Ilus IV / New Terra calculations

Nagomi says:
* Seismic quake - 1hr
* shockwave at the speed of sound
1,235 km/h * 8-10h for tsunami to come around the planet
* Tsunami 10 h after that 
* Wiki says Tsunami is 3km wall.

Earth diameter is 12,756 km.
Wiki says that Ilus IV is about 13,000 km, 1 atm.

Diameter (arc) of shockwave around the planet is 9880 - 12350 km

Planet has minimum d*r circumference, greater than 9880 / PI = 3145 - 3931 km.