An array of GPS instruments near the San Andreas Fault System has discovered nearly 125 mile-wide “lobes” of uplift and subsidence—a few millimeters of motion each year—straddling the fault system. This large scale motion was previously predicted in models but until now had not been documented.

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An array of GPS instruments near the San Andreas Fault System has discovered nearly 125 mile-wide “lobes” of uplift and subsidence—a few millimeters of motion each year—straddling the fault system. This large scale motion was previously predicted in models but until now had not been documented.