( ( ( Tsunamis , ) ( which ( can ( be ( triggered ( ( ( by ( earthquake-induced ( underwater landslides ) ) ) or ) ( by ( surface ( faulting that ) ) ) ) ) ) ) ) ) ( ( occurs ( on ( ( the floor ) ( of ( the ocean ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Tsunamis)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD can) (VP (VB be) (VP (VBN triggered) (PP (PP (IN by) (NP (JJ earthquake-induced) (JJ underwater) (NNS landslides))) (CC or) (PP (IN by) (NP (NP (NN surface)) (VP (VBG faulting) (NP (DT that)))))))))))) (VP (VBZ occurs) (PP (IN on) (NP (NP (DT the) (NN floor)) (PP (IN of) (NP (DT the) (NN ocean)))))) (. .)))
Tsunamis, which can be triggered by earthquake-induced underwater landslides or by surface faulting that occurs on the floor of the ocean.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN underwater) (NN earthquake)) (VP (VBZ creates) (NP (DT a) (NN tsunami))) (. .)))