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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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Tsunami alerting systems

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Earthquake Information Bulletin (USGS)

Earthquake lights

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Earthquake Information Bulletin (USGS)

4 Earthquake: Major offshore earthquakes recall the Aztec myth

Long before the sun clears the eastern mountains of April 29, 1970, the savanna highlands of Chiapas tremble from a magnitude 6.7 earthquake centered off the Pacific coast near Mexico’s southern border. Then, for a few hours, he Isthmus of Tehuantepec is quiet.

Earthquake Information Bulletin (USGS)