(S (S (NP (BASENP (DT The) (NNP Alaska) (NNP Volcano) (NNP Observatory)) (PRN (LRB -LRB-) (BASENP (NNP AVO)) (RRB -RRB-))) (VP (VP (VBD reported) (BASENP (NN today))) (SBAR (S (NP (DT a) (QT (DQL ``) (NP (JJ significant) (BASENP (JJ explosive) (NN event))) (DQR ''))) (VP (VBD had) (VP (VBN occurred) (PP (IN at) (NP (BASENP (NNP Mount) (NNP Redoubt)) (PP (IN in) (BASENP (NNP Alaska))))))))))) (PERIOD .))