The frequency of a major rupture in the Puente Hills Fault is on the order of once per several thousand years . This frequency of occurrence is relatively low compared to the San Andreas Fault , which is a transform fault . More specifically , geologists have determined that the fault has ruptured at least four times in the past 11,000 years . The magnitudes of such earthquakes are considered to have been 7.2 – 7.5 . The highest magnitude in that range would be about fifteen times stronger than the 1994 Northridge earthquake in terms of energy release . That event was the strongest in recorded history for the Los Angeles metropolitan area
1994 Northridge earthquake
1994 Northridge earthquake
Puente Hills Fault