A long-lost tectonic fragment may be shaking Northern California
Seismic tremors reveal a shallow fragment of an ancient tectonic plate beneath Northern California, helping explain damaging earthquakes near the surface.
Seismic tremors reveal a shallow fragment of an ancient tectonic plate beneath Northern California, helping explain damaging earthquakes near the surface.
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Nuclear weapons haven’t been tested in the United States since 1992. Find out why, and what could happen if the hiatus ends.