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Bulletin of the Seismological Society of America; December 2001; v. 91; no. 6; p. 1694-1703; DOI: 10.1785/0120000058
© 2001 Seismological Society of America
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Article

Detection of Space and Time Heterogeneity in the Completeness of a Seismic Catalog by a Statistical Approach: An Application to the Italian Area

Dario Albarello, Romano Camassi and Alessandro Rebez

Department of Earth Sciences
University of Siena
Via Laterina 8
53100 Siena, Italy
albarello{at}unisi.it
(D.A.)

INGV DISTART Department
University of Bologna
Viale Risorgimento 2
40136 Bologna-1, Italy
romano.camassi{at}mail.ing.unibo.it
(R.C.)

Istituto Nazionale di Oceanografia e di Geofisica Sperimentale
Borgo Grotta Gigante 42c I-34010 Trieste, Italy
rebez{at}ogs.trieste.it
(A.R.)

A new statistical approach is proposed for the definition of the time interval characterized by a seismicity data set representative of the actual seismicity (completeness). The proposed approach does not require stringent assumptions about statistical features of local seismicity, nor does it require preprocessing procedures (e.g., aftershock removal), a potential source of statistical biases. In order to validate this procedure, the Italian seismic catalog NT4.1 has been studied, which is probably the one with the best historical background in the world, and for which it is possible to make hypotheses about data set completeness in the light of historiographical considerations. The results obtained indicate that the proposed statistical procedure is effective for a first order completeness estimate of parametric seismic catalogs.




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