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The evolution of the fireball resulting from the August 2020 Beirut explosionis traced using amateur footage taken during the first $\sim$ 230 $ms$ afterthe detonation. 38 frames separated by $\sim$ 16.66 - 33.33 $ms$ are extractedfrom 6 different videos located precisely on the map. Measurements of the timeevolution of the radius $R_{t}$ of the shock wave are traced by the fireball atconsecutive time sequence $t$. Pixel scales for the videos are calibrated byde-projecting the existing grains silos building for which accurate drawingsare available and by defining the line of sight incident angles. The energyavailable to drive the shock wave at early times can be calculated through $E =10^{2b} K \rho_{o}$ where $b$ is a fitted parameter dependant on the relationbetween $R_t$ and $t$. $K$ is a constant depending on the ratio of specificheats of the atmosphere and $\rho_0$ is the undisturbed gas density. A totalenergy yield of $E \approx 1.3\times 10^{12}$ Joules with a lower bound of$9.8\times 10^{11}$ and an upper bound of $\sim 1.7\times 10^{12}$ or theequivalent of $\sim 310_{235}^{405}$ tons of T.N.T. is found. Our energy yieldsare different from other published studies using the same method. This canpresent an argument that if the compound that exploded is fuel rich ammoniumnitrate (ANFO), then the actual mass that detonated is less than officiallyclaimed.

Beirut explosion: Energy yield from the fireball time evolution in the first 230 milliseconds