Can a total solar eclipse cause an earthquake?

A total solar eclipse will occur on Monday, August 21, 2017 in Madras, Oregon.

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With an earthquake shaking the East Coast of the United States before a total solar eclipse, one might wonder if the Moon's position has anything to do with this seismic event.

In ancient times, the sky was seen as the perfect clockwork. The stars and planets move in fixed paths, and it was believed that any changes in this apparent harmony must also affect the Earth. Lunar and solar eclipses have been blamed for many natural disasters, including earthquakes. It's easy on social media to discover (supposed) predictions of seismic events or even volcanic eruptions based on the position of the sun, moon, and even other planets. Serious research is hard to find.

Research published in 2016 suggests a possible connection between earthquakes and the Moon. By studying the frequency of large earthquakes in Chile, California, and Japan, researchers discovered that earthquakes larger than magnitude 5 are more likely to occur during a new or full moon when the sun, moon, and Earth are aligned. In theory, this alignment causes the tidal pull on land over the sea and changes the distribution of mass in the ocean basin. This extra mass of water can put additional stress on fault systems found along the edges of continents, such as the Cascadia zone, the Andean subduction zone, and islands like Japan.

The effect, the researchers admit, is very weak, and likely only works in shallow faults. Based on their calculations, only one in 10,000 earthquakes that occur during a period of increased tidal pressure can be linked to the Moon's location.

The gravity of the Moon – or even the Sun – is far too weak to trigger an earthquake compared to the forces that move tectonic plates. Tectonic movements and the presence of faults or weak rock layers underground are still the main factors controlling the occurrence of an earthquake.

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