The quakes on Thursday and Friday were so violent that they rocked buildings, tore roads and foundations and led to fire and gas leaks.
How could nobody see this coming? Well, scientists say that they have no safe way to predict earthquakes. The US Geological Survey says its scientists can only calculate the probability that a significant earthquake will occur within a certain area within a few years.
That does not mean it knows that an earthquake is coming.
And without long-term data and animal observations, researchers are still not sure if the unusual behavior is related to earthquakes or any other kind of coincidence in the animal population.
It is no longer advisable to go to the entrance
The United States Geological Survey says this is outdated council In the past, the doors were stronger than in other parts of the house, but that's no longer the case, and they usually have swing doors that can hurt you.
"They are safer at laying, covering, and holding them under a stable To practice furniture like a strong desk or table, "says the USGS.
If you're traveling by car, stop by the side of the road (preferably not under overpasses or power lines). 
The ground does not open during a quake
We all thought it possible after seeing Dwayne Johnson's dramatic rescues in the movie "San Andreas". But the USGS says that this only happens to Hollywood characters – not really. While shallow fissures can form, faults do not occur in an earthquake, according to the USGS.
"Fissures are only found in movies and novels, the ground on both sides of the bug glides past each other, they do not pull apart," they say.
California is not thrown into the ocean
Here are some comforting words for every California resident who is thinking about a permanent resettlement.
The USGS calls the idea that the state swept at sea "absolutely impossible".
What will continue to happen, however, is the slow movement of southwestern California north toward Alaska, passing by central and eastern California.
"The Pacific Plate moves northwest relative to the North American Plate," says USGS.
One day, but in 15 million years, Los Angeles and San Francisco will be neighbors. A few million years later, LA homes will be equipped with postcodes in Alaska.
Earthquake weather does not exist
There is no such thing.
According to USGS no correlation between weather and earthquake was found.
"Earthquakes start many (miles) below the area affected by the surface weather," the agency said. "People tend to notice earthquakes that match the pattern and forget those who do not."
"Every region of the world has a history of earthquake weather, but the nature of the weather is what they had for their most memorable earthquake," it adds.