In 1910 a seismic wave shadow zone was discovered while measuring how P and S waves travel through the earth and out the other side,. The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves. The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core.
Foundation, Concrete and Earthquake Engineering
No comments:
Post a Comment