Earthquake Information
Chronological Earthquake Index
North San Jacinto Fault Earthquake
TYPE OF FAULTING: right-lateral strike-slip
TIME: July 22, 1923 / 11:28 pm, PST
LOCATION: 34° 00' N, 117° 15' W 11 km (7 miles) south of San Bernardino about 88 km (55 miles) east of Los Angeles
MAGNITUDE: ML6.3
FAULT INVOLVED: San Jacinto fault
Damage from this quake, which awoke sleepers across southern California, was greatest in San Bernardino and Redlands, though it consisted primarily of minor damage -- chimneys thrown down, broken windows, and the like. Two people were critically injured, but no one was killed. Those buildings which sustained significant damage in the shaking were generally of poor construction. The San Bernardino County Hospital and the Hall of Records were badly damaged. Probably the greatest damage occur\ red at the State Hospital at Patton, about two miles from the epicenter. Trees fell in the nearby San Bernardino Mountains. In Los Angeles, damage was slight. The shaking was felt as far away as Needles and Santa Barbara.
Damage to a store-front in Redlands. This picture was taken three
days after the quake; clean-up and repairs were well under way.
(Photo: Homer Laughlin)
