I would definitely put Yatwer and Gilgaol in a somewhat special place in the hierarchy. They are basically polar opposites, and together create the engine that cycles souls through life and death. And, as Wilshire mentioned, there is an abundance of evident miracles on Yatwer's behalf, and as of TGO, the only god we've seen genuinely incarnated (for lack of a better word) it would seem is Gilgaol, during the extended Celmomian Prophecy.
All that being said, I'm still somewhat divided on whether the instances of visible power we've seen from Yatwer is because of something unique to the deity, or if it's simply all the audience has been shown, and the other Hundred have yet to appear so vividly on-screen thus far (as Yatwer was depicted in the first trilogy, for example). I'm inclined toward it being a bit of both.
ETA:
That said, I don't think Yatwer was the entirety of the cause of the earthquake (Earwaque? Earwaquake, Earwake... whatever). All of her manipulations were mostly nudges through people. The closest thing we saw was when the WLW's tenant building collapsed, and we got to see the cause-and-effect chain for hundreds of years in the past.
Maybe she nudged the builders to use mediocre materials in one part of the wall, or place a vulnerable point of the wall directly over the faultline - this kind of thing. If she knew there would be an ground-shaking-event such a thing would be fairly reasonable. Like you said, it opens up to many questions if its as simple as "Yatwer reached down to Earwa, and with her hands, split the ground asunder".
The earthquake was actually caused by Momas, not Yatwer, for what it's worth. Not sure how I'd even define "cause" here really, as you implied.
Also, the one possible outlier among Yatwer's interventions being more like nudges (which I otherwise agree with) is when she embodies herself out of dead sranc. The actual motivation for the characters is still sort of in the "nudge" category, but so far as outright displays of power over material reality, it's a pretty big one.
Idle thought: it's interesting that Yatwer and Gilgaol both manifest (in their own fashion) using the remains of the dead. Can't help but be reminded of how Sil is described as "wearing the festering bodies" of the fallen.