A mountain range grew 40 cm in 15 seconds ποΈ . . . At 4:31 a.m. on January 17, 1994, the Northridge earthquake shoved the Santa Susana Mountains upward by roughly 40 centimeters. Ground acceleration hit 1.82 g β objects briefly weighed less than gravity's pull. The Northridge Meadows apartments pancaked onto their parking level, killing 16 people who were asleep upstairs.
Source
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