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Hydrogeological Changes Related to the Umbria–Marche Earthquake of 26 September 1997 (Central Italy)

Author

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  • Monica Carro
  • Mattia Amicis
  • Lucia Luzi

Abstract

Evidences of variations of the hydrologic regime have been observed after the Umbria–Marche seismic sequence, started on September 26th 1997, at the boundary between Umbria and Marche regions, central Italy. In order to quantify the hydrological variations, several data regarding groundwater level, spring discharge and river flow rates, have been collected from local authorities and mineral water companies. They allowed to confine the area affected by anomalies and to quantify the hydrological variations by a comparison with the average yearly regime, estimated from the data referring to previous years. An attempt to identify precursor phenomena has also been carried out. The results of the analysis sustain the close connection of two water reservoirs, the Umbria–Marche ridge and the Valnerina unit, that have both been affected by changes of the hydrologic regime. Two of the river gauge stations registered anomalies several months before the crisis started, acting as earthquake precursors. Copyright Springer 2005

Suggested Citation

  • Monica Carro & Mattia Amicis & Lucia Luzi, 2005. "Hydrogeological Changes Related to the Umbria–Marche Earthquake of 26 September 1997 (Central Italy)," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 34(3), pages 315-339, March.
    • Handle: RePEc:spr:nathaz:v:34:y:2005:i:3:p:315-339
    DOI: 10.1007/s11069-004-2074-0
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