"The explosion which had the near force of a volcanic eruption was so loud that it was able to throw concrete, dust and human excrement (faeces) into the air, while residents ran for dear life from the force of the methane gas. The Pig Farm public latrine is one of a cluster of four toilets in the area. Six men were attending to nature’s call in the facility when it blasted. Eye witnesses say the blast caused the emission of strong fumes into the air."The above description is instructive in that it englightens us on the cross-country variations of this kind of event. While the noise and force of the explosion are common elements to be found in both the Ghana and Glorietta deflagrations, there are also marked differences in terms of the composition of the blast debris and the fumes emitted.
What accounts for the relative lack of fecal matter found in the Glorietta incident compared to the Ghana-type event? I believe that the determining factor is cultural. While Ghanians presumably have a more up-front disposition as demonstrated by the relatively wide dispersal of their excrement, the typical Filipino with his well-known sense of "hiya" is more discreet. The resulting payload then embodies the character of its owners which explains why, in the course of the explosion, it chose to keep a low profile and stay in the basement lest it suffer undue embarrasment from public exposure.
Another obvious difference is in the nature of the fumes unleashed. Instead of the usual pozo negro smell that one would expect from a methane cloud, the Filipino shit bomb was characterized more by the smell of gunpowder. This can, of course, be attributed to hygienic practices, particularly the Filipino's penchant for regular brushing of teeth after every meal coupled with frequent washing of hair. As is well known, toothpaste and shampoo contain RDX, and the resulting build up of this explosive substance in the human body inevitably gets expelled into the sewage system. Seen in this light, the gunpowder smell can be easily accounted for.
For a more informative take on this topic, visit the opposing conjectures of Tounge-In-Anew who, for reasons of his own, still favors the bomb hypothesis, and DJB who prefers the apt-sounding deflagration hypothesis. Since these theories are mutually exclusive, it is safe to say that one will turn out to be full of shit.