The 1687 Peru earthquake occurred at 11:30 UTC on October 20. It had an estimated magnitude

Moment magnitude scale

The moment magnitude scale is used by seismologists to measure the size of earthquakes in terms of the energy released. The magnitude is based on the seismic moment of the earthquake, which is equal to the rigidity of the Earth multiplied by the average amount of slip on the fault and the size of...

 of 8.4–8.7 and caused severe damage to Lima

Lima

Lima is the capital and the largest city of Peru. It is located in the valleys of the Chillón, Rímac and Lurín rivers, in the central part of the country, on a desert coast overlooking the Pacific Ocean. Together with the seaport of Callao, it forms a contiguous urban area known as the Lima...

, Callao

Callao

Callao is the largest and most important port in Peru. The city is coterminous with the Constitutional Province of Callao, the only province of the Callao Region. Callao is located west of Lima, the country's capital, and is part of the Lima Metropolitan Area, a large metropolis that holds almost...

 and Ica

Ica (city)

The city of Ica is the capital of the Ica Region in southern Peru. While the area was long inhabited by varying cultures of indigenous peoples, the Spanish conquistador Gerónimo Luis de Cabrera claimed its founding in 1563. As of 2005, it had an estimated population of over 219,856...

. It triggered a tsunami

Tsunami

A tsunami is a series of water waves caused by the displacement of a large volume of a body of water, typically an ocean or a large lake...

 and overall about 5,000 people died.

Tectonic setting

The earthquake occurred along the boundary between the Nazca Plate

Nazca Plate

]The Nazca Plate, named after the Nazca region of southern Peru, is an oceanic tectonic plate in the eastern Pacific Ocean basin off the west coast of South America. The ongoing subduction along the Peru-Chile Trench of the Nazca Plate under the South American Plate is largely responsible for the...

 and the South American Plate

South American Plate

The South American Plate is a continental tectonic plate which includes the continent of South America and also a sizeable region of the Atlantic Ocean seabed extending eastward to the Mid-Atlantic Ridge....

. The earthquake is likely to be a result of thrust-faulting

Thrust fault

A thrust fault is a type of fault, or break in the Earth's crust across which there has been relative movement, in which rocks of lower stratigraphic position are pushed up and over higher strata. They are often recognized because they place older rocks above younger...

, caused by the subduction

Subduction

In geology, subduction is the process that takes place at convergent boundaries by which one tectonic plate moves under another tectonic plate, sinking into the Earth's mantle, as the plates converge. These 3D regions of mantle downwellings are known as "Subduction Zones"...

 of the Nazca plate beneath the South American plate.

The coastal parts of Peru and Chile have a history of great megathrust earthquake

Megathrust earthquake

Megathrust earthquakes occur at subduction zones at destructive plate boundaries , where one tectonic plate is forced under another. Due to the shallow dip of the plate boundary, which causes large sections to get stuck, these earthquakes are among the world's largest, with moment magnitudes ...

s originating from this plate boundary, such as the 1960 Valdivia earthquake.

Damage

The port of Pisco

Pisco, Peru

Pisco is a city located in the Ica Region of Peru, the capital of the Pisco Province. The city is around 9 metres above sea level. Originally the villa of Pisco was founded in 1640, close to the indigenous emplacement of the same name...

was completely destroyed by the tsunami, with at least three ships being swept over the remains of the town.

Earthquake

The earthquake was probably followed by another large event further to the south. A magnitude of 8.7 has been estimated from tsunami run-up heights and by comparison with the earthquake of 1974.