| 21. | This is in common with other types of surface waves.
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| 22. | The phases of an ocean surface wave : 1.
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| 23. | It is for this reason that internal waves move in slow-motion relative to surface waves.
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| 24. | These surface waves are called " action waves ".
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| 25. | In 1947, the Dutch astronomer Hendrik van de Hulst suggested that surface waves are involved.
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| 26. | In addition to this there is a surface wave.
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| 27. | Physically, seismic noise consists mostly of surface waves.
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| 28. | Deep-focus earthquakes give rise to minimal surface waves.
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| 29. | Breaking of water surface waves may occur anywhere that the amplitude is sufficient, including in mid-ocean.
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| 30. | The earthquake had an estimated magnitude of 7.2 ?0.3 on the surface wave magnitude scale.
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