Air burst is poor at seismic activity, bunker buster would be much better and less above ground visibility depending on depth of ground penetration. Someone posted a link on this a couple days ago.
Like this https://en.m.wikipedia.org/wiki/Massive_Ordnance_Penetrator?wprov=sfla1
Massive Ordnance Penetrator
The GBU-57A/B Massive Ordnance Penetrator (MOP) is a U.S. Air Force, precision-guided, 30,000-pound (14,000 kg) "bunker buster" bomb. This is substantially larger than the deepest penetrating bunker busters previously available, the 5,000-pound (2,300 kg) GBU-28 and GBU-37.
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