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| Titel |
Clues to the identification of a seismogenic source from environmental effects: the case of the 1905 Calabria (Southern Italy) earthquake |
| VerfasserIn |
A. Tertulliani, L. Cucci |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 6 ; Nr. 9, no. 6 (2009-11-05), S.1787-1803 |
| Datensatznummer |
250007049
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1787-2009.pdf |
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| Zusammenfassung |
| The 8 September 1905 Calabria (Southern Italy) earthquake belongs to a
peculiar family of highly destructive (I0=XI) seismic events, occurred
at the dawning of the instrumental seismology, for which the location,
geometry and size of the causative source are still substantially
unconstrained. During the century elapsed since the earthquake, previous
Authors identified three different epicenters that are more than 50 km apart
and proposed magnitudes ranging from M≤6.2 to M=7.9. Even larger
uncertainties were found when the geometry of the earthquake source was
estimated. In this study, we constrain the magnitude, location and kinematics
of the 1905 earthquake through the analysis of the remarkable environmental
effects produced by the event (117 reviewed observations at 73 different
localities throughout Calabria). The data used in our analysis include ground
effects (landslides, rock falls and lateral spreads) and hydrological changes
(streamflow variations, liquefaction, rise of water temperature and
turbidity). To better define the magnitude of the event we use a number of
empirical relations between seismic source parameters and distribution of
ground effects and hydrological changes. In order to provide constraints to
the location of the event and to the geometry of the source, we reproduce the
coseismic static strain associated with different possible 1905 causative
faults and compare its pattern to the documented streamflow changes. From the
analysis of the seismically-induced environmental changes we find that: 1)
the 1905 earthquake had a minimum magnitude M=6.7; 2) the event occurred
in an offshore area west of the epicenters proposed by the historical seismic
Catalogs; 3) it most likely occurred along a 100° N oriented normal
fault with a left-lateral component, consistently with the seismotectonic
setting of the area. |
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