City of Irvine
2020 Local Hazard Mitigation Plan
Figure 3-11: Seismic Shaking Potential
Earthquake in 1933. It was reported that pavement buckled, cracks appeared in the ground, and “mud volcanoes” erupted in the Los Alamitos area. 88 Seismic shaking While no significant earthquake has originated within Irvine or Orange County within the last 100 years, Irvine has no doubt felt the shaking of regional earthquakes. The nearest earthquake event to Irvine that caused significant damage throughout the Southern California region was the 1933 Long Beach earthquake. The actual epicenter for the quake was in the City of Huntington Beach; however, most of the damage occurred in areas north of the epicenter. The event caused more than $50 million in property damage and resulted in the deaths of 120 people. 89 Since Irvine (the City) did not exist during the time of the earthquake and given that the area was sparsely populated, it is unknown whether or not residents of that time experienced any damage to their property. Most of the deaths and damage from the 1933 Long Beach Earthquake occurred as a result of collapsing unreinforced masonry buildings, none of which existed in Irvine at the time.
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