Meant to do this a long time ago.
G1 Applejack shatters a hole in the ground so strong that it sends the Jewel wizard "to the end of the earth".
"The end of the earth" is super vague to say the least, but I assume it means the center of the earth.
The center of the earth is 6,371 km (6,371,000 meters) deep. We don't know how wide the crater is, or ow long, so I'll assume both are as told as the Wizard himself. I'll assume the wizard is 5 feet or 1.524 meters tall. That give us a radius of 0.762 m
Volume of a cylinder.
pi * 0.762^2 * 6,371,000 = 11,621,640 m^3 (1.162164e+13 cm^3). Going to assume fragmentation. Not sure how to handle stuff like this where the ground itself opens.
1.162164e+13 * 8 = 9.297312e+13 J
22.22 Kilotons
Town level
Might not scale to her (not sure if it was her or the wizard who did it), but it's nice to have.