Since i have been here most of the major quakes have occured in the north, central and central-east coast regions and a quick check of records shows that historically, that's where they usually happen. Major earthquakes in the south are pretty rare - the biggest in the Taidong area in recorded history seems to be a 6.1 in Dec 2, 1943, causing 139 deaths.
The biggest known tsunami causing earthquake occured in 1867 off the coast of Keelung - it resulted in hundreds of deaths.

Here's a list of the biggest ones to have affected TW in the last couple of hundred years.

http://en.wikipedia.org/wiki/List_of_earthquakes_in_Taiwan

I can't find any record of a major earthquake happening in the Kaohsiung area. Are you saying that you think the recent earthquake there could be a sign of future activity there, or rather that it may be a trigger for earthquakes in other places?