 |
| Titel |
An automatic monitoring network installed in Tuscany (Italy) for studying possible geochemical precursory phenomena |
| VerfasserIn |
R. Cioni, M. Guidi, L. Pierotti, A. Scozzari |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 3 ; Nr. 7, no. 3 (2007-06-14), S.405-416 |
| Datensatznummer |
250004545
|
| Publikation (Nr.) |
 copernicus.org/nhess-7-405-2007.pdf |
|
|
|
|
|
| Zusammenfassung |
Since late 2002, a continuous automatic monitoring network (CAMN) was
designed, built and installed in Tuscany (Italy), in order to investigate
and define the geochemical response of the aquifers to the local seismic
activity. The purpose of the investigation was to identify eventual
earthquake precursors. The CAMN is constituted by two groups of five
measurement stations each. A first group has been installed in the Serchio
and Magra graben (Garfagnana and Lunigiana Valleys, Northern Tuscany), while
the second one, in the area of Mt. Amiata (Southern Tuscany), an extinct
volcano. The measured parameters are: T, pH, Eh, EC, dissolved CO2 and
CH4. The results of three years of continuous monitoring can be
summarised as follows: i) the monitoring stations made it possible to detect
even small variations of the measured parameters, with respect to equivalent
commercial devices; ii) acquired data made it possible to identify the
groundwater circulation patterns; iii) in most locations, the observed trend
of the acquired parameters is consistent with the periodic manual sampling
results, and confirms the mixture of different water types that the
hydrogeochemical model has determined.
The absence of seismic events with a sufficient energy precluded the
possibility to locate anomalies, with the only exception of the Equi Terme
site, where an increase in the dissolved CO2 content was observed
twelve days before a M=3.7 earthquake occurred at a distance of 3 km north
of the monitoring station.
The CAMN resulted as being a suitable tool in order to investigate the
anomalous variations of the physical, physico-chemical and chemical
parameters of aquifer systems as earthquake precursors. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|