1933 Long Beach earthquake

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1933 Long Beach earthquake
1933 Long Beach earthquake is located in California
1933 Long Beach earthquake
Los Angeles
Los Angeles
Date March 10, 1933 (1933-03-10)
Origin time 5:54 P.M. PST [1]
Magnitude 6.4 Mw [2]
Depth 10 km (6.2 mi) [2]
Epicenter 33°37′N 118°11′W / 33.62°N 118.18°W / 33.62; -118.18Coordinates: 33°37′N 118°11′W / 33.62°N 118.18°W / 33.62; -118.18 [2]
Areas affected Southern California
United States
Total damage $40 million [1]
Max. intensity VIII (Severe) [1]
Casualties 115 killed [1]
Damage to the John Muir School, Pacific Avenue, Long Beach

The 1933 Long Beach earthquake took place on March 10 at 5:54 P.M. PST with a moment magnitude of 6.4 and a maximum Mercalli intensity of VIII (Severe). The epicenter was offshore, southeast of Long Beach on the Newport–Inglewood Fault. Damage to buildings was widespread throughout Southern California, United States. An estimated forty million dollars' worth of property damage resulted, and 115 people died. Many of these fatalities occurred as people ran out of buildings and were hit by falling debris.

The major damage occurred in the thickly settled district from Long Beach to the industrial section south of Los Angeles, where unfavorable geological conditions (landfill, water-soaked alluvium) combined with poorly constructed buildings to increase the damage. At Long Beach, buildings collapsed, water tanks fell through roofs, and houses were tossed off their foundations. School buildings were among the structures that incurred the most severe damage.

The earthquake highlighted the need for earthquake-resistant design for structures in California. Many school buildings were damaged, with more than 230 school buildings that either were destroyed, suffered major damage, or were judged unsafe to occupy, that the Field Act was passed by the California State Legislature on April 10, 1933. The Field Act mandated that school buildings must be earthquake-resistant. If the earthquake had occurred during school hours, the death toll would have been much higher.[3]

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