(S (S (S (S (BASENP (DT The) (NN aftershock)) (VP (VBD reached) (NP (BASENP (DT a) (NN magnitude)) (PP (IN of) (BASENP (NN 5.9)))))) (SBAR (IN with) (S (BASENP (DT the) (NN epicenter)) (VP (VBN located) (ADVP (BASENP (NN nineteen) (NNS kilometers)) (ADVP (RB west) (PP (IN of) (BASENP (NNP Pichilemu))))))))) (COMMA ,) (PP (VBG according) (PP (TO to) (NP (NP (BASENP (DT the) (NNP University)) (PP (IN of) (BASENP (NNP Chile) (NNP Geological) (NNP Survey)))) (PRN (LRB -LRB-) (BASENP (NNP UCGS)) (RRB -RRB-)))))) (PERIOD .))