The fault was first identified after a 4.9 magnitude quake struck near Inglewood , California on June 21 , 1920 . 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 . The Long Beach earthquake occurred on March 10 , 1933 , centered along the southern segment of this fault , and registering a magnitude 6.3 ; this quake killed 115 people and was the second most deadly earthquake in California history , after the 1906 San Francisco earthquake . 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 . In response to the poor performance of school structures , the California legislature passed the Field Act in April , mandating earthquake-resistant construction for all new school buildings
Long Beach earthquake
1933 Long Beach earthquake
Newport–Inglewood Fault