Which earthquake is notable for being one of the largest recorded in California with significant impacts on safety regulations?

The San Fernando earthquake, which occurred on February 9, 1971, is notable for its magnitude and the significant changes it prompted in safety regulations across California. With a moment magnitude of 6.6, the earthquake caused extensive damage, particularly in the San Fernando Valley area, and resulted in 64 fatalities and numerous injuries.

The event brought to light the inadequacies of existing building codes and emergency preparedness measures, leading to the establishment of more stringent safety regulations aimed at reducing risk in future seismic events. This includes the improvement of construction practices, retrofitting of older buildings, and enhancing emergency response protocols, reflecting a statewide commitment to better earthquake resilience.

The other earthquakes listed may have varying degrees of impact or significance, but none have spurred such a profound shift in regulations as the San Fernando earthquake. The lessons learned from its aftermath have shaped California's current policies and practices aimed at mitigating earthquake hazards, making it a pivotal event in the state's geological and regulatory history.