#EQHistory: 3/10/1933 M6.4 Long Beach. This EQ destroyed several school buildings. Had it struck during school hours, the death toll would have been far higher. Just 30 days later, California passed the Field Act — one of the first US laws mandating seismic building standards. buff.ly/cKH6m49
#EQHistory: 1971 M6.6 San Fernando. The event killed 65. In the aftermath Caltech seismologist Clarence Allen went to Sacramento with a message: geologists know where active faults are and we can prevent building on them. His testimony helped the passage of the Alquist-Priolo Act. buff.ly/Yzs6NPt
#EQHistory: Today marks the 40th anniversary of the 1985 M8.0 Michoacan, Mexico, earthquake. Causing widespread damage and loss of 9500+ lives, many in the greater Mexico City area, this event was the impetus for creating Mexico's Earthquake Early Warning system, the first world's public EEW system.
#EQhistory: July 1952 M7.5 Kern County. While we tend to remember eqs by the main shock, note that it isn't always the cause of the worst damage. Substantial damage and 2 fatalities occurred in the aftershock sequence, with 6 events > M5 on the same day as the main shock. buff.ly/k9VSm0B
This statement was an early example of an aftershock forecast. Today the SCSN regularly includes an aftershock forecast in their special reports page for events of merit. For more on the earthquake visit: buff.ly/3TgTshg @caltecharchives #EQHistory
