No, absolutely not - gravity is an inverse distance squared force.

The sun dominates our gravity environment and planets at those distances have negligible effects (really effectively zero) certainly not seismic size perturbations!

The gravitational force from the other planets does slightly affect the Earth's orbit, but the gravitational pull from the other planets and the Moon is still very small. The gravitational pull of the Moon on the Earth is only 0.55% of the gravitational force between the Sun and the Earth, other planets even less than that. Unlikely, very unlikely to trigger earthquakes!

> - The physics community chimes in? I mean the effect could only be due to gravity unless there is another mechanism we don't understand. But given how small the earth is, and how big other planets are, I'd suspect the physics people to see this effect somewhere else?

To be totally honest, we don't actually know what specifically causes earthquakes. That is to say, we understand that earthquakes are essentially the sudden, violent release of stress due to crustal deformation, but we don't have great ideas for understanding what causes the stress to be released so violently. As a result, even basic tasks like earthquake forecasting or merely distinguishing a mainshock from a foreshock (before the mainshock occurs) have turned out to be miserable failures.

But as for planetary orientations having an effect via gravity... well, let me put it in perspective. To exert the same gravitational pull on an object on Earth as Jupiter does, the average human being would have to stand does math 15cm away.