placemakers frame and truss in harewood were building relocatable accommodation , im not sure if they still are but they were pumping them out pretty fast.
even though it was aq 6.3 and the 7.1 we had did less damge the magnitude of the quake dosent effect that too much there is a measurement called peak ground accelartion
from wiki "Peak ground acceleration (PGA) is a measure of earthquake acceleration on the ground and an important input parameter for earthquake engineering. Unlike the Richter and moment magnitude scales, it is not a measure of the total energy (magnitude, or size) of an earthquake, but rather of how hard the earth shakes in a given geographic area (the intensity). The Mercalli intensity scale uses personal reports and observations to measure earthquake intensity but PGA is measured by instruments, such as accelerographs, and it generally correlates well with the Mercalli scale.[1]
The peak horizontal acceleration (PHA) is the most commonly used type of ground acceleration in engineering applications, and is used to set building codes and design hazard risks. In an earthquake, damage to buildings and infrastructure is related more closely to ground motion, rather than the magnitude of the earthquake. For moderate earthquakes, PGA is the best determinate of damage; in severe earthquakes, damage is more often correlated with peak ground velocity.[1]"
http://en.wikipedia.org/wiki/Peak_ground_acceleration
we had a measurement of 1.8 - 2.2 depending on the area bare in mind 0.5 would topple most major cities around the world