( Thus ( , ( earthquakes ( ( occur ( as ( thrust ( ( ( faulting ( on ( ( the interface ) ( between ( the ( two plates ) ) ) ) ) ) , ) ( with ( ( the ( South ( American Plate ) ) ) ( moving ( towards ( ( the sea ) ( over ( the ( Nazca Plate ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Thus)) (, ,) (NP (NNS earthquakes)) (VP (VBP occur) (PP (IN as) (NP (NP (NN thrust)) (VP (VBG faulting) (PP (IN on) (NP (NP (DT the) (NN interface)) (PP (IN between) (NP (DT the) (CD two) (NNS plates))))) (, ,) (PP (IN with) (NP (NP (DT the) (NNP South) (NNP American) (NNP Plate)) (VP (VBG moving) (PP (IN towards) (NP (NP (DT the) (NN sea)) (PP (IN over) (NP (DT the) (NNP Nazca) (NNP Plate)))))))))))) (. .)))
Thus, earthquakes occur as thrust faulting on the interface between the two plates, with the South American Plate moving towards the sea over the Nazca 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)))))) (. .)))