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Earthquake hazards on the cascadia subduction zone
Science (New York, N.Y.)
|April 10, 1987
Summary
Large subduction earthquakes in the Cascadia region pose a significant seismic hazard. These events could generate powerful ground shaking and local tsunamis across the Pacific Northwest.
Area of Science:
- Geophysics
- Seismology
- Tectonics
Background:
- The Cascadia subduction zone poses a seismic hazard due to the subduction of young oceanic lithosphere beneath North America.
- It shares geological similarities with other subduction zones that have experienced large earthquakes (Mw 8-9.5).
Purpose of the Study:
- To assess the potential seismic hazard of large subduction earthquakes in the Cascadia region.
- To estimate the ground motion and potential tsunami risk associated with such events.
Main Methods:
- Comparison of Cascadia with similar subduction zones globally.
- Analysis of earthquake energy magnitudes (Mw).
- Simple simulations to estimate strong ground motions for large earthquakes (up to Mw 9.5).
Main Results:
- Cascadia's subduction characteristics suggest potential for great (Mw 8) or giant (Mw 9) earthquakes.
- Strong ground shaking is expected over a large region if large subduction earthquakes occur.
- Large local tsunamis may accompany these earthquakes.
Conclusions:
- The Cascadia subduction zone is capable of producing large-magnitude earthquakes.
- Significant seismic and tsunami hazards exist for the Pacific Northwest.
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