Investigation of pre-1700 Earthquakes Between the Adda and the Middle Adige River Basins (Southern Alps) - Historical Seismology: Interdisciplinary Studies of Past and Recent Earthquakes - page 94

[My answer is that one month ago someone said there was some shaking at the beginning
of the day, but it was so short and so light that few people accounted for it and, like an
uncertain event, it was not recorded].
In addition, the investigation by Gazzini et al. (1991) clearly shows how the impact
of the event was then increased by the later compilers of local histories (Fig. 4).
Although it cannot be demonstrated in a paradigmatic way, this trend seems to be
similar for other events, too. For instance, the work of Corio (1503) represents the
basis for all later historical compilations for the Milano area. The later users of his
work extended to other localities the information he referred to Milano or Lombardy.
This is the case, for instance, of the already mentioned earthquake of 1287, which
Fig. 4 The effects and the damage area of the earthquake of May 7, 1473 were increased from the
coeval sources by the later compilers of local histories