What would cause VibeZ to be large?

@larsks wrote:

I'm flying a Tarot 650 frame with ArduCopter 3.4.6 (Pixhawk, 4114 300KV motors w/ 15 inch props). It flies reasonably well, but I'm trying to track down some vibration issues that are causing jitter in my videos. While VibeX and VibeY seem to be reasonable, based on the Measuring Vibration document, VibeZ is substantially larger.

Here is a graph of Vibe{X,Y,Z} from two recent AUTO mode flights:

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vibe.png1200x600 50.7 KB

What could cause VibeZ to be so much larger than Vibe{X,Y}?

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