**1. Introduction**

In Sweden, we have documented 62 high-magnitude paleoseismic events in postglacial time [1, 2]. Most of those occurred in subaqueous environment and 17 events set up tsunami waves [3]. All the 62 events are documented by multiple criteria and most of them are very precisely dated.

With recording by multiple criteria, I mean the recording of one and the same event in faults and fractures, in sedimentary deformations, in liquefaction characteristics and spatial distribution, in earth- and rockslides, in height and extension of tsunami waves, in distribution and age of turbidites, etc.

With very precise dating, I mean dating with a resolution as to a single year (sometimes even the season of a year) in the Swedish Varve Chronology [4].

Therefore, studies in those uplifted former shelf areas may help us to understand the mode of offshore deformation and the special characteristics of structures created [5, 6].

Sweden with its bordering Baltic Sea and Kattegat Sea were previously thought to be tsunamifree parts of the world. In 1995, we found the first evidence of a major tsunami wave that took place in the autumn of varve 10,430 BP [7]. It was soon followed by the documentation of

another big tsunami event in the varve-year 9663 BP [8, 9]. Today, we have a list of 17 events [1, 3, 6]. In this chapter, I will discuss five of them in terms of case studies from this part of the world.
