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| Titel |
Co-postseismic hydrogeochemical anomalies in a volcanic environment |
| VerfasserIn |
P. F. Biagi, O. Molchanov, R. Piccolo, A. Minafra, A. Ermini, V. Capozzi, Y. M. Khatkevich, E. I. Gordeev |
| 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 ; 3, no. 3/4 ; Nr. 3, no. 3/4, S.263-267 |
| Datensatznummer |
250000686
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| Publikation (Nr.) |
 copernicus.org/nhess-3-263-2003.pdf |
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| Zusammenfassung |
| For many years
flow-rate, temperature, ions and gases content data have been collected
from a natural spring located in the Koryakskiy volcano area (Kamchatka,
Russia). We have investigated the correlations between the
hydrogeochemical data and the areal seismicity represented by the ks
values (ks is a function of magnitude
and hypocentral distance) of the earthquakes. At first we smoothed the raw
hydrogeochemical data using a semi-triangle weight function. Then we
compared the trends of each smoothed hydrogeochemical parameter with the ks
trend using a running cross-correlation function with a maximum lag of ±
30 days and the main result was that, sometimes, we found 0.7–0.4
cross-correlation coefficients with no lag for flow rate and with + (10 – 15) days lags for some ion and gas contents. The correlation is positive,
i.e. flow rate and ion and gas contents increase when ks
increases. This phenomenology could be explained by an underground water
pumping produced by some earthquake. We advance the hypothesis that this
pumping could be the response of the viscoelastic underground medium of
the Koryakskiy volcano to seismic waves. So, sometimes, the supply of
elastic energy of the earthquakes may provide the trigger to a
catastrophic nucleation of bubbles of this material producing a new melt
with a lower density which will tend to expand and cause a pressure
increase. This pressure produces a more intensive circulation of
underground water and an anomalous increase of the flow rate and
subsequently anomalous increases in groundwater ions and gases content. |
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