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Cattaneo et al., 2000

Cattaneo M., Augliera P., De Luca G., Gorini A., Govoni A., Marcucci S., Michelini A., Monachesi G., Spallarossa D., Trojani L., XGUMS, 2000. The 1997 Umbria-Marche (Italy) earthquake sequence: analysis of the data recorded by the local and temporary networks. Journal of Seismology 4, 4, 401-414. https://doi.org/10.1023/A:1026511209166

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Abstract

We present some preliminary results obtained from thejoined analysis of the data collected by the permanentand the temporary networks operating in the area ofthe earthquake sequence that followed (andanticipated) the 26 September, Central Italy, mainshocks. In particular, these earthquake data haveallowed us to determine a well constrainedwave-velocity model (both P and S) with stationcorrections which demonstrated to produce robusthypocentral locations. These velocity modelswith station corrections have been used forre-locating the whole September 1997–July 1998subset of data of the permanent network, and theprevious background seismicity, starting from May1996. The focal mechanisms of the largest events werealso obtained from an analysis of the first-motionpolarities.Our results indicate that 1) the seismic activityaligns on a SE-NW trend for a total length of about50 km of extension; 2) the focal depth of theseevents is restricted to the range 0–9 km; 3) mostevents can be related to sub-parallel SW dipping faultplanes; 4) focal mechanisms of the largest shocks(ML > 4) show a coherent behaviour, withnormal fault solution on SSE-NNW striking, SW dippingplanes; 5) the space-time evolution of the activitydisplays a discontinuous mode of energy release, withdifferent episodes of activation and an apparentclustering of aftershocks at the edges of the areaswhich presumably ruptured in the main shocks.

Nell'archivio c'è un terremoto da questo studio:In the archive there is one earthquake considered from this study:


   
molto grandiextra large
   
grandilarge
   
medimedium
   
piccolismall
   
molto piccolivery small
non parametrizzatinot determined
falsifake
 

Clicca sulla riga per individuare il terremoto sulla mappa o sulla lente per ottenere più informazioni.Click the row to highlight the earthquake on the map or the lens to obtain more information.

  DataDate    Area epicentraleEpicentral area    MDPs   Imax  EQ in
CPTI15
EQ in
CPTI15
Riferim. in
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reference
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