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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6049

Authors: Bobbio, A.*
Vassallo, M.*
Festa, G.*
Title: A Local Magnitude Scale for Southern Italy
Title of journal: BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
Series/Report no.: 4/99(2009)
Publisher: SEISMOLOGICAL SOC AMER
Issue Date: 2009
DOI: 10.1785/0120080364
Keywords: Local Magnitude
Southern Italy
Abstract: A 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.
Appears in Collections:04.06.06. Surveys, measurements, and monitoring
04.06.03. Earthquake source and dynamics
Papers Published / Papers in press

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