Sentence:The scale of such landslides on natural slopes can be large enough to devastate entire villages or towns, such as the Huascaran Avalanche triggered by the Peru earthquake (1970, Mw = 7.8), or the complex [e1]slides[/e1] caused by the Alaska [e2]earthquake[/e2] in 1964 (Ms = 8.4).
 e1: slides. 
 e2 : earthquake.
Answer: Cause-Effect(e2,e1)