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Moment tensor resolution; case study of the Irpinia seismic network, southern Italy

Maddalena Michele, Susana Custodio and Antonio Emolo
Moment tensor resolution; case study of the Irpinia seismic network, southern Italy
Bulletin of the Seismological Society of America (June 2014) 104 (3): 1348-1357

Abstract

We present an analysis of the reliability of focal mechanisms obtained through moment tensor inversion at the Irpinia Seismic Network, southern Italy. Our analysis is based on the methods proposed by Zahradnik and Custodio (2012) and Sokos and Zahradnik (2013). We present two different studies: (1) we compute maps of theoretical focal mechanism resolution for the Irpinia region and (2) we study the reliability of the solutions obtained from waveform inversion of five regional earthquakes. Theoretically, we find that when data error is the dominant source of error, focal mechanism resolution is better close to the spots of higher station density rather than at the center of the network. Using real data, we were able to successfully study four of the five regional events, in spite of the large source-station distances (up to approximately 280 km) and significant azimuthal gaps (>319 degrees ). We used variance reduction, double-couple percentage, signal-to-noise ratio, condition number, and focal mechanism variability index to assess the quality of the solutions. Our quality assessment is validated by comparison with independent focal mechanism solutions.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 104
Serial Issue: 3
Title: Moment tensor resolution; case study of the Irpinia seismic network, southern Italy
Affiliation: Universita degli Studi di Bari "Aldo Moro", Dipartimento di Scienze della Terra e Geoambientali, Bari, Italy
Pages: 1348-1357
Published: 201406
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 37
Accession Number: 2014-051937
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N40°30'00" - N41°30'00", E14°00'00" - E16°00'00"
Secondary Affiliation: Universidade de Lisboa, PRT, PortugalUniversita Frederico II di Napoli, ITA, Italy
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201428
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