Abstract
The Ridracoli Dam has been operating since 1981. Around the reservoir ISMES installed and operated for 10 years a seismic network, now reduced to a 3-D station. Earthquakes were recorded with completeness from magnitude 0.8 onwards. In the same period, all the parameters relevant to the dam and the environment were measured. This provided a complete data base for RIS studies, unique in its kind in Italy. The main findings of the analyses performed are the following:
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1)
The filling of the reservoir has not influenced the seismicity of the area for most significant events (M L>3.5).
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2)
Lesser seismicity around the reservoir seems to be correlated with water level in the reservoir, but also shows to be dependent on regional seismicity.
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3)
b value shows a slight increase with time. This may indicate an increase in rock fracturing, which is known to precede the disappearing of Type II RIS.
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Piccinelli, F.G., Mucciarelli, M., Federici, P. et al. The microseismic network of the Ridracoli Dam, North Italy: Data and interpretations. PAGEOPH 145, 97–108 (1995). https://doi.org/10.1007/BF00879486
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DOI: https://doi.org/10.1007/BF00879486