GNGTS 2013 - Atti del 32° Convegno Nazionale

correspondence of 0.2 mm and close to 2080, i.e. the value determined by Uhrhammer and Collins (1990). For amplitude values in the range 0.05-0.07 mm the GS value is close to the original 2800 value proposed by Anderson and Wood (1925). Our MAW values have been compared with the recent ML estimates provided by INGV and a good agreement has been obtained. Moreover, a comparison with the MD values provided by OGS for its regional network, that was originally calibrated on the TRI MAW , has shown an overestimation in agreement with previous a work (Gentili et al. , 2011), which reaches values up to 30% for magnitude less than 4. Acknowledgements. All WA recordings are available at OGS. All the other magnitude and locations data used in this paper came from published sources listed in the references. Fig. 1a was made using the Generic Mapping Tools version 4.5.7 (www.soest.hawaii.edu/gmt ; Wessel and Smith, 1998). References Anderson J.A. and Wood H.O.; 1925: Description and Theory of the Torsion Seismometer . Bull. Seism. Soc. Am., pp. 15 1-72. Bragato, P.L. and Tento, A.; 2005: Local magnitude in northeastern Italy . Bull. Seism. Soc. Am. 95, 579-591. Castellaro S., Mulargia F. and Kagan Y. Y.; 2006: Regression problems for magnitudes . Geophys. J. Int. 165 , pp. 913-930. EMSC/CSEM - European-Mediterranean Seismological Centre website: http://www.emsc-csem.org/ Finetti I. and Morelli C.; 1972: Earthquake magnitude determination for Trieste WWSS station . Boll. Geof. Teor. Appl. 14 , pp. 67-83. Garbin, M.; 2009: Predisposizione, riordino e archiviazione delle elaborazioni dati sismometrici relativi alle stazioni temporanee delle reti Ravedis e Firb . Internal Report, 2009/64 CRS 6 APSES 94 pp. Gasperini P.; 2002: Local magnitude revaluation for recent Italian earthquakes (1981-1996) . Journal of Seismology, 6 , pp. 503-524. Gentile G. F.; 2002: Digitalizzazione dei sismometro Lhener-Griffith TS-220 (Wood-Anderson) . Rel. n. /47/2002/OGA-18, 39 pp. Gentili S., Sugan M., Peruzza L. and Schorlemmer D.; 2011: Probabilistic completeness assessment of the past 30 years of seismic monitoring in Northeastern Italy. Phys. Earth planet. Inter. 186, pp. 81-96. ISIDe Working Group; 2010: Italian Seismological Instrumental and parametric database. <http://iside.rm.ingv.it> Italian Seismic Bulletin (INGV, 2010) website: http://legacy.ingv.it/roma/reti/rms/bollettino/ OGS official bulletin website: http://www.crs.inogs.it/bollettino/RSFVG/RSFVG.en.html Richter C.F.; 1958: Elementary Seismology . W. H. Freeman and Company, San Francisco, 768 pp. Richter C. F.; 1935: An instrumental earthquake magnitude scale . Bull. Seism. Soc. Am., 25 , pp. 1-32 Uhrhammer R.A. and Collins E.R.; 1990: Synthesis of Wood-Anderson seismograms from broadband digital records. Bull. Seism. Soc. Am., 80 pp. 702-716. Uhrhammer R.A., Loper S.J. and Romanowicz B.; 1996: Determination of Local Magnitude Using BDSN Broadband Records. Bull. Seism. Soc. Am., 86 pp. 1314-1330. Uhrhammer R.A., Hellweg M., Hutton K., Lombard P., Walters A.W., Hauksson E. and Oppenheimer D.; 2011: California Integrated Seismic Network (CISN) Local Magnitude Determination in California and Vicinity . Bull. Seism. Soc. Am., 101 , pp. 2685-2693. 123 GNGTS 2013 S essione 1.1