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§Reefs,
bays, entrances to rivers, undersea features and the slope of the beach
all help to modify the tsunami as it approaches the shore.
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§Tsunamis
rarely become great, towering breaking waves.
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§Sometimes
the tsunami may break far offshore, or it may form into a bore: a
step-like wave with a steep breaking front. A bore can happen if the
tsunami moves from deep water into a shallow bay or river.
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