When did scientists first understand that earthquakes happen on faults?
Quick Answer
The link between earthquakes and faults became clear in the late 19th and early 20th centuries, especially after studies of surface rupture and fault displacement.
The Full Story
Early explanations of earthquakes varied widely, but modern geology gradually revealed that many quakes happen when rocks slip along faults. This understanding grew in the late 1800s and early 1900s as scientists studied surface ruptures from major earthquakes. The 1906 San Francisco earthquake was especially important because geologists documented a huge fault break along the San Andreas Fault. That evidence helped confirm that earthquakes are caused by sudden movement in the Earth's crust.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The discovery that earthquakes are really fault slips"
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