Many people acted heroically in the aftermath of Hurricane Katrina. The Coast Guard, for instance, rescued some 34,000 people in New Orleans alone, and many ordinary citizens commandeered boats, offered food and shelter, and did whatever else they could to help their neighbors.
Tidal waves, or tides, are a predictable, com-mon occurrence along coastal communities, generated by forces beyond Earthâthe gravitational pull of the sun and moon. However, tsunamis are not predictable. They are often generated by earth-quakes, volcanic activity, and slope failure.idal waves, or tides, are a predictable, com-mon occurrence along coastal communities, generated by forces beyond Earthâthe gravitational pull of the sun and moon. However, tsunamis are not predictable. They are often generated by earth-quakes, volcanic activity, and slope failure.
Generally the danger of a tsunami occurring exists where earth-and lake-quakes are possible, in areas where tectonic plates collide with each other, drift past each other or collide, as well as in other areas with geological faults. Mostly beaches and coastlines are affected by tsunamis.sunamis arise from the sudden displacement of gigantic water masses due to earthquakes on the seabed, volcanic eruptions above and under water, landslides or meteorite impacts. About 86 % of all Tsunamis result from so-called seaquakes.