  Images of an explosion can be used to study some of its physical properties.
After reviewing the key aspects of the method originally developed to study the
first nuclear detonation and analyzing the Trinity blast data, the method is
applied to the Beirut explosion of August 2020 by using images from videos
posted online. The applicability of the method is discussed and the process of
selection, extraction, and analysis of the data is presented. The estimate for
the energy yield of the Beirut explosion is found to be $2.3^{+1.1}_{-1.1}$ TJ
or $0.6^{+0.3}_{-0.3}$ kt of TNT equivalent. The result is consistent with
others recently appeared in the literature using different methods. Notice that
this article includes content that some readers may find distressing.
