With a little ingenuity, General Dynamics - Ordnance Shop ...
... could whip these jobbies into appropriate lengths, make the narrow ends all pointy and stuff, fill with the latest blend of Super-High-Tech "Tannerite", or the highly Secret/Codeword mix of same, add a fuse, and drop them anywhere we might need an earth-quake to happen! Could also make a useable, viscous mud out of all of our buried oil-shale deposits. Hafta fly at about 80,000 feet to get up to the optimal ground-entry speed, at drop-zone, tho. Salt-domes are stubborn geologic formations. Dao.