Strano evento in Nebraska

Giusto ieri sera avevo letto la segnalazione del convegno cunnetwork.freeforumzone.leonardo.it/discussione.aspx?c=163391&f=163391&idd... e questa mattina il sito spaceweather.com riporta la segnalazione di uno strano evento relazionato ad un sisma:

Earthquakes don't rock Nebraska very often. In fact, seismically speaking, it is one of the quietest places in North America. Nevertheless, on Dec. 16th at 8:54 pm CST, USGS seismographs detected a magnitude 3.5 temblor centered near Auburn, Nebraska:



"It sounded like those loud grain haulers that drive by, but about five times louder," reports Laurie Riley, who lives near the epicenter. "The whole house shook. My kids came running down stairs – they were scared. It even moved my car, [which was parked outside on icy ground]."

And then the really curious thing happened.

Minutes after the quake, around 9 pm CST, lightning-like flashes lit up the skies around the area of the quake. Telephones in police departments and TV stations rang with reports of bright lights, loud rumbles and shaking ground. Sky watchers, not only in southeastern Nebraska, but also in neighboring Oklahoma, Missouri and Kansas, saw a "bright fireball" with "green streamers" moving from northwest to southeast.

Could these events be connected? Nebraska State Trooper Jerry Chab, an experienced amateur astronomer who witnessed the lights and was one of the first to report them, says no. "I think we have the most cosmic of coincidences: A bright [meteoritic] fireball around the same time as an earthquake." Indeed, eyewitness descriptions of the fireball are consistent with a meteoroid disintegrating in the atmosphere. On the other hand, several readers have pointed out scientific studies that associate lightning-like phenomena (including ball lightning) with earthquakes: #1, #2, #3. The fireball, they suggest, might have been a rare manifestation of "earthquake lightning."

Altri dati qui: earthquake.usgs.gov/earthquakes/recenteqsww/Quakes/us2009qhaf.php...