(S (S (S (NP (BASENP (DT The) (JJ second) (NN quake)) (PP (IN of) (BASENP (NN 5.6) (NN magnitude)))) (VP (VBD struck) (NP (BASENP (QP (RB just) (NN five)) (NNS minutes)) (PP (IN after) (BASENP (DT the) (JJ first)))))) (CC and) (S (BASENP (DT a) (ADJP (NN 6.1) (NN magnitude)) (NN quake)) (VP (VP (VBN struck) (ADVP (NP (QP (RB just) (BASENP (RB over) (DT an))) (NN hour)) (RBR later))) (COMMA ,) (S (VP (VP (VBN followed) (PP (IN by) (BASENP (DT a) (NN magnitude) (NN 5.9)))) (ADVP (BASENP (QP (RB about) (NN 15)) (NNS minutes)) (RBR later))))))) (PERIOD .))