www.barrons.com/…
The Italian Air Force told Giani it had nothing to do with the sonic boom.
"The type of event which caused the tremor, felt by many as an earthquake over the entire coast of Tuscany and in some inland areas, is currently unconfirmed," Giani wrote on social media.
The region's Geophysics Institute and the University of Florence said in a joint statement that whatever caused the boom was travelling at 400 miles per second.
www.express.co.uk/…
A mysterious seismic "sonic boom" explosion that could be heard for 60 miles across the Mediterranean is thought to have been caused by an out-of-this-world reason.
Residents on the Italian island of Elba off the coast of Tuscany and locals 100km away on the French island of Corsica both reported the huge 'acoustic and seismic' event around 2.30pm on Thursday.