These may help:
An earthquake (also known as a quake, tremor or temblor) is the perceptible shaking of the surface of the Earth. Earthquakes can be violent enough to toss people around and destroy whole cities. Such earthquakes being caused by characters are a method useable to determine Attack Potency. For the...
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Assuming it's of course, an Earth-like planet.
On a semi-related topic, this may provide SOME insight:
As the video says, a Magnitude 10 would have a ruptured faultline 3,500 km long, & a Magnitude 11 would create a fault that went halfway around the world.
It's uncertain just what kind of destruction you mean by "a blast that crates[sic] a planetary quake that agitates the crust" (No offense meant.), but by the range alone, I'd assume it could be somewhere in that range. But I'm not 100% certain, & not a Calc Group Member.
This quake from the blast IS shown to noticeably affect the whole planet, right?
Anyway, hopefully some of these resources help.