The ground beneath your feet is rarely as still as it seems. The United States sits atop a restless tectonic landscape, and ...
A major Hayward fault quake could shake some Bay Area communities harder than expected because of the ground beneath them, new federal simulations show.
The Pacific is ringed by a vast tectonic boundary that stretches for tens of thousands of kilometers, a shifting seam where plates grind, dive and tear past one another. That planetary-scale fault ...