سرعة الموجة الأولية/ سرعة الموجة الثانوية

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Series	Investigations in Geophysics, No. 13
Author	Robert Sheriff
DOI	http://dx.doi.org/10.1190/1.9781560802969
ISBN	ISBN 978-1-56080-118-4
Store	SEG Online Store

Ratio of P-wave ($\alpha$) to S-wave ($\beta$) velocities. Poisson's ratio

$\sigma ={\left[\left({\frac {\displaystyle \alpha }{\displaystyle \beta }}\right)^{2}-2\right] \over \left[2\left({\frac {\displaystyle \alpha }{\displaystyle \beta }}\right)^{2}-2\right]}\quad$.