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World (Magnitude 4+)
Sun May 11 22:00:39 GMT
USA (Magnitude 1+)
Sun May 11 22:30:31 GMT
Today's Earthquake Fact
A seismic wave shadow zone was discovered in about 1910, by measuring how P and S waves travel through the earth and out the other side. From the lack of S waves and a great slowing of the P wave velocity (by about 40%), it was deduced that the outer core is made of liquid. The shadow zone also defined the diameter of the core.
