Earth Physical Geology
Quiz 10: Earthquakes and Earth's Interior
The Cascadia Subduction Zone Is Typical in Its Earthquake Activity
The Cascadia Subduction Zone is typical in its earthquake activity for most young subduction zones.
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As determined by dated sedimentary evidence in west coast marshes, there have been at least 13 great "Megathrust" earthquakes on the Cascadia Subduction Zone during the past 6000 years.
Earthquake intensity is a measure of damage related to shaking and not the energy released.
The Mercalli earthquake intensity scale uses Roman numerals from I to XII, XII being the highest intensity.
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