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Ground motion models for Molise region (Southern Italy)
Author(s)
Type
Conference paper
Language
English
Status
Unpublished
Issued date
September 2006
Conference Location
Geneva, Switzerland
Keywords
Abstract
On October 31st and November 1st, 2002 two moderate earthquakes of moment magnitude Mw=5.7 (INGV-Harvard European-Mediterranean Regional Centroid-Moment tensor project) occurred in southern Italy. After the mainshocks, felt in many municipalities of the Molise and Puglia region, a strong motion and a seismic temporary network were installed in the epicentral area and surrounding regions. The strong motion network was composed by 9 stations, integrating the accelerometers of the permanent Rete Accelerometrica Nazionale (RAN network), and operated until December 2003. The strong motion data set is composed by 195 recordings from 51 earthquakes (2.5<Ml<5.4) recorded by 29 accelerometers (Dipartimento della Protezione Civile et al., 2004). In addition to the strong motion network, several Italian research institutions (Istituto Nazionale di Geofisica e Vulcanologia, INGV; Istituto Nazionale di Oceanografia e Geofisica, INOGS; Dipartimento per lo studio del Territorio e delle sue Risorse, University of Genoa, Dip.Te.Ris) installed a temporary regional network, composed by 35 seismic stations. This network aimed at monitoring and studying the evolution in time and space of the seismic sequence. More than 1900 aftershocks were recorded in the period November 1st - December 5th, 2002 (Chiarabba et al., 2005).
The unified velocity-acceleration data set has been considered to derive ground motion models for peak ground acceleration and peak ground velocity for both maximum horizontal and vertical components. The results obtained for the Molise area have been compared with the attenuation pattern of the Umbria-Marche region (central Italy), that was recently investigated by Bindi et al. (2006). The remarkable differences observed indicate the need of a regional attenuation relation for the area and the need of further investigations, to better identify the role of source characteristics, anelastic and geometric attenuation and site effects in the evaluation of peak ground motion values.
The unified velocity-acceleration data set has been considered to derive ground motion models for peak ground acceleration and peak ground velocity for both maximum horizontal and vertical components. The results obtained for the Molise area have been compared with the attenuation pattern of the Umbria-Marche region (central Italy), that was recently investigated by Bindi et al. (2006). The remarkable differences observed indicate the need of a regional attenuation relation for the area and the need of further investigations, to better identify the role of source characteristics, anelastic and geometric attenuation and site effects in the evaluation of peak ground motion values.
References
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Bakun W. H., Joyner W. B. (1984), The Ml scale in central California, Bull. Seism. Soc. Am., n° 74, 1827–1843.
Bindi D., Luzi L., Pacor F., Franceschina G., Castro R. R. (2006). Ground motion predictions from empirical attenuation relationships versus recorded data: the case of the 1997-98 Umbria-Marche (Central Italy) strong motion data-set, Bull Seism. Soc. Am., in press.
Chiarabba C., DeGori P., Chiaraluce L., Bordoni P., Cattaneo M., Demartin C., Frepoli A., Michelini A., Monachesi G., Moretti M., Augliera P., D'Alema E., Frapiccini M., Gassi A., Marzorati S., Molise Working Group (INOGS, Dipteris Unige). Mainshocks and aftershocks of the 2002 Molise seismic sequence, southern Italy, J. Seismol., n° 9, 487-494.
Dipartimento della Protezione Civile - Ufficio Servizio Sismico Nazionale - Servizio Sistemi di Monitoraggio (2004). The Strong Motion Records of Molise Sequence (October 2002 - December 2003), CD-ROM, Rome.
Paige, C. C., Saunders M.A. (1982). An algorithm for sparse linear equations and sparse least squares, ACM Trans. Math. Software, n° 8, 43-71.
Sabetta F. and A. Pugliese (1996). Estimation of response spectra and simulation of non-stationary earthquake ground motion, Bull. Seism. Soc. Am., n° 86, 337-352.
Spudich P., Joyner W.B., Lindh, A.G., Boore D.M., Margaris B.M., Fletcher J.B. (1999). SEA99: a revised ground motion prediction relation for use in extensional tectonic regimes. Bull. Soc. Seism. Am., n° 89, 1156-1170.
Bakun W. H., Joyner W. B. (1984), The Ml scale in central California, Bull. Seism. Soc. Am., n° 74, 1827–1843.
Bindi D., Luzi L., Pacor F., Franceschina G., Castro R. R. (2006). Ground motion predictions from empirical attenuation relationships versus recorded data: the case of the 1997-98 Umbria-Marche (Central Italy) strong motion data-set, Bull Seism. Soc. Am., in press.
Chiarabba C., DeGori P., Chiaraluce L., Bordoni P., Cattaneo M., Demartin C., Frepoli A., Michelini A., Monachesi G., Moretti M., Augliera P., D'Alema E., Frapiccini M., Gassi A., Marzorati S., Molise Working Group (INOGS, Dipteris Unige). Mainshocks and aftershocks of the 2002 Molise seismic sequence, southern Italy, J. Seismol., n° 9, 487-494.
Dipartimento della Protezione Civile - Ufficio Servizio Sismico Nazionale - Servizio Sistemi di Monitoraggio (2004). The Strong Motion Records of Molise Sequence (October 2002 - December 2003), CD-ROM, Rome.
Paige, C. C., Saunders M.A. (1982). An algorithm for sparse linear equations and sparse least squares, ACM Trans. Math. Software, n° 8, 43-71.
Sabetta F. and A. Pugliese (1996). Estimation of response spectra and simulation of non-stationary earthquake ground motion, Bull. Seism. Soc. Am., n° 86, 337-352.
Spudich P., Joyner W.B., Lindh, A.G., Boore D.M., Margaris B.M., Fletcher J.B. (1999). SEA99: a revised ground motion prediction relation for use in extensional tectonic regimes. Bull. Soc. Seism. Am., n° 89, 1156-1170.
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