1. The most massive earthquake ever recorded was a magnitude 9.5 in Chile back in 1960.
2. An earthquake can affect the length of the day.
The 2011 earthquake near Japan increased the Earth’s rotation speed, shortening the day by 1.8 microseconds.
3. There are about 500,000 detectable earthquakes in the world each year.
One hundred thousand of those can be felt, and 100 of them cause damage.
4. About 90% of the world’s earthquakes occur along the Ring of Fire, an area in the Pacific Ocean basin.
5. An earthquake caused Everest to shrink.
On 25 April 2015, a magnitude 7.8 earthquake inflicted severe damage to the nation of Nepal, causing several Himalayan mountains to shrink, including Mount Everest, which shrunk by one inch.
6. Japan suffers 1,500 earthquakes every year.
Tokyo has been destroyed by earthquakes and tsunamis from 1608 to 1945, on average, once every five years.
7. Since 1900, there have been an average of 18 major earthquakes and one great earthquake per year.
8. Each year the southern California area has about 10,000 earthquakes—the majority of which go unnoticed.
However, if there is a massive earthquake, the aftershock sequence will produce many more earthquakes of all magnitudes for months.
9. Moonquakes (“earthquakes” on the moon) do occur.
They happen less frequently and have smaller magnitudes than earthquakes on the Earth.
10. An earthquake on Dec. 16, 1811, caused parts of the Mississippi River to flow backwards.
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