Revealing mistake: It's very clear they blew up a model of the buildings. The grass seen just before the explosions is way too long and is not as long when the characters are running away. Further, the truck and the barrels have disappeared at the explosion shot.

Tremors 2 (1996)
Ending / spoiler
Directed by: S.S. Wilson
Starring: Fred Ward, Michael Gross, Helen Shaver, Chris Gartin, Christopher Gartin
Burt locks all the shriekers in the garage. That also happens to hold tons of food. Earl covers himself in CO2 and goes in. He turns on a timed bomb and leaves. He tells Burt what he did and they run about 3/4 of a mile from the garage. There is a mass explosion destroying the town three times over again.
Steve
More mistakes in Tremors 2 More quotes from Tremors 2
Kate Reilly: Who named them graboids anyway?
Earl Bassett: A friend of ours, Walter Chang, he named them. Then they ate him.
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Answer: According to IMDb it was released directly to video. According to Tremors fan sites, SciFi channel currently doesn't plan to release the series on DVD.
Andreas[DK]