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the claim

At the Mendocino Triple Junction, the Pacific Plate slides northwestward along the North American Plate.

the verdict
SUPPORTED
the evidence backs this
Recorded sources
4 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that at the Mendocino Triple Junction, the Pacific Plate slides northwestward along the North American Plate?

Yes. Geological and geodetic studies confirm that at the Mendocino Triple Junction, the Pacific Plate moves northwestward relative to the North American Plate along the San Andreas fault system.

Verdict: SUPPORTED · 4 sources for, 0 against · Last checked

Evidence for · 4
Pacific–North American Plate Motion from very long baseline interferometry compared with motion inferred from magnetic anomalies, transform faults, and earthquake slip vectors
1990
Deals with geodetic and magnetic anomaly measurements of Pacific-North America plate motion along faults including California.
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Argus, D. F. & Gordon, R. G. (1990). Pacific–North American Plate Motion from very long baseline interferometry compared with motion inferred from magnetic anomalies, transform faults, and earthquake slip vectors. doi.org. https://doi.org/10.1029/jb095ib11p17315

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More for · 3
Upper plate contraction north of the migrating Mendocino triple junction, northern California: Implications for partitioning of strain
2000
Discusses the Mendocino triple junction where the San Andreas and Cascadia limbs meet, involving the Pacific plate and North American plate.
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McCrory, P. A. (2000). Upper plate contraction north of the migrating Mendocino triple junction, northern California: Implications for partitioning of strain. doi.org. https://doi.org/10.1029/1999tc001177

Zoogeography of the San Andreas Fault system: Great Pacific Fracture Zones correspond with spatially concordant phylogeographic boundaries in western North America.
2016
Examines zoogeographic and tectonic boundaries along the San Andreas Fault system with a focus on Cape Mendocino and triple junction evolution.
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AD, G. (2016). Zoogeography of the San Andreas Fault system: Great Pacific Fracture Zones correspond with spatially concordant phylogeographic boundaries in western North America.. doi.org. https://doi.org/10.1111/brv.12167

Transient Deformation in California From Two Decades of GPS Displacements: Implications for a Three-Dimensional Kinematic Reference Frame.
2019
Analyzes GPS displacements from the Mendocino Triple Junction down to Southern California to study tectonic reference frames and secular motion.
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E, K., Y, B., X, X., DT, S., D, G., P, F., & L, S. (2019). Transient Deformation in California From Two Decades of GPS Displacements: Implications for a Three-Dimensional Kinematic Reference Frame.. doi.org. https://doi.org/10.1029/2018jb017201

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