( ( 6 earthquake ) ( ( occurred ( in ( the ( Gorda plate ) ) ) ) . ) )
(ROOT (S (NP (CD 6) (NN earthquake)) (VP (VBD occurred) (PP (IN in) (NP (DT the) (NNP Gorda) (NN plate)))) (. .)))
6 earthquake occurred in the Gorda plate .
(ROOT (S (NP (NP (CD Two) (NNS plates)) (VP (VBG sliding))) (VP (MD can) (VP (VB increase) (NP (NP (DT the) (NN occurance)) (PP (IN of) (NP (NNS earthquakes)))))) (. .)))