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Where one would expect that the Hawaiian Islands would be awash with tidal waves and under the threat of nearby volcanic eruptions, there is a bright spot for these islanders in that the Pacific will be shortening, tightening, and all shores that represent plates above subducting plates will benefit from this. During the rotation stoppage, the waters of the Pacific will flow towards the poles, and during the shift will rush from one side of the Pacific to the next. However, due to the shortening of the Pacific, there will be slightly more water to deal with overall. The highest altitudes will be the safest, with a tie-down to survive the hurricane force winds. Due to proximity to the oceans bounty afterwards, the volcanic gloom can be offset.
Tidal bore is present when the water has no where to go but up. This happens when a large wave approaches a cliff, along a land mass that prevent the water from any escape. For instance, along the western coast of Peru. Water then must either push sideways, encountering water under just as much pressure, or back, likewise not possible given the press. Thus, the least resistance is up a ravine. In the case of islands like those in Hawaii, there is wiggle room. Even though the islands are large, the wave approaching the island starts to move around the island long before it starts rolling up the land mass toward the beaches. The water on either side of the island has a lot of options, can move sideways, and does so. Thus, the advise to move inland x miles and upland x feet is not that far afield. Clearly, one should move as high as possible, staying out of the hurricane force winds, and not hang about near the beaches even if on high ground.
ZetaTalk