You are steaming in the open ocean of the North Pacific between the Aleutian Chain and Hawaii. A warning broadcast indicates that an earthquake has occurred in the Aleutians and has generated a tsunami that is predicted to hit Hawaii. What action is necessary for the ship's safety?
• Characteristics of tsunamis in deep/open ocean (wave height vs. wavelength and speed) • Difference between ship handling in deep water vs. near the coast for tsunami risk • What physical effects a passing tsunami would realistically have on a vessel in deep water
• Think about what a tsunami looks and feels like in deep water far from shore. Would the crew even notice it? • Which choices describe effects that are more typical of storms or normal sea states, rather than tsunamis? • If you are between the source and the coast (not at the coast), which option best reflects the actual hazard level to your vessel?
• Verify how tsunami wave height and period change from deep ocean to shallow coastal water. • Check which options suggest preparing for breaking seas or extreme rolling, and ask whether this matches deep-ocean tsunami behavior. • Confirm whether ships in the open ocean are usually advised to take special avoidance maneuvers or mainly maintain normal safe operations when a tsunami passes under them.
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