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What was the geological setting of the earthquake in Lisbon Portugal in 1755?

What was the geological setting of the earthquake in Lisbon Portugal in 1755?

Modern research indicates that the main seismic source was faulting of the seafloor along the tectonic plate boundaries of the mid-Atlantic. The earthquake generated a tsunami that produced waves about 20 feet (6 metres) high at Lisbon and 65 feet (20 metres) high at Cádiz, Spain.

How many died in the 1755 Lisbon earthquake?

1755 Lisbon earthquake/Number of deaths

What caused the great Lisbon earthquake of 1755?

In 1755, the great Lisbon earthquake (estimated magnitude 8.7) killed 60,000 people in southern Iberia and northwest Morocco and generated a 5- to 10-m-high tsunami wave. Recent evidence suggests that an eastward-dipping subduction zone beneath Gibraltar may have caused the earthquake.

When was the big earthquake in Lisbon?

November 1, 1755
1755 Lisbon earthquake/Start dates

What was the largest intensity from the Lisbon earthquake?

1755 Lisbon earthquake

Local time 09:40
Magnitude 8.5–9.0 Mw (est.)
Epicenter 36°N 11°WCoordinates: 36°N 11°W About 200 km (120 mi) west-southwest of Cape St. Vincent and about 290 km (180 mi) southwest of Lisbon
Fault Azores-Gibraltar Transform Fault
Max. intensity XI (Extreme)

Is Lisbon due for another earthquake?

It also addresses recent research that suggests that Lisbon’s earthquake risk today is driven not by the prospect of a recurrence of a 1755-type event—which is estimated to have a return period of between 3,000 and 4,000 years—but rather by the possibility of an earthquake of more moderate magnitude, but one much …

Could the Lisbon earthquake happen again?

How bad was the Lisbon earthquake?

The 1755 Lisbon earthquake was one of the most destructive and deadly earthquakes in history, killing more than a third of the entire population of the Portuguese capital. Tens of thousands of Portuguese who survived the earthquake were killed by the tsunami triggered by the earthquake.

Do tsunamis happen in Portugal?

Tsunamis are rare events that happen mostly in Asia and Americas but also in other parts of the world. Portugal suffered two recent major earthquakes and tsunamis in February 1969 in continental Portugal and in January 1980 in the Azores killing some 80 people altogether.

Is Portugal at risk of tsunami?

In a total of 3 tidal waves classified as a tsunami since 1531 a total of 63,000 people died in Portugal. Tsunamis therefore occur only rarely here.

Is Lisbon at risk of earthquake?

Several onshore faults in southwestern Portugal have been found to be seismically active. Most notable is the active fault zone in the Lower Tagus Valley (LTV). Thus the return period of magnitude 6 to 7 earthquakes along the LTV could be as short as 150 to 200 years, making Lisbon the highest risk area in Portugal.

Do tsunamis occur in Portugal?

Tsunamis therefore occur only rarely here. The strongest tidal wave registered in Portugal so far reached a height of 15.20 meters. At this Tsunami on 11/01/1755 a total of 63,000 people have been killed.

Where was the epicentre of the Lisbon earthquake of 1755?

The epicentre of the Lisbon earthquake of 1755 was 200 Km from Cape Vicente in the Atlantic Ocean. This massive slip of the Azores-Gibraltar transform fault generated one of the largest tsunamis to hit Europe. The tsunami struck Lisbon 45 minutes after the earthquake had subsided.

How tall was the tsunami that hit Lisbon in 1755?

The tsunami resulting from the 1755 earthquake was 9 meters high when it hit Lisbon. Prior to the first of the three tsunamis the water drained from the Rio Tejo estuary and revealed ship wrecks loaded with treasures.

How many people died in the Lisbon earthquake?

By the end of the week 75,000 people in Lisbon had died as a direct result of the earthquake, making the earthquake of 1755 one of the most deadly natural disasters the world has ever experienced. The devastation caused many Portuguese to question their religious beliefs and the horrific event has shaped Lisbon’s…

Why did the Lisbon earthquake happen on All Saints Day?

Violent shaking demolished large public buildings and about 12,000 dwellings. Because November 1 is All Saints’ Day, a large part of the population was attending mass at the moment the earthquake struck; the churches, unable to withstand the seismic shock, collapsed, killing or injuring thousands of worshippers.