pure and applied geophysics

, Volume 145, Issue 1, pp 97–108 | Cite as

The microseismic network of the Ridracoli Dam, North Italy: Data and interpretations

  • F. G. Piccinelli
  • M. Mucciarelli
  • P. Federici
  • D. Albarello
Article

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:
  1. 1)

    The filling of the reservoir has not influenced the seismicity of the area for most significant events (ML>3.5).

     
  2. 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.

     
  3. 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.

     

Key words

Microseismic reservoir-induced seismicity nonparametric correlation analysis b values 

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Copyright information

© Birkhäuser Verlag 1995

Authors and Affiliations

  • F. G. Piccinelli
    • 1
  • M. Mucciarelli
    • 2
  • P. Federici
    • 2
  • D. Albarello
    • 3
  1. 1.Consorzio Acque per le province di Forli e RavennaForliItaly
  2. 2.Divisione GeofisicaIsmes S.p.A.BergamoItaly
  3. 3.Dipart. di Scienze della Terra, Istituto di GeofisicaUniversità di SienaSienaItaly

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