( Richter ( ( invents ( a ( logarithmic ( scale ( to ( measure ( ( the intensity ) ( of earthquakes ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Richter)) (VP (VBZ invents) (NP (DT a) (JJ logarithmic) (NN scale) (S (VP (TO to) (VP (VB measure) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (NNS earthquakes))))))))) (. .)))
Richter invents a logarithmic scale to measure the intensity of earthquakes.
(ROOT (S (NP (NNS Seismologists)) (ADVP (RB originally)) (VP (VBD measured) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (DT an) (NN earthquake)))) (PP (IN with) (NP (DT the) (JJ mercalli) (NN scale)))) (. .)))
Seismologists originally measured the intensity of an earthquake with the mercalli scale.