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Un terremoto di magnitudo 3.9 sulla scala Richter si è verificato venerdi alle 9.27 nella regione del San Bernardino. L’epicentro, come scrive il sito del Servizio sismico svizzero, era situato nella Valle dell’Avers (Juf) 22 chilometri a sud di Thusis.
Il sisma, il piu forte nei Grigioni dal 2008, è stato avvertito chiaramente in un raggio di oltre un centinaio di chilometri dall’epicentro, oltre che nei Grigioni, in Ticino, Uri, Berna e Glarona. In Alta Mesolcina nelle abitazioni i lampadari hanno oscillato.
Il maggior terremoto nei Grigioni è quello di Churwalden del 1295 che ha raggiunto la magnitudo momento di 6.2 provocando vittime. Il calcolo è stato fatto sulla base di documenti storici.
Il più forte terremoto degli ultimi 100 anni in Svizzera si è verificato il 25 gennaio 1946 a Sierre (VS) Aveva una intensità di 5.8 della scala Richter: i morti furono quattro, duemila abitazioni furono lesionate.
RedMM/ats/mas
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