How big were the explosions?The Chi

How big were the explosions?
The China Earthquake Networks Centre said the initial explosion, in a city with a population of around 15 million, had a power equivalent to three tonnes of TNT detonating, while the second was the equivalent of 21 tonnes.
The second was so big that satellites orbiting Earth picked it up as well. Chinese data site Cnbeta published pictures showing the sudden flare