Catastrophes · Séisme à São MiguelUn séisme de magnitude 4,6 ressenti dans toute l’île de São Miguel, sans dégâts signalésRédigé 29 octobre 2026 à 11:24 UTCRegarderTranscription0:07An offshore earthquake sent shaking across S.0:09Omiguel.0:10The strongest effects were in Guinez.0:12Portugal's earthquake agency says it has received no reports of injuries or material0:15damage so far.0:16Will later reports change that early assessment?0:19The earthquake struck on October29, around six fifty, four in the morning locally.0:23The reviewed estimate places it forty, one kilometers west of Mosteiros.0:27At a depth of ten kilometers, Mos Tairos belongs to Portugal's autonomous Azores0:31region.0:32Mosteiros is a coastal parish in the municipality of Ponta Delgada on S.0:36Omiguel.0:37The earthquake's offshore location puts this event beside Portugal's Atlantic0:40Islands, well away from the mainland.0:42People felt weaker shaking in Mostairos and in S.0:45O.0:45Sebastio, S.0:46O.0:46Just and S.0:46O.0:47Pedro in Ponta Delgada.0:48It also reached Matriz, Ribera Seca, and Riberinha in the municipality of Ribera0:53Grande.0:53Ginetis registered the strongest reported shaking at intensity three to four on the0:57modified Mercali scale.0:59Intensity describes the effects at a particular place.1:01Magnitude measures the earthquake itself, so those figures describe different1:05things.1:05Portugal's earthquake agency initially hadn't received confirmation that people had1:09felt the tremor.1:10Its later assessment confirmed shaking across these communities.1:13The agency also raised its initial magnitude estimate from four point six to four1:17point seven as more information came in.1:19The reviewed magnitude remains four point six on the body wave scale, which uses1:23seismic waves traveling through the Earth.1:25The Portuguese estimate is four point seven on the local magnitude scale.1:29That local revision leaves the separate body wave measurement unchanged.1:33The Portuguese calculation places the epicentry about forty kilometers west of1:36Genetas.1:37Its calculated starting time is one second later than the reviewed estimate.1:41Agencies can get slightly different results because they use different data,1:44algorithms, and models of how seismic waves travel.1:47A second earthquake followed five minutes later.1:49Its later local magnitude estimate was three point eight, with maximum intensity two1:53in most iros.1:55An earlier estimate had put that second tremor at four point zero.1:58The reviewed event record carries no pager alert, an earthquake impact alert field,2:02and its tsunami flag reads no.2:04Those fields alone can't tell us whether buildings suffered damage or serve as a2:08formal tsunami all.2:09Clear.2:09So far, the earthquake agency's assessment records felt shaking without reported2:13injuries or material damage.2:15That assessment can change as more information arrives.2:17The agency will issue further notices if developments warrant them.2:21It hasn't announced a scheduled update.Lire l’articleChronologie de l’histoireHeyDex
