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. 2015 Dec 8;5:17865. doi: 10.1038/srep17865

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(a) f = 25.8 MHz, below the attenuation zones, (b) f = 79.8 MHz, within region I, (c) f = 127.4 MHz, within region II and (d) f = 236.2 MHz, within region III. The total displacement is calculated as the magnitude of overall displacement vector with horizontal and vertical components at each material point.