There Have Been No Observed Megathrust Earthquakes on the Cascadia

question 17

Multiple Choice

There have been no observed megathrust earthquakes on the Cascadia Subduction Zone since the year 1700 because _________________.

• A) subduction has ceased
• B) the plates slip aseismically past each other
• C) the fault is currently locked
• D) our seismographs aren't sensitive enough

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