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| Titel |
Ground effects and hydrological changes in the Southern Apennines (Italy) in response to the 23 July 1930 earthquake (MS=6.7) |
| VerfasserIn |
E. Esposito, R. Pece, S. Porfido, G. Tranfaglia |
| 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. 2 ; Nr. 9, no. 2 (2009-04-03), S.539-550 |
| Datensatznummer |
250006720
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| Publikation (Nr.) |
 copernicus.org/nhess-9-539-2009.pdf |
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| Zusammenfassung |
| The 23 July 1930 earthquake (MS=6.7) in the Southern Apennines (Italy) was a
catastrophic event that produced many effects such as surface faulting,
fractures, landslides, settlements, hydrological changes, variations in
chemical/physical activity related to the volcanic and/or thermal zones and
also acoustic and optical phenomena. It is the first great earthquake of the
twentieth century that was studied, thanks to the hydrological monitoring
network of the Italian Hydrographic Survey (IHS) set up from 1925 to 1929.
For this earthquake we analysed the initial IHS hydrometric and pluviometric
data, looking for significant anomalies in springs, water wells and mountain
streams. Hydrological data relative to rivers, springs and water wells
indicate that some changes can be correlated with the earthquake: a
post-seismic excess discharge in some streams, pre- and co-seismic decreases
in stream flows and water levels in wells, pre- and post-seismic increases in
discharges. The pre- and co-seismic stresses and the tectonic deformations
were studied in order to find a possible model of interaction between stress
state and hydrological variations. The anomalies found in this work can be
considered "rebound anomalies", which are the most common precursor reported
by many authors and related to increases in porosity and permeability caused
by the fracturing that precedes an earthquake. An estimation of the total
excess discharge (0.035 km3) caused by the MS=6.7 Irpinia earthquake is
consistent with the excess discharge of about 0.01 km3 determined for the
Mw=6.9 Loma Prieta earthquake. |
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