Sometimes, the waves hit in succession -- often the highest not being the first, CNN meteorologist Ivan Cabrera said.

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Pain can sometimes come in waves with nausea and vomiting.

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Also, since radio waves sometimes arrive at your device not directly from the radio tower but rather by being bounced off a building or hill, these signals may be much lower in signal strength than if you had a clear line of sight view to the cell site.

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No tsunami warning was issued, but the Pacific Tsunami Warning Center said a quake this strong could sometimes generate local tsunami waves within 100km of the epicentre.

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Sometimes, however, these waves become horribly distorted and make the heart beat erratically, a condition called cardiac fibrillation.

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Sometimes bipolar can feel a little like living on a beach, permanently, with waves of unbearable emotion and panic washing over me.

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The framework on which this is all hung is a historical look at the expansion of surfing from its roots in Hawaii, and exactly how and why it spread to certain sometimes bizarre places, always eliciting passion along the way, like river surfing from dam generated waves in Germany to Cuba, Japan and the Middle East.

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