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I would find that very surprising. Mercury-quakes would be okay, but earthquakes happen only on Earth.

Even Mercury-quakes would be surprising, especially frequent and violent ones. The evidence that we can see on the surface does not support that idea.

Seismographs placed on the surface of Mercury record frequent and violent earthquakes?

Supposing that I am making a discovery (not real discoveries), which would it be reasonable or surprising?

Earth have earthquake
Moon have a rare "moonquake", caused either by meteoric impact, tidal effect, slumping crater rim, or extreme change of heat.
Mars have "marsquake" which mechanism is still a mystery, but probably caused by landslides.
Venus have "Venusquake"
Io have "Ioquake" caused by tidal and volcanic activities.
Ganymede have plate tectonics like earth does, so of course it has
"Ganymedequake"
Enceladus and Triton have shifting surfaces, so it also have Enceladusquake and Tritonquake.

AS for Mercury

I would say it is very likely to have a quake (although probably very rare). Mercury have same extreme temperature change as the moon does, and it has elliptical orbit which can caused extreme tidal changes, so it is very likely for Mercury to have a Mercuryquake, even though it should be rare (because Mercury' surface is old, with lot's of craters, so earthquake should be rare)