In the wake of a 4.0 magnitude earthquake on Tuesday, experts are worried that San Francisco could expect a much larger, more devastating quake in the very near future.

The Hayward fault line is responsible for this week's quake. Hayward is one of the lesser-known fault lines in northern California, but it has a notorious history. It's the same fault line that caused the 1898 quake which killed 30 people and nearly leveled the city. 

San Francisco is seven years overdue for a massive earthquake. Image 1.

Image: Wikimedia Commons

It's been 147 years since that quake, but the Hayward fault has an average frequency of earthquakes every 140 years. The five most recent quakes have been during this time frame, indicating that the Bay Area could be expecting a catastrophic earthquake very soon.



 The 1906 San Francisco earthquake on April 18 is the one most people know. It caused massive fires that killed over 3,000 people and left over 400,000 others homeless.

 San Franciscans, don't move to Seattle: experts agree that a massive earthquake is set to hit the Pacific Northwest very soon due to the pending activity of the Cascadia Subduction Zone. They warn that over 10,000 people could die and that everything west of Interstate 5 will be gone.

 The largest earthquake ever recorded was in Chile on May 22, 1960. It clocked in at a magnitude of 9.5 on the Richter scale. An earthquake with a magnitude of 12 would require a fault line larger than planet Earth itself.

Cover image: Wikimedia Commons