Assertion: wave's speed | /r/HasProperty | the order of 2–5 km/s
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Source sentences:
text: The typical speed of Rayleigh waves in metals is of the order of 2–5 km/s, and the typical Rayleigh speed in the ground is of the order of 50–300 m/s for shallow waves less than 100-m depth and 1.5-4 km/s at depths greater than 1 km.