Kathirkaman My question is how the main verb "is" (present simple) in the main clause affects the verbs "occurring" (present continuous) and "has occurred" (present perfect) in the subordinate clauses. In this case, the verb in the main clause does not affect the interpretation of the verb tenses in the subordinate clause. If the result is greater or less than 1, then this is an indication of tectonic influence occurring in the area.
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KathirkamanMy question is how the main verb "is" (present simple) in the main clause affects the verbs "occurring" (present continuous) and "has occurred" (present perfect) in the subordinate clauses.In this case, the verb in the main clause does not affect the interpretation of the verb tenses in the subordinate clause.