I read the whole thing and my goodness! That is huge. I'm glad California never had one that high while I lived there, and I hope it never happens. At the end of the article, it states: The catastrophic upheavals of the type reported in the winter of 1811 to 1812 occur about every five or six hundred years.
And then this: 1920 One of the deadliest earthquakes in history hit the Gansu province of midwestern China, causing massive landslides and the deaths of an estimated 200,000 people. The earthquake, which measured 8.5 magnitude on the Richter scale, affected an area of some 25,000 square miles, including 10 major population centers.
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