Newport–Inglewood Fault

The fault extends for 47 mi (76 km)[1] (110 miles if the Rose Canyon segment is included) from Culver City southeast through Inglewood and other coastal communities to Newport Beach at which point the fault extends east-southeast into the Pacific Ocean.

[2] The fault was first identified after a magnitude 4.9 earthquake struck near Inglewood, California on June 21, 1920.

[3] Due to the lack of earthquake-resistant construction in southern California at this time, this quake caused considerable damage in the Inglewood area and was a preview of what was to come almost 13 years later.

Seventy schools in the Long Beach and Compton area were destroyed and an additional 120 were heavily damaged by the quake; had this tremor struck during school hours, the death toll would have been much higher, some estimates as high as 1000.

[5] In July 2015, Jim Boles, a University of California at Santa Barbara professor, reported that helium-3 was leaking naturally from oil wells up to 1.8 mi (2.9 km) deep, along a 30 mi (48 km) stretch from Los Angeles's Westside to Newport Beach, suggesting that the fault runs deep, though not necessarily changing the earthquake outlook.