It appears the activity off southern Taiwan is the result of a strike-skip fault or faults, a new term for me.

Here are a few more new ones for you (taken from your earthquake resources page):

"Typical subduction trench-accretionary wedge-forearc basin-volcanic arc type
configuration is observed in the southern part of the study area"

Even if you condensed it to an acronym and called it - STAWFBVATC - it's still quite a mouthful.

The 'strike-skip fault' that you refer to is, i think, also commonly known as the 'strike-slip' fault - the kind where the plate boundaries slide past each other in a roughly horizontal way.

The other main kinds seem to be 'dip-slip faults' - where the plates move up or down against each other. The 'thrust fault' is one of these and that was the kind that caused the Boxing Day tsunami.

I assume it's only these up-down kinds that can cause tsunamis.

You're right about the frogs, though they look more like toads to me - i was drving down my drive the other night and it looked like a biblical plague of them.