Write an inquisitive question about a specific text span in a given sentence such that the answer is not in the text.

Let me give you an example: Sentence: The Obama administration is developing additional screening protocols for airline passengers both overseas and in the United States to control infectious diseases such as Ebola, President Barack Obama said Monday .<sep>Span: Obama administration
The answer to this example can be: What was the duration of the Obama administration?
Here is why: It is an inquisitive question based on the specific span of the sentence.

OK. solve this:
Sentence: Scientists last year published this grim scenario for a massive rupture along the Cascadia fault system , which runs 700 miles off shore from Northern California to Vancouver Island .<sep>Span: Scientists
Answer:
Which scientists?