( ( These ( two earthquakes ) ) ( ( occurred ( in ( two ( different plates ) ) ) ) . ) )
(ROOT (S (NP (DT These) (CD two) (NNS earthquakes)) (VP (VBD occurred) (PP (IN in) (NP (CD two) (JJ different) (NNS plates)))) (. .)))
These two earthquakes occurred in two different plates.
(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)))))) (. .)))