Underwater dunes caused by Japan tsunami

I had a discussion that sand that has been deposited under water cannot have slopes steeper than 25 degrees, so that steep sand slopes (35 degrees) show that a deposition is eolic. The Japan Tsunami refutes that statement:

1-s2.0-S0025322712002782-gr3

(source: http://www.sciencedirect.com/science/article/pii/S0025322712002782 )

Scaled to 1:1 shows that the maximum slope of the under water dunes is 45 degrees:

under water dunes maximum slope

Conclusion: steep sand slopes are either formed by wind or by tsunami.

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About Geodetective

I am an expert in 3D design/visualizing, programming and data analysis and an amateur scientist who has developed a method for truth investigation. I primarily focus on geophysics, but investigate geology and astronomy as well because they are closely related.
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