Historic seismicity of Central Switzerland based on ECOS data with Io ≥ 5
Figure 2 reviews the known historic seismicity of the region
with Io ≥ 5.
Since it is a problem to locate epicenters accurately with only
macroseismic data, Fig. 2 includes the range of uncertainty.
The series in Altdorf (1774, 10 known events) as well as two
earlier series near Sarnen (1777, 11 known events but a
contemporary observer speaks of 60 felt shocks, and 19 events in
1917) show a pattern similar to that of 1964 (Fig. 2 and
Gisler et al.
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