(S (BASENP (NN Six) (JJ other) (NNS workers)) (VP (VBD were) (VP (VBN injured) (PP (IN in) (SBAR (WHNP (WP what)) (S (VP (VBZ is) (VP (VBG being) (VP (VBN called) (S (NP (DT a) (NP (JJ seismic) (QT (DQL ``) (QTC (BASENP (NN bump)) (PERIOD .)) (DQR ''))))))))))))))