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- W643553732 abstract "Many 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, despitethe availability of the instrumental data for some of the events of the last century, an instrumental location forthese earthquakes is not always computed; moreover, when available, the macroseismic location is strongly preferredeven if the number of points that have been used for it is low or the spatial distribution of the observations isnot optimal or homogeneous. In this work I show how I computed an instrumental location for 19 events which occurredin the Garfagnana-Lunigiana region (Northern Tuscany, Italy) beginning from 1902. The location routine isbased on a Joint Hypocentral Determination in which, starting from a group of master events, the systematic errorsthat may affect the data are summed up in the corrective factors complementing the velocity propagation model. Allnon-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 obtainedlocations are then compared to those already available from other macroseismic studies with the aim to checkthe role to be attributed to the instrumental locations. The study shows that in most cases the locations match, in particularwhen considering the different significance of the location parameters, especially for the strongest events: theinstrumental location provides the point where the rupture begins, while the macroseismic one is an estimate of thearea where the earthquake possibly took place. This paper is not meant to discuss the importance and the necessityof macroseismic data; instead, the aim is to show that instrumental data can be used to obtain locations even for olderseismic events, without any intention to define which location is better or more reliable." @default.
- W643553732 created "2016-06-24" @default.
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- W643553732 date "2009-12-18" @default.
- W643553732 modified "2023-09-30" @default.
- W643553732 title "The role of instrumental versus macroseismic locations for earthquakes of the last century: a discussion based on the seismicity of the North-Western Apennines (Italy)" @default.
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- W643553732 doi "https://doi.org/10.4401/ag-3243" @default.
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