That would have gone off like a string of firecrackers; what actually happened was one titanic explosion...
It’s called detonation. 60 tons is used a moderate 155mm artillery barrage. 120,000/100 = 1200 rounds. About 32 rounds apiece for a battalion of guns.
Set off a group of artillery shells with an impact and the over pressure from the initial shock wave is sufficient to ignite adjacent rounds (force=heat).
So, imo the shells were in strategic storage when they should have been in tactical storage. AKA “our stuff is within range of enemy fire” in which case they need to spread the rounds out in piles with barriers between them such as Hescos. Similar issue with nuclear fission. Spread the fuel out to avoid criticality.
No, it doesn’t. I often detonates so fast you cannot detect the chain effect. More than a few ammo dumps have been perfectly hit in wars. I actually saw one. And the dump of a hundred torpedoes on Roi-Namur went off in one blast.
P-47 hits an ammo train.
https://www.youtube.com/watch?v=StGjHULRyVA
Anyway, it wasn’t nuclear. If 150 pallets were not carefully dispersed, you can and will get a single blast that humans cannot detect as sympathetic detonation.