Tilting variations and seisruieity that preceded the strong Friuli earthquake of May 6th, 1976

P. F. Biagi, P. Caloi, M. Migani, M. C. Spadea


In a long 1970 work on the seismic and geodynamic characteristics
of the Po Valley (to be understood in the broadest sense,
that is, as including the Adriatic-Po, trough and all the beds and
basins of the rivers emptying into the upper Adriatic as well as the
mountains bordering it), Caloi et al observed, in commenting an the
diagram of seismic energies in recent centuries up to 1969, with particular
reference to the last century, that:
"It began with the strong earthquake of Santa Croce in 1875,
which suddenly broke the relative seismic quiet that had endured
throughout the broad zone since 1800. The disastrous seismic crisis
of the Lake Santa Croce zone was followed that same year by strong
seismic activity on the opposite side of the plain, at Cattolica near
the sea, along the northern Appennine slopes. It almost seems that
these violent ruptures of the seismic equilibrium on the two sides of the
plain were linked as cause and effect, and vice versa. The same phenomenon
occurred at other times during the past century: the strong
Adriatic earthquake of 1934 (Caloi, 1937) ('), for example, was followed
two years later by the very strong earthquake of Cansiglio (Caloi,

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DOI: https://doi.org/10.4401/ag-4798
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X