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This is Scientific American 60-second science. I'm Julia Rosen. Got a minute?

99 years ago, a magnitude 7.3 earthquake hit Puerto Rico. It also caused a tsunami that swept

through coastal towns. All told, the shaking and flooding killed more than 100 people and damaged

many buildings and roads. Now, scientists are getting a clearer picture

of that tragic event, thanks to an unexpected source, century-old documents unearthed in an archive

in the capital city of San Juan. The documents were discovered by Bill McCann, a seismologist

and former professor at the University of Puerto Rico. McCann stumbled upon boxes of repair petitions filed by residents of what was then a newly acquired U.S. territory,

asking for aid after the disaster.

He later mentioned them to Roland LaForge, another semi-retired seismologist, who told me why he wanted to rescue the records.

You know, they're just sitting there getting moldy and nobody's ever looked at them.

And there might be some really useful information in there.

So the two researchers analyzed more than 6,000 documents, which turned out to be a gold mine

of information about the disaster and the damage it caused on a house-by-house basis.

They're very sad and pointed at times because lost family members, some people drowned

and they never found their bodies.

You know, you got a real feel for the suffering that these people went through.

In a newly published study based on the records, the researchers focused on the town of Aguadilla,

...