The sources I read, if correct, point to the problem that this material will not simply explode if exposed to heat, say from fire or elevated temperature. That it needs proper fuses. The contrary argument was that gases would be given off, by high sustained temperature and a fuel being present , that will then explode by simple fire ? ( The photo shows no fuel present). Also conflicting reports about workmen doing welding work in the building versus small explosions seen emanating from windows of warehouse. Plus video of projectile posted earlier here. If not photoshoped. Ownership of material, varies from a Saudi and Hariri effort to arm Syrian rebels, to ship confiscated on route from Moldavia to Africa. Report of port authority complaint to courts to remove, were stopped. Russia will remove debris. ( Good, will reveal if radiation present).
Therefore so far, irrespective of origin of material, and not thinking about explosion caused by welding or air attack or bomb for now . Then if store House had windows, then unlikely that firework caused explosion? Could only cause small fires, short term, around bodies of fireworks, with paper and plastic as fuel ?
Compare with IRA bomb of Ammonium Nitrate and fuel oil. White smoke.
Therefore the explosion was not caused by Ammonium Nitrate. Nor an explosive chemical device. Either planted internal or external. The Ammonium decomposed into Red NO2 gas at high temperature. As KVS said. A MOAB is way too small to introduce enough fuel to initiate size of explosion, and would produce white smoke . This explosion is in low kiloton range. I THINK it is mini- Nuke. Delivered by drone. As witnesses said. Since delivery by hand not reliable. Hezb should quickly provide sample to Iran, urgently. Now they take open credit. More brazen. More humiliating.
Also according to USGS :
No. Even huge amounts of explosive almost never cause even small earthquakes, and it would take hundreds and thousands of small earthquakes to equal a large one, even if it could be done. In addition, we wouldn't have any control over the size of the earthquake being created if it worked, since small and large earthquakes all start out in exactly...
BUT, this explosion registered 3.3 on Richter scale !
This yontap North Korea Nuke explosion on 25 may 2009, was 5 kiloton. With 4.5 on the Richter scale. So this Lebanon blast at 3.3 Richter is about 3/4 of 5 kiloton. Or at least 1-3 kiloton. Similar to W25. Adapted for ground attack.