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3.3 The Prealpine Margin
Apart from the aforementioned 1117 and 1222 earthquakes, which will be discussed
below, a little more than 20 events are reported by CPTI04 in the investigated area
and time-window. The relevant background consists of information from one or
two localities only; therefore, the parameters of these earthquakes are not very
reliable. The temporal and spatial distribution shows that the information mainly
comes from three localities: Bergamo, Brescia and Verona (Fig. 7). These cities
seem to represent the centre of the information in different periods: Brescia, during
the 11th-12th centuries and in the time-window 1470-1600; Verona, 1340-1470;
Bergamo, 1570-1670. Moreover, the seismic histories of the cities indicate that in
most cases the events are reported from only one of the mentioned localities (Fig. 8).
Fig. 7 Time vs energy
distribution of the
earthquakes in the alpine
margin, according to CPTI04.
Symbols show the main
origin of the information for
each earthquake; the number
of macroseismic observations
of each earthquake is
also shown
3.3.1 The Bergamo Area
3.3.1.1 1396, Monza (?)
This earthquake was reported by Postpischl (1985a) with the date of 26 Decem-
ber 1397; it was located in the Bergamo area, Io 8 MCS, Mm 5.2. ENEL (1985)
investigated another earthquake that appeared in the catalogue by Postpischl (1985a)
with the date of 26 November 1369, located in Milano, Io 7 MCS, Mm 4.7 and found
that it was nothing else than a duplication of the 1397 event. The earthquake was
then studied by Stucchi and Albini (1988) and Stucchi et al. (1993), mainly using
earthquake records from local historical compilations written between the 16th and
17th centuries (Table 2). From these studies an event emerges which caused damage
to Bergamo (Calvi, 1676), and was felt over a large area, including Alessandria
(Schiavina, 1616; Ghilini, 1666), Lodi (Agnelli, 1895), Verona (Zagata, 15th cent.),
Rovigo (Nicolio, 1582), Trento (Tovazzi, 1803) and Como (Tatti, 1683). The anal-
ysis of the records allowed Stucchi and Albini (1988) to assess that most of them,
with the possible exclusion of Tovazzi (1803), come from a single source (Corio,
1503), sometimes not explicitely quoted. Corio reports:
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