Abstract
Abstract A method of precise lake level observations has been tested at lake Myvatn since June 1984. Twelve observations over a period of 21 months show that this method is useful in detecting relative vertical ground displacements which exceed one millimeter. Ground deformation during and after the September 1984 eruption of Krafla was observed to closely approximate planar tilt of about 3.0 microradians down towards N 23°E during the eruption followed by tilt of about 2.0 microradians down towards south or slightly west of south. Reliable lake level measurements can only be obtained in calm weather or when the lake is under ice. Seiches of 40-min period were observed for less than 24 hours after strong southerly winds.
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