( ( ( the ( Richter scale ) ) ( for ( measuring ( ( the intensity ) ( of earthquakes ) ) ) ) ) ; )
(ROOT (NP (NP (NP (DT the) (JJR Richter) (NN scale)) (PP (IN for) (S (VP (VBG measuring) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (NNS earthquakes)))))))) (: ;)))
the Richter scale for measuring 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.