Gravity and Elevation changes at Askja , Iceland

  title={Gravity and Elevation changes at Askja , Iceland},
  author={Hazel Rymer and EYSTEINN TRYGGVASON},
Ground tilt measurements demonstrate that Askja is in a state of unrest, and that in the period 1988 1991 a maximum 48 +/3 μrad tilt occurred down towards the centre of the caldera. This is consistent with 126 mm of deflation at the centre of the caldera with a 2.5 3.0 km depth to the source of deformation. The volume of the subsidence bowl is 6.2 x 106 m3. When combined with high precision microgravity measurements, the overall change in sub-surface mass may be quantified. After correction for… CONTINUE READING