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
August 3, 1951
M 6.0, Nicaragua – The earthquake opened a side of Cosiguina Volcano, releasing water from its crater. The subsequent mudflow destroyed the town of Potosi. A larger earthquake… Read More