2. What are tidal waves? How is tsunami different from tides? Explain.
ज्वारीय तरंगें क्या होती हैं? सुनामी ज्वार से कैसे अलग है? समझाएं।
A tidal wave is a regularly reoccurring shallow water wave caused by effects of the gravitational interactions between the Sun, Moon, and Earth on the ocean. It is primarily affected by the Earth’s rotation
[Note – The term “tidal wave” is often used to refer to tsunamis; however, this reference is incorrect as tsunamis have nothing to do with tides.]
Difference between a tsunami and a tidal wave
Although both are sea waves, a tsunami and a tidal wave are two different and unrelated phenomena. A tidal wave is a shallow water wave caused by the gravitational interactions between the Sun, Moon, and Earth.
Tsunamis is an ocean wave triggered by large earthquakes that occur near or under the ocean, volcanic eruptions, submarine landslides, or by onshore landslides in which large volumes of debris fall into the water.
- Tsunami originate in deep sea under impact of crustal movement
- Tide originate on surface of water under impact of gravity of moon and the sun
- Tsunami travel at high speed in deep sea
- Tides are comparatively slower
- Tsunami become gant wave on reaching the shore
- Tides may become big but not as big as Tsunami
- Tsunami usually leads to destruction and disaster along coastline
- Tides can be harnessed to create energy, transportation for inland ports etc
- Tsunami are non-frequent
- Tides are frequent and can be predicted on basis of position of moon and sun I.e spring tide and neap tide.
- Tsunami orginates at bottom of ocean floor as a result of volcano, landslide or tectonic plate movement
Tsunami safeguard measure like early warning system, standardised operation protocol, capacity building for rapid deployment of navy and NDRF personnel etc have been developed in the wake of Chennai Tsunami disaster.
Besides this govt. should also implement the regulations suggested under Hyogo protocol to further reduce the loss caused by Tsunami related disaster in future.