A Defining Moment for San Francisco, 111 Years Ago Today

One hundred eleven years ago today, on April 18 at 5:12 a.m., a violent earthquake shook San Francisco.   This was 30 years before the Richter scale was developed to measure an earthquake’s magnitude, and nearly 70 years before the system we use today, the Moment Magnitude scale. The scale ranks an earthquake on a scale…

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