Il collasso dell’AMOC diventa un rischio reale Quando un governo considera una corrente oceanica un problema di sicurezza nazionale, significa che qualcosa è cambiato davvero. L’Islanda ha ufficialmente classificato il possibile collasso dell’AMOC — la grande circolazione che porta calore dall’Atlantico ai mari del Nord — come minaccia esistenziale. Una decisione rara. E un segnale forte per l’Europa. Perché l’AMOC è così importante L’AMOC funziona come un gigantesco nastro trasportatore: acqua calda dai tropici sale verso nord, si raffredda, affonda e torna indietro in profondità. È questo flusso a rendere gli inverni europei sorprendentemente miti per la latitudine. Il problema è la velocità del cambiamento. L’acqua dolce proveniente dallo scioglimento della Groenlandia sta “diluendo” l’Atlantico del Nord, disturbando il meccanismo che permette all’acqua salata di affondare. Se l’affondamento rallenta, l’intero circuito si indebolisce. Se si ferma, collassa. Gli scienzia...
SAN DIEGO -- A loud boom and shaking was reported around 8:45 a.m. Friday and was heard and felt all by 10News viewers from all around San Diego County. Sallene Leang was working at a Seaport Village store when she felt the shaking. “What I heard this morning … just the doors rattling; I didn't know what it was. I didn't think it was an earthquake because the ground wasn't shaking,” said Leang. The U.S. Geological Survey confirmed the shaking was not an earthquake. A representative from MCAS Miramar said they did not know what caused the booming sound. Midway-area resident Carol Hill told 10News she thought the loud sound was her neighbor banging on her windows. “All at once there was a knocking noise and a rumbling vibration on my kitchen window,” Hill said. One person said: “We felt it in Coronado but it did not feel like an earthquake. We thought it felt like an explosion or something.” Another Facebook fan said: “I live by Gillespie Field … I thought it was a jet taking off.” The National Weather Service has ruled out that the noise was caused by anything weather-related.
Mystery deepens: Earlier today, local news erroneously reported that there wasn’t an earthquake at the time. But USGS does confirm to news that a neighboring earthquake did strike around that time. But the quake wasn’t substantial. And it wasn’t precisely in San Diego either. A 1.4 magnitude quake struck Friday April 13, 2012, USGS reports to news, at roughly 8:18 AM PST. The quake was ninety-three miles from San Diego. The quake was north east of town, located closest to Indio, USGS tells news. The only other quake around that time was a 1.9 magnitude quake. But that quake was centered out near Seeley. -
