It is currently 180 meters long and 20 meters wide.
Fracture is the tenth of the cracks that have appeared in this ranch in recent years.
"This is three times bigger than all the other cracks we've seen before," said Scott Scott, a volcanologist at GNS Science.
Scientists were interested in the tomo, after it turned out to be formed above the crater of the ancient volcano that erupted for the last time 60,000 years ago.
A similar phenomenon occurred in the Black Continent early last month, with a massive 20-meter-long, 15-meter-long incline that spanned several kilometers on land near Nairobi, Kenya.