( ( Shape ( of surface ) ) ( ( ( maps ( the ( wave velocity ) ) ) ( for ( ( the fastest ) ( of ( the ( two ( quasi-transverse waves ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Shape)) (PP (IN of) (NP (NN surface)))) (VP (VBD maps) (NP (DT the) (NN wave) (NN velocity)) (PP (IN for) (NP (NP (DT the) (JJS fastest)) (PP (IN of) (NP (DT the) (CD two) (JJ quasi-transverse) (NNS waves)))))) (. .)))
Shape of surface maps the wave velocity for the fastest of the two quasi-transverse waves.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD two) (NNS types)) (PP (IN of) (NP (NN surface) (NNS waves))))) (. .)))