( ( Tsunami 's ) ( ( ( can also ) ( ( ( ( be ( generated ( by ( ( submarine landslides ) ( -LRB- ( ( that ( may ( be ( triggered ( by earthquakes ) ) ) ) ) -RRB- ) ) ) ) ) ) , ) or ) ( underwater ( volcanic eruptions ) ) ) ) . ) )
(ROOT (S (NP (NNP Tsunami) (POS 's)) (VP (MD can) (ADVP (RB also)) (VP (VP (VB be) (VP (VBN generated) (PP (IN by) (NP (NP (JJ submarine) (NNS landslides)) (PRN (-LRB- -LRB-) (SBAR (WHNP (WDT that)) (S (VP (MD may) (VP (VB be) (VP (VBN triggered) (PP (IN by) (NP (NNS earthquakes)))))))) (-RRB- -RRB-)))))) (, ,) (CC or) (VP (VB underwater) (NP (JJ volcanic) (NNS eruptions))))) (. .)))
Tsunami's can also be generated by submarine landslides (that may be triggered by earthquakes), or underwater volcanic eruptions.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN underwater) (NN earthquake)) (VP (VBZ creates) (NP (DT a) (NN tsunami))) (. .)))