Earthquake Information

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Cajon Pass Earthquake

TYPE OF FAULTING: right-lateral strike-slip
TIME: July 22, 1899 / 12:32 pm, PST
LOCATION: near 34° 15' N, 117° 30' W roughly 24 km (15 miles) northwest of San Bernardino about 65 km (41 miles) ENE of Los Angeles
MAGNITUDE: roughly ML 5.7 (?)

This quake was reported felt over most of southern California, with intensities reaching VIII or IX on the Rossi Intensity Scale (basically an early version of the Modified Mercalli Scale) in the epicentral area, which was somewhere near Lytle Creek and Cajon Pass. Landslides triggered by the shaking blocked both the Lytle Creek Canyon road and the road through Cajon Pass. The heaviest damage to buildings occurred in San Bernardino, Highland, and Patton. Damage was also reported in Redlands, Pomona, Riverside, Pasadena, and Los Angeles, though it was mostly minor. No deaths were reported, and the number of injuries caused is uncertain.