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dc.contributor.authorallSolarino, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italiaen
dc.description.abstractMany seismological observatories began to record and store seismic events in the early years of the twentieth century, contributing to the compilation of very valued databases of both phase pickings and waveforms. However, despite the availability of the instrumental data for some of the events of the last century, an instrumental location for these earthquakes is not always computed; moreover, when available, the macroseismic location is strongly preferred even if the number of points that have been used for it is low or the spatial distribution of the observations is not optimal or homogeneous. In this work I show how I computed an instrumental location for 19 events which occurred in the Garfagnana-Lunigiana region (Northern Tuscany, Italy) beginning from 1902. The location routine is based on a Joint Hypocentral Determination in which, starting from a group of master events, the systematic errors that may affect the data are summed up in the corrective factors complementing the velocity propagation model. All non-systematic errors are carefully checked and possibly discarded by going back to the original data, if necessary. The location is then performed using the classic approach of the inverse problem and solved iteratively. The obtained locations are then compared to those already available from other macroseismic studies with the aim to check the role to be attributed to the instrumental locations. The study shows that in most cases the locations match, in particular when considering the different significance of the location parameters, especially for the strongest events: the instrumental location provides the point where the rupture begins, while the macroseismic one is an estimate of the area where the earthquake possibly took place. This paper is not meant to discuss the importance and the necessity of macroseismic data; instead, the aim is to show that instrumental data can be used to obtain locations even for older seismic events, without any intention to define which location is better or more reliable.en
dc.format.extent767562 bytesen
dc.relation.ispartofAnnals of Geophysicsen
dc.relation.ispartofseries6/48 (2005)en
dc.subjecthistorical seismicityen
dc.subjectvelocity propagation modelen
dc.subjectJoint Hypocentral Determinationen
dc.titleThe role of instrumental versus macroseismic locations for earthquakes of the last century: a discussion based on the seismicity of the North-Western Apennines (Italy)en
dc.subject.INGV04. Solid Earth::04.06. Seismology::04.06.05. Historical seismologyen
dc.subject.INGV05. General::05.09. Miscellaneous::05.09.99. General or miscellaneousen
dc.relation.referencesBOSCHI, E., E. GUIDOBONI, G. FERRARI, D. MARIOTTI, G. VALENSISE and P. GASPERINI (Editors) (2000): Catalogue of strong italian earthquakes from 461 B.C. to 1997, Ann. Geofis., 43 (4), pp. 268 (with CD-ROM). CAMASSI R. and M. STUCCHI (1997): NT4.1.1 a Parametric Catalogue of Damaging Earthquakes in the Italian Area (GNDT, CNR), pp. 66. ELLSWORTH, W.L. (1977): Three dimensional structure of the crust and mantle beneath the island of Hawaii, Ph.D. Thesis (Massachusetts Institute of Technology), pp. 327. GASPERINI, P. and G. FERRARI (2000): Deriving numerical estimates from descriptive information: the computation of earthquake parameters, Ann. Geofis., 43.(4), 729-746. FERRARI, G. and N.A. PINO (2004): EUROSISMOS 2002-2004 a project for saving and studying historical seismograms in the Euro-Mediterranean area, in XXIX General Assembly of the European Seismological Commission, Abstracts, p. 74. GRUPPO DI LAVORO CPTI (1999): Catalogo Parametrico dei Terremoti Italiani (ING,GNDT, SGA, SSN), (Ed. Compositori, Bologna), pp. 92. GRUPPO DI LAVORO CPTI (2004): Catalogo Parametrico dei Terremoti Italiani, Versione 2004 (CPTI04), (INGV, Bologna), (on line: KISSLING, E. (1988): Geotomography with local earthquake data, Rev. Geophys., 26, 659-698. KISSLING, E., S. SOLARINO and M. CATTANEO (1995): Improved seismic velocity reference model from local earthquake data in Northwestern Italy, Terra Nova, 7, 528-534. MICHELINI, A. and the INGV SISMOS GROUP (2004): Current developments in the INGV SISMOS project, in XXIX General Assembly of the European Seismological Commission, Abstracts, p. 76. MONACHESI, G. and M. STUCCHI (1997): DOM4.1, an Intensity Database of Damaging Earthquakes in the Italian Area (Web update 2000, on line: http://emidius.mi.ingv. it/DOM/). POSTPISCHL, D. (1985): Catalogo dei terremoti Italiani dall’anno 1000 all’anno 1980, Quad. Ric. Sci., 114 (2B), pp. 239. SOLARINO, S. (2002): The September 7, 1920 earthquake in Lunigiana-Garfagnana (Tuscany, Italy): can instrumental data provide a reliable location?, in Proceedings of the XXVIII General Assembly of ESC (CD-ROM). SOLARINO, S., D.P. HILL and W.L. ELLSWORTH (1996): Eastern California seismicity beginning from 1927 and its relation to the post-1980 unrest in Long Valley Caldera, California, in Agu Fall Meeting, Book of abstracts, p. 206. SOLARINO, S., G. FERRETTI and C. EVA (2002): New insights on the seismicity of the Lunigiana-Garfagnana area (Tuscany, Italy), J. Seismol., 6, 141-152. VALENSISE, G. and D. PANTOSTI (2001): Database of potential sources for earthquakes larger than M 5.5 in Italy, Ann. Geofis., 44 (suppl. to no. 4), pp.180 (with CDROM).en
dc.description.journalTypeJCR Journalen
dc.contributor.authorSolarino, S.en
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italiaen
item.fulltextWith Fulltext-
crisitem.classification.parent04. Solid Earth-
crisitem.classification.parent05. General- Nazionale di Geofisica e Vulcanologia (INGV), Sezione ONT, Roma, Italia- Nazionale di Geofisica e Vulcanologia-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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