The 1906 San Francisco earthquake left a visible gap all along the San Andreas Fault line, which can still be seen today.
Located between the North American Plate and the Pacific Plate, the San Andreas Fault is among the most known active faults on the planet. It was named so after the San Andreas Lake that was formed as a result of the fault, which was discovered in 1895 by geologist Andrew Lawson of the University of California, Berkeley.
Alice Eastwood Standing at a Rupture in 1906
After the 1906 quake, Professor Lawson established that the fault line ran down to the southern portion of California, which he named the “California Fault Line.” Immediately after this natural occurrence, the fault line could be clearly seen, as shown in this picture.
Read more about Alice https://www.nps.gov/people/alice-eastwood.htm