A sudden breaking in the rocks along a roughly 560–620-mile (900–1,000-km) stretch of the Nazca Plate caused the earthquake, which has been generally agreed to have had a magnitude of 9.5—the largest earthquake recorded in the 20th century.
What caused the Chile earthquake of 1960?
The South American Plate and the Nazca Plate moved in a quick motion which caused the massive earthquake. … Because the earthquake was caused by a subduction plate boundary, the 1960 Valdivia earthquake is considered a megathrust earthquake.
How did the 1960 earthquake happen?
The 1960 Chile earthquake was caused by the Nazca plate releasing tension and descending 15 meters underneath the South American Plate. It happened 30.5 km off the Chilean coast.
How did the 1960 Chile earthquake affect the environment?
Sinking of the ground due to the earthquake, known as subsidence, produced local flooding in Chile. This permanently altered the shorelines of much of the area in Chile impacted by the earthquake, rendering all marine navigational charts of the affected areas obsolete.
What is the longest lasting earthquake?
A devastating earthquake that rocked the Indonesian island of Sumatra in 1861 was long thought to be a sudden rupture on a previously quiescent fault.