U.S. Geological Survey Earthquake Hazards Program
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USA (Magnitude 1+)
February 10, 2010 05:00:06 UTC
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Our scientists study locations around the world. Learn about research conducted in our regional offices, regional seismic network monitoring, and local activities of interest.
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.
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Slab Models for Subduction Zones
Three-dimensional compilation of global subduction geometries separated into regional models for each major subduction zone.
