tsunamis-how do scientist detech them?

Question

how do scientists detech tsunami's arrival time

Answer 1

computor projections based on the waves and the distance

but usully the people detect them when it hits them and they have a few minutes because they see it coming

Answer 2

tsunamis are usually followed by under water earth quakes or volcanic activity... if scientists pick up a large earth quake underwater they will know there is a possibly of a tsunami radiating from the area of the quake center... the most obvious way to tell of an approaching tsunami is along the beach coast there will be a massive recession of water into the sea... but usually by then not much time would be left before the wave strikes..

Answer 3

Tsunamis travel across the ocean floor undetected on the surface until they get close to land. There are sensors strategically placed on the ocean floors in areas susceptible to tsunamis. These sensors communicate with a transmitter floating on the surface which then transmits important data about water movement on the ocean floor back to land monitoring stations.

While the system is effective in concept, there are far too few sensors/transmitters to cover all populated areas. Plans are in place to expand the system but this will require funding.

Answer 4

The speed of a tsunami depends on ocean depth; the formula is v=gk tanh kh where v is the velocity in m/s, k is the wave number (google this) and h is ocean depth in metres. Ask your maths teacher what tanh is. So in deep water tsunamis move faster than in shallow coastal water, where they slow down, pile up, and cause damage. Here in NZ where we're at risk of tsunamis from geologically-active Pacific Rim places like Alaska, Japan, Chile and Tonga, you can buy a tsunami arrival time map from our Dept. of Geological and Nuclear Sciences in Wellington. Google them. It was prepared by somebody looking at ocean depths, adding up the variable speed of a tsunami as it travels through water of various depths, and drawing lines to exposed places on NZs coastline from various places. For instance, it takes about 14 hours for a tsunami generated by the 1964 Alaska quake to reach us. Google tsunameter. It's an automatic instrument consisting of a pressure sensor on the ocean floor connected by cable to a buoy on the surface. When a tsunami passes overhead, the pressure slightly increases, an electric signal goes to the buoy and a radio alert goes to the tsunami warning HQ in Hawaii.

Answer 5

tsunamis are generally caused by either an earth quake or a volcano usually scientist detect them by observing local oceanic currents after a shock wave is detected they then calculate the speed of travel by comparing with known data

Answer 6

there is no way discovered by scientists to determine a tnsunami. but animals like elephants can detect them as they have special bones in their feet . tnsunami can be detected by obsreving the behaviour of the ocean .