The scientific evidence found to support the idea that the last great Cascadia Subduction Zone earthquake
1.The Cascadia region faces a “seismic triple threat.” What do geologists mean by
this statement?
2. What are the specific sources of this threat?
3. Scientists in the 1980’s were unsure if the Cascadia Subduction Zone (CSZ) was
active and could produce large “super” earthquakes. What were the 2 conflicting
theories about earthquake occurrence in the CSZ? Circle the one that was found to
be correct
4. Describe the the main piece of scientific evidence found to determine which of the
theories was correct.
5. What was the scientific evidence found to support the idea that the last great
Cascadia Subduction Zone earthquake occurred about 315 years ago (in 1700 AD).
Answer preview to the scientific evidence found to support the idea that the last great Cascadia Subduction Zone earthquake
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