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.
Today in Earthquake History
December 12, 1992
M 7.8, Indonesia – One of the world's deadliest earthquakes. At least 2,200 people killed or missing in the Flores… Read More