Ruby Tower Disaster
From WikiPilipinas: The Hip 'n Free Philippine Encyclopedia
One of the Philippines' deadliest earthquake disasters toppled the Ruby Tower building located in Binondo, Manila. The earthquake occurred on August 2, 1968, measuring 7.3 magnitude in the Richter scale.
Several buildings were damaged by this strong earthquake but none suffered complete destruction as had the Ruby Tower, a condominium in Binondo mostly populated by Chinese-mestizos.
More than 270 died in the collapse of the Ruby Tower, and more than 261 were injured. The epicenter was located in Casiguran, Quezon (now part of Aurora province), although it was Manila that was severely hit.
This was the most destructive earthquake in the Philippines during the 20 years before the 1990 Luzon earthquake. In addition, the earthquake generated a tsunami that reached as far as Japan.
There was an allegation that the Ruby Tower was poorly built and the materials were of low-quality.