Are Chile鈥檚 building codes getting too much credit?
Many commentators have pointed to Chile鈥檚 stringent building codes as a key reason why the death toll from its earthquake (in the hundreds at this writing) has been so much lower than in Haiti (in the hundreds of thousands).
Unfortunately, much of this commentary confuses two separate concepts: building quality and building codes. Building quality clearly played a key role in minimizing death and damage from the earthquake. Indeed, Chilean buildings are well-known for incorporating earthquake resistance techniques such as the .
That doesn鈥檛 imply, however, that building codes deserve credit for the quality of the buildings. Indeed, I can think of three other factors that likely deserve some credit as well:
- Chile鈥檚 wealth. In 2009, per capita income in Chile was 聽higher than in Haiti. Even in the absence of any building codes, the relatively rich Chileans would not be living in buildings as fragile as those in Haiti.
- Chile鈥檚 history of earthquakes. In 1960, Chile suffered the 聽(9.5), killing several thousand people. Even in the absence of any building codes, memories of that quake would have encouraged Chileans to construct more earthquake-resistant buildings. In Haiti, in contrast, the last major earthquake was in 1842, before the memories of any living Haitians.
- Chile鈥檚 enforcement of building codes. Building codes are just pieces of paper (or their electronic equivalent). Governments can create all the codes they want, but if unscrupulous officials don鈥檛 enforce them鈥攐r get bribed to look the other way鈥攖hey can be next to useless. Chile ranked among the 20 least corrupt nations in the world in 2009; Haiti was among the 12 most corrupt.
My point is not that building codes had no effect. I bet they did. But that鈥檚 not the whole story when it comes to building quality. Chileans would have built better buildings than Haitians anyway. 聽And Chileans live in a society where building codes actually get enforced. For both those reasons, we shouldn鈥檛 overstate the importance of building codes alone in explaining Chile鈥檚 resilience and Haiti鈥檚 devastation. Nor should we leap to the conclusion that the way to deal with Haiti鈥檚 future earthquake threats is to import Chile鈥檚 building code.
My second point is a scientific one. In principle, Chile鈥檚 earthquake provides an opportunity for researchers to evaluate just how important building codes have been in protecting Chile鈥檚 buildings.聽Enterprising analysts should look for situations that allow us to identify the effect of building codes versus other factors. For example, much has been made of the building code revisions that Chile adopted in 1995. That suggests one empirical strategy: compare what happened to buildings that were constructed in 1994 to buildings that were constructed in 1996. Did the 1996 ones perform much better? That would suggest that the building codes really helped. Or did 1994 buildings do just as well as the 1996 ones? That would suggest that the codes had little effect, perhaps because they were just capturing practices that were already in use by Chilean builders.
For related discussions, see 聽and this . The comments on the second piece include an interesting discussion of the extent to which Chilean buildings would have been earthquake resistant in the absence of building codes. One commentator offers the extreme view that the building codes had no effect, while others offer the other extreme. I think the truth is in the middle.
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