(S (S (BASENP (PRP It)) (VP (VBZ is) (VP (VBN expected) (SBAR (IN that) (S (BASENP (DT this) (NN incident)) (VP (VBZ is) (NP (BASENP (RB only) (DT the) (NN beginning)) (PP (IN of) (NP (BASENP (DT a) (JJ large) (JJ eruptive) (NN process)) (COMMA ,) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB result) (PP (IN in) (NP (BASENP (DT a) (NN catastrophe)) (PP (IN for) (BASENP (NNP El) (NNP Salvador)))))))))))))))))) (PERIOD .))