Generation of Null in Rg Wave by Underground Explosions

Autor:	Yong-Feng He, Yao‐Feng He, Xiaofei Chen, Ping Jin
Rok vydání:	2005
Předmět:	Physics Scattering business.industry Null (mathematics) General Medicine Eigenfunction Displacement (vector) Dipole symbols.namesake Optics Normal mode Quantum electrodynamics symbols Rayleigh wave business Excitation
Zdroj:	Chinese Journal of Geophysics. 48:708-713
ISSN:	0898-9591
DOI:	10.1002/cjg2.704
Popis:	It was widely accepted that the near-source scattering of explosion-generated Rg into S is the primary contributor to the low-frequency Lg from nuclear explosions, because the prominent low-frequency spectral null in Lg coincides with that in Rg from a compensated linear vector dipole (CLVD) source. In this study, the mechanism of the excitation of the spectral null of Rg generated by CLVD source is analyzed in detail with normal mode method. The most important result in this study is that the spectral null is due to a combination of displacement eigenfunction and its derivative of the fundamental-mode Rayleigh wave controlled by CLVD source, the zero-crossing alone can not fully explain the excitation of the spectral null.
Databáze:	OpenAIRE
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