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《Progress in Geophysics》 2006-04
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Pn geometric spreading in the upper mantle with linear velocity gradient

HE Yong-feng~1,ZHAO Ke-chang~2,ZHANG Xian-bing~2, CHEN Xiao-fei~2, JIN Ping~3(1.Academy of Armored Forces Engineering,Beijing 100072,China;2.School of Earth and Space Science,Peking University,Beijing 100871,China;North-west Institute of Nuclear Technology,Xi'an 710024,China)  
Pn geometric spreading is a dominate reason for Pn attenuation.This report gives a theoretical study of the dependence of Pn geometric spreading on the velocity gradient in the upper mantle.The results show that Pn attenuation is very sensitive to the velocity gradient in the upper mantle.For example,the Pn amplitude at 1000 km is a factor of 10 larger for a model with a weak velocity gradient(equivalent to the earth-flattening transformation of a homogeneous upper mantle) than a model consisting of layer over an infinite halfspace,and the Pn amplitude increases after a critical distance for linear gradient models.These results are similar to those of Sereno(1989).Also,Pn geometric spreading is frequency-dependent for an upper mantle model with a simple linear velocity gradient. The results are important because most methods for estimating Pn attenuation require assumptions regarding geometric spreading.
【Fund】: 国家自然科学基金项目(40521002)资助
【CateGory Index】: P315
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