On Oct. 19, 2023, at 10:19 a.m., millions will “Drop, Cover, and Hold On” in the Great ShakeOut, the world's largest earthquake drill ever! With over 340 million people living and working in the United States, a major earthquake could cause unprecedented devastation. Knowing what to do before a big earthquake will determine how well you survive and recover. It is only a one-minute commitment for something that can save your life.