[@Absolis]
The problem is that vibranium's strength is variable. Captain America's shield has taken damage from blows from Mjolnir and held, and Mjolnir has enough force to crush moons. That's like a hundred nukes to the face. And yet this island was blown up with relatively standard explosives. So maybe it's because cap's shield is a vibranium titanium alloy, but it seems the strength of vibranium is as inconsistent as Superman's strength.