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. 2018 Mar 27;18(4):997. doi: 10.3390/s18040997

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© 2018 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Relationship between elastic wave velocity against volumetric water content and tilt angle by varied model tests with surface layer thickness of (a) 5 cm, (b) 10 cm and (c) 15 cm.

Relationship between elastic wave velocity against volumetric water content and tilt angle by varied model tests with surface layer thickness of (a) 5 cm, (b) 10 cm and (c) 15 cm.