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Part of the U S Department of the Interior, the USGS began in 1879 to study the nation’s lands and resources Today, we monitor, analyze, and predict Earth’s changing systems
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The U S Geological Survey (USGS) is the nation's largest water, earth, and biological science and civilian mapping agency It collects, monitors, analyzes, and provides scientific understanding of natural resource conditions, issues, and problems
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2025-12-23 03:24:17 (UTC-08:00) 5 4 km
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- Swarm of earthquakes strikes in San Ramon; largest at 4. 0-magnitude
A wave of roughly 50 earthquakes was recorded in the Tri-Valley over the weekend, ranging up to a preliminary magnitude of 4 0 struck southeast of San Ramon about 8 p m Friday, USGS said
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- Earthquake swarms rattle California. What it means for the Big One . . .
For more than a month, the Bay Area has been subjected to a seemingly ceaseless stampede of earthquakes, rattling windows and raising fears across California
- Earthquake swarm strikes San Ramon area Friday night
A cluster of earthquakes struck the San Ramon area Friday night, continuing a pattern of seismic activity in recent weeks, according to the U S Geological Survey
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