The Lisbon Earthquake and the Destruction of a Capital

A Morning of Shaking, Fire and Water

On November 1, 1755, a powerful earthquake struck Lisbon and the surrounding region. It was All Saints' Day, when many people were in churches or preparing for observances. Buildings collapsed, fires spread and a tsunami reached the waterfront. The three hazards did not affect every district in the same way. Moving into an open area might reduce exposure to falling masonry, yet low ground near the water brought a different risk. The disaster cannot be read from a damage map as if the shaking alone had produced every ruin. People had to respond as the danger changed within the same morning.

A Large Event Without Modern Instruments

There were no modern seismographs to record the earthquake. Its size and source are reconstructed from reports of shaking, damage and tsunami effects. The waves reached places far beyond Lisbon, leaving evidence in records from other coastlines. Historical estimates of casualties vary because record keeping was incomplete and the event affected both the city and places beyond it. Numbers can help convey scale, but a single exact figure would hide the uncertainties of the available material. For researchers, knowing where a report was made and what kind of effect it describes can be more useful than a dramatic total of unknown origin.

The Questions Sent After the Disaster

The Portuguese government, with the future Marquis of Pombal directing much of the response, asked local authorities for accounts of the shaking and its effects. Questions concerned timing, duration, damage and other observations. The answers were not all alike in detail or reliability. Together they offered a way to compare how the event appeared across a wider area. The inquiry mattered because it turned experiences that might otherwise have remained local into material that could be examined side by side. Long before modern instruments, organized collection of testimony could give a disaster a geographic and physical description.

Rebuilding a Different Center

The lower city was rebuilt with a more regular street plan and buildings whose construction sought to reduce vulnerability to shaking. The changes reflected choices about property, circulation and the kind of capital officials wanted after the disaster. They could not simply reproduce the city as it had been. Lisbon also became the subject of arguments about providence, nature and the responsibilities of governments, but rebuilding required practical decisions regardless of what explanation a person preferred. November 1 marks an event that joined physical destruction to an unusually visible administrative response. Its record survives in streets as well as in written accounts. The rebuilt center makes the administrative response visible to a visitor who has never read the surveys or the original reconstruction plans.