Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6049
AuthorsBobbio, A.* 
Vassallo, M.* 
Festa, G.* 
TitleA Local Magnitude Scale for Southern Italy
Issue Date2009
Series/Report no.4/99(2009)
DOI10.1785/0120080364
URIhttp://hdl.handle.net/2122/6049
KeywordsLocal Magnitude
Southern Italy
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring 
AbstractA local magnitude scale has been defined for southern Italy, in the area monitored by the recently installed Irpinia Seismic Network.Waveforms recorded from more than 100 events of small magnitude are processed to extract synthetic Wood– Anderson traces. Assuming a general description of peak-displacement scaling with the distance, by means of linear and logarithmic contributions, a global exploration of the parameter space is performed by a grid-search method with the aim of investigating the correlation between the two decay contributions and seeking for a physical solution of the problem. Assuming an L2 norm, we found M log A 1:79 log R 0:58; yielding an error on the single estimation smaller than 0.2, at least when the hypocenter location is accurate. Station corrections are investigated through the station residuals, referring to the average value of the magnitude. Using a z test, we found that some stations exhibit a correction term significantly different from 0. The use of the peak acceleration and peak velocity as indicators of the magnitude is also investigated.
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