. Sigurgeirsson around 1970, have been reprocessed in combination with data from a new survey. The main feature of the residual magnetic field over Mýrdalsjökull is a localized 8 x 12 km negative anomaly, of around-2000 nT amplitude relative to the regional field. Models of the crust indicate that it is caused partly by the subglacial topography and partly by a thermal anomaly associated with a possible magma chamber beneath the Katla caldera.