Forgotten archives reveal street-level impact of 1918 Puerto Rico earthquake and tsunami


Credit: Courtesy of Roland LaForge



The researchers combed through handwritten and often heartbreaking petitions for funds to repair homes battered or washed away by the tsunami, or damaged by earthquake ground shaking. Together, the data provide a "pretty accurate picture to find out where the damage was, and how far the tsunami made it inland," said LaForge.

At the south end of town, in particular, the tsunami's three to four meter- high mark could be determined from repair petitions from houses closely clustered together–where some homes reported wave damage and some were untouched by the waves.

The address-level findings are consistent with a 1919 reconnaissance of the earthquake damage and more modern calculations of tsunami wave heights, the researchers say. But the new study provides more detailed "ground truth" of what happened during the 1918 quake, said LaForge, and could be useful in predicting which parts of Aguadilla would be mostly likely to suffer damage during the next major earthquake.

In the United States, the Caribbean and Latin America, LaForge said, "finding and interpreting written historical earthquake damage accounts is difficult and time consuming, but we have learned that researching these old earthquakes has become more important over time".





"The layout of the town is pretty much the same as it was in 1918," LaForge explained. "And we had these detailed damage descriptions by neighborhood and street and address in some cases. We thought if we can match up these addresses with modern-day addresses to know where they were, we could get a pretty good picture of where the damage was and how severe it was."

The petitions marked other losses as well. "Reading through the actual reports was very poignant at times," LaForge said. "Some of these people lost family members, or knew people who drowned. You get a real idea of what people went through."

LaForge hopes that other researchers–students at the University of Puerto Rico, perhaps– will use the digitized petition data to learn more about the earthquake and tsunami impact in other towns such as Mayagüez. "The dataset in general is a real gold mine."



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