(S (S (BASENP (DT The) (NNP US) (NNP Geological) (NNP Survey)) (VP (VP (VBD measured) (BASENP (DT the) (NN quake))) (PP (IN at) (NP (BASENP (NN 7.6)) (PP (IN on) (BASENP (DT the) (NNP Richter) (NN scale))))))) (PERIOD .))