This was the second time in 23 years that the area had been affected by a strong earthquake. On February 9, 1971, the San Fernando earthquake (also known as the Sylmar earthquake) struck, having a magnitude of 6.5.
This was the second time in 23 years that the area had been affected by a strong earthquake. On February 9, 1971 the San Fernando earthquake (also known as the Sylmar earthquake) struck, having a magnitude of ,6.5.