Spell Tremor Blast, Combat Maneuver

[Dogfax]

Good day all,
I have looked everywhere for the answer to this and could find nothing, so maybe I am looking for something that does not exist, but for the spell Tremor Blast the caster makes one Combat Maneuver check.....so is this just a regular Str based one or different as it is a spell caster CM?? I ask as a lot of these types of spells specify to use Int/Wis/etc for the caster but this does not. Seems a rather pointless spell for a Sorcerer/Wizard/Witch if just a regular CM check....

Has anyone seen any clarification on this spell pls?

Thanks in advance.

[avr]

It's also usable by druids, hunters, clerics, oracles, inquisitors and bloodragers, who might have higher CMB. There's no 'clarification' because it doesn't need such.

BTW, the actual spell name is Rovagug's Fury.