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the claim

The San Andreas fault is nearly vertical

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 the San Andreas fault is nearly vertical?

Yes. Geophysical studies including seismic imaging, magnetotelluric sounding, and gravity modeling demonstrate that segments of the San Andreas Fault are indeed nearly vertical or steeply dipping in the upper crust.

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

The analysis

The retrieved literature consistently supports the claim that the San Andreas fault is nearly vertical or steeply dipping. Papers [0], [3], [9], and [11] all explicitly report geophysical evidence (such as seismic tomography, geodetic and seismic inversions, magnetotelluric imaging, and gravity models) showing that the fault or key sections of it (like the southern San Andreas fault) are vertical to steeply dipping (e.g., 60-80 degrees) in the upper crust. No papers refute the claim, so the verdict is SUPPORTED.

Evidence for · 4
San Andreas Fault dip, Peninsular Ranges mafic lower crust and partial melt in the Salton Trough, Southern California, from ambient‐noise tomography
2015
Ambient-noise tomography reveals vertical to steeply dipping lateral velocity contrasts across the San Andreas Fault.
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Barak, S., Klemperer, S., & Lawrence, J. (2015). San Andreas Fault dip, Peninsular Ranges mafic lower crust and partial melt in the Salton Trough, Southern California, from ambient‐noise tomography. doi.org. https://doi.org/10.1002/2015GC005970

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More for · 3
Active Dipping Interface of the Southern San Andreas Fault Revealed by Space Geodetic and Seismic Imaging
2023
Data inversions show the southern San Andreas Fault dips to the northeast at 60-80 degrees in the upper crust.
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Vavra, E. J., Qiu, H., Chi, B., Share, P., Allam, A., Morzfeld, M., Vernon, F., Ben‐Zion, Y., & Fialko, Y. (2023). Active Dipping Interface of the Southern San Andreas Fault Revealed by Space Geodetic and Seismic Imaging. doi.org. https://doi.org/10.1029/2023JB026811

Structural properties of the Southern San Andreas fault zone in northern Coachella Valley from magnetotelluric imaging
2022
Magnetotelluric imaging highlights a vertical to steeply northeast dipping fault zone in the upper crust.
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Share, P., Peacock, J., Constable, S., Vernon, F., & Wang, S. (2022). Structural properties of the Southern San Andreas fault zone in northern Coachella Valley from magnetotelluric imaging. doi.org. https://doi.org/10.1093/gji/ggac356

Insights into the geometry and evolution of the southern San Andreas fault from geophysical data, southern California
2022
Gravity and magnetic models provide evidence for a steep northeast dip of the San Andreas fault strands.
Get citation
Langenheim, V. & Fuis, G. (2022). Insights into the geometry and evolution of the southern San Andreas fault from geophysical data, southern California. doi.org. https://doi.org/10.1130/ges02378.1

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Receipt History
first checked05 Aug 2026
judged → SUPPORTED · 8605 Aug 2026
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