( ( ( Basing ( its values ) ) ( on ( ( ( ( ( ( the ( maximum amplitude ) ) , ) or ) height ) , ) ( of ( ( the ( seismic waves ) ) ( released ( during ( an earthquake ) ) ) ) ) ) ) ) ( , ( ( the ( Richter Scale ) ) ( ( measures ( ( the magnitude ) ( of ( an earthquake ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Basing) (NP (PRP$ its) (NNS values)) (PP (IN on) (NP (NP (NP (DT the) (JJ maximum) (NN amplitude)) (, ,) (CC or) (NP (NN height)) (, ,)) (PP (IN of) (NP (NP (DT the) (JJ seismic) (NNS waves)) (VP (VBN released) (PP (IN during) (NP (DT an) (NN earthquake)))))))))) (, ,) (NP (DT the) (NNP Richter) (NNP Scale)) (VP (VBZ measures) (NP (NP (DT the) (NN magnitude)) (PP (IN of) (NP (DT an) (NN earthquake))))) (. .)))
Basing its values on the maximum amplitude, or height, of the seismic waves released during an earthquake, the Richter Scale measures the magnitude of an earthquake.
(ROOT (S (NP (NP (DT The) (NN height)) (PP (IN of) (NP (DT the) (NN wave)))) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB determine) (NP (NP (DT the) (NN magnitude)) (PP (IN of) (NP (DT an) (NN earthquake))))))))) (. .)))