The second Supermoon will appear on the night of August 30-31, while the first was on August 1. The supermoon is associated with the gravitational load on the lithospheric plates that make up the Earth’s surface. Therefore, two supermoons in a row can cause a massive earthquake.
The principle here is the same, then the connection of the full moon and the new moon with the tides. Statistics collected over many years by Russian mathematician Mikhail Kovalev say that the Moon is causing an increase in seismic activity on Earth. The strongest effect lasts for about two weeks: one week before and one week after the Supermoon.
Source: Ferra

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