Tag Archives: geologic

Ancient Chinese Seismometer


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In ancient China, earthquake warnings arrived via metal dragons and frogs. The mouths of the dragons were hinged and held a brass ball. When the pendulum would swing slightly, the ball would release and noisily fall into the mouth of … Continue reading

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Plate Tectonics


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The earthquake and ensuing tsunami in Japan were a result of plate tectonics, or large scale movement of the Earth’s crust. The major plates are African, Antarctic, Australian, Eurasian, Indian, North American, South American, and Pacific. The minor plates (of … Continue reading

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