The Case for Large Earthquakes Felt in the UK in Historical Times - Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes - page 186

Fig. 2 Likely extent of isoseismals from a 7 Mw earthquake located on the edge of the
Hebrides Shelf
there are plenty of alternative explanations, including (a) that the epicentre was in a
remote part of England or Wales; (b) that the chronicler felt it not worth mentioning
that the cottages of mere peasants were thrown down; (c) “throughout England” is
an exaggeration for “here and in the next town as well”.
In the next section some particular case studies are considered in detail (see
Table 1).