The Stanford scientists used weak vibrations under the Earth's core to measure and follow the movement of seismic waves. These waves are produced by the ocean waves crashing into the Earth's core. Although billions of times weaker than seismic waves generated by earthquakes, these ambient waves still follow the path an earthquake wave would.
Based on their measurements, an earthquake generated seismic waves will be funneled toward Los Angeles if the southern San Andreas Fault section of California were to experience an earthquake.
The scientists further predict that the seismic waves will be futher amplified when it reaches Los Angeles because the city sits atop a large sedimentary basin.
