tsunami presentation

Sustainable Schools 4 Sustainable Europe World Tsunami Awareness Day 5th NOVEMBER 2020



GOAL 14



The term “tsunami” Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Tsunami is a Japanese word with the English translation, \"harbor wave.\" Represented by two characters, the top character, \"tsu,\" means harbor, while the bottom character, \"nami,\" means \"wave.\" Orestis F. GREECE

What is a tsunami ? Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea. Out in the depths of the ocean, tsunami waves do not dramatically increase in height. But as the waves travel inland, they build up to higher and higher heights as the depth of the ocean decreases. The speed of tsunami waves depends on ocean depth rather than the distance from the source of the wave. tJohn Ts. GREECE

What do tsunami waves look like? Tsunami waves do not resemble normal undersea currents or sea waves because their wavelength is far longer. Rather than appearing as a breaking wave, a tsunami may instead initially resemble a rapidly rising tide. For this reason, it is often referred to as a tidal wave, Tsunamis generally consist of a series of waves, with periods ranging from minutes to hours, arriving in a so-called \"wave train\". Wave heights of tens of metres can be generated by large events. Although the impact of tsunamis is limited to coastal areas, their destructive power can be enormous, and they can affect entire ocean basins. Alex R. GREECE

How is a tsunami formed? A tsunami is a series of great sea waves caused by an underwater earthquake, landslide, or volcanic eruption. More rarely, a tsunami can be generated by a giant meteor impact with the ocean. D Jim St. GREECE

SPEED OF A TSUNAMI About 200 m/s Tsunami wave speed will average about 200 m/s or over 700 km/h (500 mph). HOW DO TSUNAMIS TRAVEL SO FAST. Tsunamis travel fast because they have a very long wavelength compared to wind-driven water waves. Tsunamis originate when the entire column of water above the seafloor is uplifted or dropped down. Unlike wind waves, they are driven by gravity.

9u CAUSES OF TSUNAMIS earthquakes By far, the most destructive tsunamis are generated from large, shallow earthquakes with an epicenter or fault line near or on the ocean floor. These usually occur in regions of the earth characterized by tectonic subduction along tectonic plate boundaries. The high seismicity of such regions is caused by the collision of tectonic plates. When these plates move past each other, they cause large earthquakes, which displace large areas of the ocean floor from a few kilometers to as much as a 1,000 km or more. The sudden vertical displacements over such large areas, disturb the ocean's surface, displace water, and generate destructive tsunami waves. JOHN GREECE

CAUSES OF TSUNAMIS landslides Tsunamis are large, potentially They can also result from the deadly and destructive sea eruption or collapse of island waves, most of which are or coastal volcanoes and formed as a result of submarine from giant landslides on earthquakes marine margins. Why study landslides? Landslides are a serious geologic hazard common to almost every State A landslide is defined as the movement of a mass of rock, debris, or earth down a slope. Earthquake shaking and other factors can also induce landslides underwater. These landslides are called submarine landslides. Submarine landslides sometimes cause tsunamis that damage coastal areas.

CAUSES OF TSUNAMIS volcanic eruptions This sudden motion could be an earthquake a powerful volcanic eruption or an underwater landslide.Volcanic eruption causes tsunamis via seismic energy. Andrew GREECE

What happens before a tsunami The Signs of a tsunami: A noticeable rapid rise or fall of coastal waters. Coastal water making unusual noise. The noise may sounds like an approaching train, plane, or whistling. Following an earthquake, move quickly to higher ground away from the coast. In case of a tsunami warning, be prepared ready to evacuate at a moment’s notice. Follow posted evacuation routes, where present. Take your animals with you but do not delay your evacuation to collect them. A tsunami is a series of waves that can continue for hours and the next waves may be larger than earlier ones. Do not assume that after one wave, the danger is over. If you cannot evacuate to higher ground, evacuate vertically to a higher floor, onto a roof, up a tree, or grab a floating object. If you are at sea, stay there. Boats are generally safer in water deeper than 20 metres. Watching a tsunami could put you in grave danger. If you can see the wave, you are too close to escape it.

History of World Tsunami Day 2020 In December 2015, the United Nations General Assembly designated 5 November as World Tsunami Awareness Day to promote a global culture of tsunami awareness.World Tsunami Awareness Day encourages the development of national and community-level, local disaster risk reduction strategies to save more lives against disasters.

Intergovernmental Oceanographic Commission (IOC) of UNESCO Since it was established in 1960 the Intergovernmental Oceanographic Commission of UNESCO (IOC) is the United Nations body responsible for supporting global ocean science and services. The IOC enables its 150 Member States to work together to protect the health of our shared ocean by coordinating programmes in areas such as ocean observations, tsunami warnings and marine spatial planning. The IOC is now focusing on Nations bodies that are working to understand and improve the management of our oceans, coasts and marine ecosystems.

World Tsunami Day Theme 2020 World Tsunami Awareness Day 2020: It is observed on 5 November every year to promote national and local risk reduction plans. According to the UN, by 2030, an estimated 50 percent of the world's population will live in coastal areas exposed to flooding, storms, and tsunamis. Tsunamis are rare events but can be extremely deadly therefore proper plans and policies will help to reduce the tsunami impact and help to build more resilience and protect populations at risk. This year’s observance promotes the \"Sendai Seven Campaign,” target (e). This theme focuses on reducing disaster damage to critical infrastructure and the disruption of basic services. The United Nations wants to increase the use of early warning systems, resilient infrastructure, educate people to save and protect their assets against tsunami risk in the future.

Worst Hit Tsunami in History As the years pass we have seen more and more powerful tsunamis hitting locations all around the world but there is one that really differs from the other ones… At the just early rise of the sun in 26 December of 2004 a massive tsunami, 33 meters high which occured because of an earthquake at the indonesian sea with moment magnitude 9,1-9,3 struck an area bigger than 1000 kilometers. It caused an estimated 2.27 lac deaths in 14 countries including India, Sri Lanka, Thailand, and Indonesia.

Latest Hit of Tsunami in 2020 On the 30th of October 2020, a magnitude 7.0 earthquake triggered a minor tsunami which inundated the Greek islands of Ikaria, Kos, Chios and Samos amongst various other islands and costal areas of Greece and Turkey. Orestis Fytros

Worst Hit Tsunami in History It was 2004, the day after Christmas, and thousands of European and American tourists had flocked to the beaches of Thailand, Sri Lanka and Indonesia to escape the winter chill in a tropical paradise. At 7:59 AM, a 9.1-magnitude earthquake—one of the largest ever recorded—ripped through an undersea fault in the Indian Ocean, propelling a massive column of water toward unsuspecting shores. The Boxing Day tsunami would be the deadliest in recorded history, taking a staggering 230,000 lives in a matter of hours.

DO’S during a tsunami Turn on your radio to learn if there is tsunami warning if an earthquake occurs and you are in a coastal area. Be alert for early warning. If you ar.e in dangerous area, immediately turn all the water gas and electricity and quickly move to a higher ground. Remember once tsunami warning is issued, it could be a matter of minutes, or even seconds, before the wave’s hits. If tsunami warning is issued, never go down to the beach to watch the waves come in. Listen to the radio to learn when its safe to return home. Stay away from the beach. Learn to understand and notice the sea. If there is noticeable recession in water away from the shore time become caution and move away immediately.. Move inland to higher ground immediately and stay there.

DON’TS during a tsunami Do not stay in low-lying coastal areas after a strong earthquake has been felt. Do not wait for all of the natural warning signs (strong shaking, withdrawal of the sea, strange roar of the sea) to occur before leaving the beach. Do not wait for an official warning before evacuating; authorities may not have enough time to issue a Tsunami Warning. If a Tsunami Warning is issued, NEVER go down to the beach to watch the waves come in. Do not try to surf the tsunami.

DON’TS during a tsunami If you are on a vessel in deep water and a tsunami warning has been issued, do not return to port. Vessels are safer from tsunami damage whilst in the deep ocean (>200 fathoms, 1200 ft, 400 m). If you own a boat, do not risk your life and attempt to motor it into deep water if it is too close to wave arrival time. Anticipate slowdowns caused by traffic gridlock and hundreds of other boaters heading out to sea. Do not return to the beach until an “all-clear” is issued by a recognized authority e.g. your local disaster management office.

This presentation was made by the students of Arsakeia Tositseia Schools in GREECE. So now are you ready to play a quizizz to test your knowledge?