High Res. DEM

Detailed radar measurements of the lava dome surface were made from Perches at a distance of only 1200m. This allowed extremely high resolution DEMs to be constructed with gas venting, cloud and disturbed ash from rockfalls made no difference to the quality of signal returned from the dome.  Growth was clearly visible, both in the photography and the radar data.

DomeChangeSmSubtracting the surface data of the second day from the first clearly reveals that the dome had three main lobes of growth between observations.

PerchesChange

The radar data was used to measure the volume added to the dome: 0.99 million cubic metres in ten days, which translated to an average flux of 1.1 ± 0.1 cubic metres per sec.

AVTIS had finally achieved its primary design aim: to measure the changing shape of a volcanic lava dome.