( ( ( The ( two ( primary types ) ) ) ( of ( surface waves ) ) ) ( ( are ( ( ( ( ( ( the ( Rayleigh wave ) ) , ) ( which ( has ( some ( compressional motion ) ) ) ) ) , ) and ) ( ( ( the ( Love wave ) ) , ) ( which ( does not ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (CD two) (JJ primary) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves)))) (VP (VBP are) (NP (NP (NP (DT the) (NNP Rayleigh) (NN wave)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ has) (NP (DT some) (JJ compressional) (NN motion)))))) (, ,) (CC and) (NP (NP (DT the) (NN Love) (NN wave)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ does) (RB not))))))) (. .)))
The two primary types of surface waves are the Rayleigh wave,which has some compressional motion, and the Love wave, which does not.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))