( ( ( The intensity ) ( of ( an earthquake ) ) ) ( ( is ( measured ( on ( ( ( the ( Richter Scale ) ) , ) ( which ( ( goes ( from 0 ) ) upward ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (NN intensity)) (PP (IN of) (NP (DT an) (NN earthquake)))) (VP (VBZ is) (VP (VBN measured) (PP (IN on) (NP (NP (DT the) (NNP Richter) (NNP Scale)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ goes) (PP (IN from) (NP (CD 0))) (ADVP (RB upward))))))))) (. .)))
The intensity of an earthquake is measured on the Richter Scale, which goes from 0 upward.
(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.