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The program’s description as installed on consumers’ phones reads:”ShakeAlertLA sends you notifications when a 5.0 or higher earthquake happens in Los Angeles County.”
— Andrea Gutierrez (@AndreaGtrrz) July 4, 2019

AP Photo/John Antczak
Seismologist Lucy Jones discusses the string’s first 6.4 earthquake in Caltech on July 4.

— Dr. Lucy Jones (@DrLucyJones) July 6, 2019