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The San Francisco earthquake of 1906 was America's most deadly but not the strongest. The "Good Friday earthquake" in 1964 in Alaska was one of the strongest ever recorded on earth. Geologists estimate that this earthquake released energy about equal to that from the ex;plosion of 31.5 million tons of TNT. The laskan earthquake was so powerful that the tops of the trees near the earthquake's center were snapped off. Land was raised and l()wered a meter or so (about three feet) over an area of 140,000 square kilometers (56,000 square miles). Half of Alaska shook noticeably. In Texas, water in swimming pools sloshed. The entire earth vibrated slightly.