1755 Lisbon earthquake

A big shake hit the city of Lisbon.

The ground shook for many minutes. This caused many buildings to fall down.

Then, the sea moved in a big way.

Huge waves rushed into the city. These waves were called a tsunami.

Fires also started in the streets. Candles fell over and lit the flames. The fires burned for a long time.

Many people and buildings were lost. It was a very sad time for the land.

Scientists studied this to learn more. Now we know how to build better.

On the morning of November 1, 1755, a huge earthquake hit Lisbon.

The ground shook for three to six minutes. This event was very powerful. Experts say it had a magnitude of 7.7 or more. This is a way to measure how strong a shake is. The earthquake caused many buildings to fall. It also caused deep cracks in the city.

After the shaking, a tsunami arrived. A tsunami is a series of giant ocean waves. The sea first pulled back from the shore. Then, huge waves rushed into the harbor.

These waves hit the city and many coastal towns.

Fires also broke out across Lisbon. Candles fell over in homes and churches. This started a firestorm that burned for many hours. The earthquake, the waves, and the fires destroyed most of the city. Many people died, and many books and art were lost.

Leaders worked hard to fix the damage. They chose to build a new city with wider streets. They even made special wooden parts to help buildings stay up during shakes.

This helped start the study of how earthquakes work.

On the morning of November 1, 1755, a massive event changed the world. This was the Great Lisbon earthquake. It hit the Iberian Peninsula and Northwest Africa at about 09:40 local time.

The shaking lasted between three and a half to six minutes. Experts believe the earthquake had a magnitude of 7.7 or greater. This event was the third large earthquake to hit Lisbon in history. It caused deep cracks to open in the city center.

Three big things happened one after another to destroy the city. First, the ground shook violently for several minutes. Second, a tsunami arrived about 40 minutes later. People watching the docks saw the sea recede first. This revealed a plain of mud filled with shipwrecks and cargo. Then, huge waves rushed up the Tagus river and engulfed the harbor.

Third, giant fires broke out across the city. Candles in homes and churches fell over during the shaking. These started a firestorm that burned for many hours.

History shows how much was lost during this time. The earthquake and fires destroyed about 85 percent of Lisbon's buildings. The Royal Ribeira Palace was lost to the waves and fire. This included a library with 70,000 volumes and many famous paintings. Many people died in the disaster. Estimates say 30,000 to 40,000 people died in Lisbon. Another 10,000 people may have died in Morocco. The damage also reached as far as Spain and the Azores.

Leaders worked quickly to help the survivors. King Joseph I and the Marquis of Pombal survived the event. Pombal helped organize relief efforts to heal the living. They sent firefighters to stop the flames. They also worked to remove many bodies to stop disease. To keep order, the army was sent into the city. The king and Pombal decided to rebuild Lisbon in a new way. They chose to clear the old area and lay out new, wide streets.

This disaster actually helped us understand the Earth better. It was the first earthquake studied scientifically for its effects. This led to the birth of modern seismology, which is the study of earthquakes.

Engineers even created the "gaiola pombalina." This was a special wooden structure used to help buildings stay up during shakes. Today, we still look at the ruins of the Carmo Convent. These ruins remind people of how the world can change in a single morning.

The 1755 Lisbon earthquake was a massive natural disaster. It struck the Iberian Peninsula and Northwest Africa on November 1, 1755. This date was the Feast of All Saints. The event occurred around 09:40 local time.

Seismologists estimate the earthquake had a magnitude of 7.7 or greater. This was the third major earthquake to hit Lisbon in history. It remains one of the most significant geological events in European history. The disaster changed how people understood the world and how they rebuilt cities.

The disaster happened through a sequence of three devastating events. First, the ground shook violently for three and a half to six minutes. This shaking created wide fissures in the city center. Second, a tsunami arrived about 40 minutes after the shaking stopped. Survivors at the docks saw the sea recede first. This revealed a plain of mud filled with shipwrecks and lost cargo. Then, huge waves rushed up the Tagus river to engulf the harbor.

Third, a massive firestorm broke out across the city. Candles lit for All Saints' Day in homes and churches were knocked over. These started fires that burned for many hours. The firestorm even caused people to die from asphyxiation.

The destruction was widespread across many different regions. In Portugal, the Algarve region suffered heavy damage. Most coastal towns were ruined, though Faro was protected by the sandy banks of Ria Formosa. In Lagos, waves reached the top of the city walls.

The earthquake also affected inland areas like Covilhã and Setúbal. Even the island of Madeira and the Azores archipelago suffered significant damage. The effects reached North Africa, hitting places like Ceuta and Mazagon. In Spain, the tsunami damaged the city of Cadiz. The shocks were felt as far away as Finland, Greenland, and even the Caribbean.

Historical records show the immense scale of the loss. Approximately 85 percent of Lisbon's buildings were destroyed. This included famous palaces and much of the city's unique 16th-century Manueline architecture.

The Royal Ribeira Palace was lost to the earthquake and tsunami. This loss included a royal library of 70,000 volumes and many famous paintings. The archives of early explorers like Vasco da Gama were also lost. Death tolls were very high. Estimates suggest 30,000 to 40,000 people died in Lisbon. Another 10,000 people may have died in Morocco. Total deaths in the region may have reached 50,000.

In the aftermath, the Portuguese government took immediate action. King Joseph I and the Prime Minister, the Marquis of Pombal, survived. Pombal organized relief efforts to heal the living and bury the dead. To prevent disease, many corpses were loaded onto barges and buried at sea. The army was deployed to maintain order. To deter looters, the king ordered gallows to be built, and over thirty people were executed. The king developed a fear of living inside walls after the event. He lived in a large complex of tents and pavilions in the hills of Ajuda.

Reconstruction efforts led to a completely new city design. The chief engineer, Manuel da Maia, presented several plans for rebuilding. The leaders chose the boldest option. They decided to raze the entire Baixa quarter. They then laid out new, wide streets.

This new urban planning focused on order and safety. Engineers also developed the "gaiola pombalina." This was a seismically protective wooden structure. It was designed to help buildings withstand future earthquakes. This marked an early step in the history of earthquake engineering.

The 1755 earthquake had profound intellectual and scientific consequences. It was the first earthquake studied scientifically for its effects over a large area. This event led to the birth of modern seismology. Philosophers of the European Enlightenment also discussed the event deeply. It inspired major developments in theodicy, which is the study of how a good God can exist alongside evil. The disaster changed the way humans approached both science and religion. It showed that natural forces could reshape entire empires and human thought forever.