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Most tsunamis are caused by earthquakes on converging tectonic plate boundaries.  However, tsunamis can also be caused by landslides, volcanic activity, certain types of weather, and possibly near-earth objects like asteroids, comets. Colliding with or exploding above the ocean.

An earthquake is caused by a sudden slip on a fault.  When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel. In California, there are two plates - the Pacific Plate and the North American Plate.
Hi Hayley, hope you are well at home. This is a great post with some good info and the image really shows the size of the wave. Well done!

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Tsunamis are a series of long waves that result from an earthquake under water. They can reach speeds up to 500 miles an hour, faster than a jet. The largest recorded tsunami happened on the 26 of December in 2004, located in a Sumatra, Indonesia. It was 15- 30 meters tall until it could reach a max of over 50 meters tall! It had an approximate death count of 227 898 deaths and the damage cost 15 billion USD or 20 432 910 000 Australian Dollars! But it isn't the worst tsunami ever, there are still more tsunamis with bigger statistics than these.
To escape a tsunami, stay away from windows and things that can crush you. Seek high ground and if you are out at see boat out far into the ocean and remember where you came from.
Great gif, Abi! Poor cat on a surf board riding on a tsunami wave! You found some good information too!

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Do you now what this is ? It a tsunami. A tsunamis are big waves  that can travel really long distances  and sometimes even make to land. In 2009 a tsunami hit Indonesia a while as Africa  and 12 other countries .It was caused by a earthquake under the water .If you see a tsunami head for higher ground so that YOU don't get caught in one.
Great image, lovely typing, just one thing needed, your name so I know who did this great work!

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A tsunami is a series of long waves generated by a large and sudden displacement of the ocean. Large earthquakes below or near the ocean floor are the most common cause, but landslides, volcanic activity, certain types of weather, and near earth objects. Asteroids and comets can also cause a tsunami.
An excellent explanation of the causes of a tsunami. Well done Lara!

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A tsunami is a series of ocean waves caused by an underwater earthquake, landslide, or volcanic eruption.

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what is an earthquake?
An earthquake is when the vibration travels through the earths crust. They are unpredictable. Earthquakes occur when two tectonic plates slip or fault against each other. Every day earthquakes occur but they are to little for us to feel them.  They are measured in the Richter scale which is a scale from one to ten. Anything higher than 7 means the earthquake  will be big.
You are right Patrick. If the earthquake is higher than 7 on the Richter Scale it will be BIG and cause a lot of damage. Great information and a great picture to show the damage an earthquake can cause.

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Most tsunamis are caused by earthquakes on converging tectonic plate boundries. However, tsunamis can also be caused by landslides, volcanic activity and certain types of weather. Tsunamis are detected and measured by coastal  tide gages and by tsunami buoys in the deep ocean. The tides gages measure the tsunami wave directly. Tsunamis not only destroy human life, but have a effect on insects, animals, plants and natural resources. A tsunami changes the landscape. I you see a tsunami in the distant try and get as far away as possible and try to get the high ground
Good info, Lucas. That is one big wave in you picture!

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Earthquakes are caused when the tectonic plates under the earths crust move and rub against each other.
Your picture really shows how much damage an earthquake can cause. Thanks Zac!

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Tsunamis are caused by an under water earthquake, landslide or volcanic eruption that creates a series of waves. Tsunamis are known to destroy entire towns and you should never be in the way of one. They can sometimes be created from meteors falling but it is extremely rare.
You are right about the meteor thing ... no one else said that. Clever cookie!

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Earthquakes and tsunamis are caused by the movement of tectonic plates . Earthquakes can cause fires, floods, and volcanic eruptions as well as damage to structures and the environment. Tsunamis can cause mass destruction, flooding towns and destroying everything in its path. Earthquakes are recorded by instruments called seismographs. When there is an earthquake, you should take cover if you are indoors and stay away from windows. If you are outside, you should get to an open area away from buildings and structures. When there is a tsunami you should get to high ground. The relationship between earthquakes and tsunamis is that they are both caused by the movement of tectonic plates.
Great post Bryce, with lots of information to keep us safe in a tsunami! Good boy...

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Earthquakes are very dangerous and cause when tectonic plates move in the ground.
Your picture says it all I am so pleased you posted in your own words instead of cutting and pasting.

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I hope you enjoy this PS don't copyright!
Excellent information Professor Mitchell! Well researched indeed!

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Very detailed. Watch it. - Mrs Sim

𝘠𝘦𝘴, 𝘷𝘦𝘳𝘺 𝘨𝘰𝘰𝘥. 𝘞𝘪𝘭𝘭 𝘸𝘢𝘵𝘤𝘩. - 𝘚𝘵𝘳𝘢𝘯𝘨𝘦𝘳

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Earthquakes - Countdown to a Catastrophe Pt. 2 | Full Documentary

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Earthqaukes are cause by tectonic plates rubbing or colliding with each other, a tsunami is caused by an earthquake.

A seismograph is the main earthquake measuring device, the recording is calld a seismogram. The height of a tsunami is measured by tide gauges.

Some effects of these things are:
Floods, fire, property damage,  and deaths

One of the main relationships are the fact that tsunamis are caused by the movement of earthquakes.
I like how you explained the effects of earthquakes Laclan. You should also post your video on tectonic Tim Tams!

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Tsunami's are dangerous natrual disasters. They can be caused by earthquakes, volcanic erruptions or a landslide.
The Earthquake's movement forms series of huge waves that can reach the height of 100 ft, and come towards you at the speed of 450 km/h. As tsunami's are lightning fast, they can travel the whole pacific ocean in just a day. If the Tsunami is disaterous, (which most are) it could destroy buildings and homes which would cost a fortune to repair.
Good information. Try to summarise it in your own words rather than cut and paste. A few people have posted the same information. Hope you are well Rhea!

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Tsunamis can occur when earthquakes or movements below the Earth's crust happen. A Tsunami can reach incredible speeds so you cannot outrun it. You should try to get to the highest point possible. Tsunamis can form kilometres out at sea and gains speed and power as it approaches land. Tsunami's can cause devastation and destroys buildings and towns.
Great advice Ella, in case someone ever gets caught up in a tsunami. Good job!

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Earthquakes... Woah! Double click to add your name in here

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Earthquakes... Woah! Double click to add your name in here

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Earthquakes are when earth's Tectonic plates move in a number of ways. They can hit each other, they can slide against each other, or they can move away. Most of these don't cause anything on the surface, but sometimes they do. only a very small percentage of earthquakes that we can feel are really bad. So that's good, Scientist's are able to determine the scale by using seismographs. They put them on a scale of 1-10. Which speaks for itself. 1 Ok 10 bad
So and that's Earthquakes.
Great info, well summarised in the lines  '1 Ok 10 bad'. Can you just double click on your post and edit it to include your name.

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TSUNAMI!!!!!!!
Super cool
Caused by underwater earthquakes and underwater volcanoes. They can cause some serious damage, phew lucky I haven't been in one... a least not yet. Tsunami waves can reach very high, the highest ever was 30 meters! There are 6 grades of tsunamis. One being not that powerful and six being really high and strong.
Tsunami's are one of the worst natural disasters.
This information is so your style, Will. You gave me a laugh and informed me too!

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Earthquakes are the vibrations caused by rocks breaking under stress. The underground surface along which the rock breaks and moves is called a fault plane. The focus of an earthquake is the point where it originated within the Earth. The point on the Earth's surface directly above the focus is called the earthquake epicentre.
Excellent information and a powerful photo to show the damage an earthquake can cause!

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earthquakes  Double click to add your name here

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earthquakes  Double click to add your name here

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Earthquakes are unpredictable they happen when there is vibration though the earths crust. Earthquakes happen all over the world every day. An average earthquake acts around a minute. There are 500 000 earthquakes per year. There are four types of earthquakes tectonic, volcanic, collapse and explosions.
Good try! I'm not quite sure what you meant with the last sentence. Try to reword it if you can.

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Tsunamis/tidal waves are a series of waves caused by the tectonic plates moving underwater causing an earthquake. The result of the uneven ocean floor always moving makes the water above rising and fall creating the waves. Did you know that waves can travel as fast as a jet? (640 - 960km per hour)At this phase, it is only 0.5cm meters tall as a result fishermen out at sea don't notice the destructive wave and only come back home to find rubble.
I am so impressed that you summarised the information yourself. I've helped you with your spelling a bit. Great Gif too!

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Earthquakes are caused by movement of tectonic plates beneath the earth's crust. Tectonic plates are like jigsaw puzzle pieces that all fit together to make the earth's crust. However, sometimes they rub together, pull apart or slide above or beneath others. When this happens, the movement causes the ground above to shake. Sometimes this movement can be felt violently and for many kilometres around it. The intensity of the shake is measured in richter scale.

There is a horse-shoe shape area in the pacific ocean, to the east of Australia. This horse shoe is where the most frequent and sever earthquakes occur. Countries along this horse-shoe include New Zealand and Japan. In recent history, New Zealand has experience of earthquake that destroys a lot of beautiful city of Christchurch.

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How are earthquakes recorded? Earthquakes are recorded by a seismographic network. Each seismic station in the network measures the movement of the ground at that area.The Richter scale measures the largest wiggle ( which is the amplitude) on the recording, but other magnitude scales measure different parts of the earthquake. Like the mercalli scale, it is used to measure the intensity of the earthquake. That's right Mouksha! I will see if I can find a picture of the machines that measure earthquakes and their print outs.

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Earthquakes Double click here to type in your name

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Earthquakes Double click here to type in your name

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Earthquakes are the result of tectonic plates shifting/crashing into each other under the Earth's surface. They can be measured using a seismographic (size-mo-graph-ick) method. Some common effects of earthquakes are fires, floods, tsunamis, and completely destructed buildings and homes. Over 5000 minor earthquakes occur in Japan each year! In fact, my family and I were on holiday there during one in 2017! We were about 20 or 25 stories up! Ways to decrease the severity of earthquakes are; building safer structures and providing education on earthquake safety. Stay safe! :)
Fantastic information and a great GIF to match. Just type your name into the subject box so I know who did the great work!

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Tsunamis are very large waves caused by underwater earthquakes, landslides or volcanic eruptions. A tsunami can reach speeds of 800kph and has been recorded to get as big as 30m tall. But don't worry, tsunamis only happen once about every 10-12 years. But if a tsunami does strike, all you need to do is wear a snorkel because if you wear a snorkel you can breathe underwater.
A very well written answer Nicholas. Did you make that GIF? I know you are good with technology!

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Tsunamis can be formed by movement under the earth such as earthquakes, volcanic eruptions under the sea, land slides, meteoroid or any underwater explosion or movement.

The movement from an earthquake causes series of giant waves which can reach the height of 100 ft and can reach the speed of 450 kilometres per hour. Because tsunamis are so fast, they can cross the Pacific Ocean in just one day. An impact of a tsunami can destroy homes and building which costs a lot to repair after the disaster.
Great info Natalie and a good picture to match!, well done!

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An Earthquake occurs when 2 tectonic plates either rub together, bump into each other or 1 tectonic plate climbs on top of the other. When these things happen, it is called convergent boundary.
What a brilliant diagram you have included Hannah. a top post, you should be the teacher!

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Earthquakes occur by a sudden slip on a fault. The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. It is a sudden release of energy that spreads across the earths crust. For homes with foundation problems following an earthquake, repairs can easily cost between $5,000 and $10,000. Sadly, homeowners without earthquake insurance often spend more than $30,000 in repairs following an earthquake.
You've found a good image to match your information Zarah!

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Tsunami is a Japanese word: 'tsu' meaning harbour and 'nami' meaning wave. Tsunami are waves caused by sudden movement of the ocean surface due to earthquakes, landslides on the sea floor, land seeping into the ocean, large volcanic eruptions or meteorite impact in the ocean.
Great job, Roshan. I like how you told us about the origin of the word Tsunami!

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Tsunamis are usually formed by an underground earthquake or a volcano eruption. They can reach up to speeds of 450 km per hour. That's 135 km faster than a jet. In the open oceans tsunamis are only about 1 meter high but the shallower it gets the more it grows. They can rise up to 35 meters that's the same as a 10 floor block of flats. Tsunamis can go as far as 10 miles that's the same as 16 km.
Well done mate! I am so pleased you summarised the info in your own words. That's a good gif too!

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An earthquake is an intense shaking of Earth’s surface. The shaking is caused by movements in Earth’s outermost layer.
Why Do Earthquakes Happen?
Although the Earth looks like a pretty solid place from the surface, it’s actually extremely active just below the surface. The Earth is made of four basic layers: a solid crust, a hot, nearly solid mantle, a liquid outer core and a solid inner core.
A diagram of Earth's layers. Earthquakes are caused by shifts in the outer layers of Earth—a region called the lithosphere.
The solid crust and top, stiff layer of the mantle make up a region called the lithosphere. The lithosphere isn’t a continuous piece that wraps around the whole Earth like an eggshell. It’s actually made up of giant puzzle pieces called tectonic plates. Tectonic plates are constantly shifting as they drift around on the viscous, or slowly flowing, mantle layer below.
Earth's crust is fractured into tectonic plates that have been moving very slowly over the Earth's surface for millions of years. Credit: USGS
This non-stop movement causes stress on Earth’s crust. When the stresses get too large, it leads to cracks called faults. When tectonic plates move, it also causes movements at the faults. An earthquake is the sudden movement of Earth’s crust at a fault line.
This photograph shows the San Andreas Fault, a 750-mile-long fault in California. Credit: Public Domain
The location where an earthquake begins is called the epicenter. An earthquake’s most intense shaking is often felt near the epicenter. However, the vibrations from an earthquake can still be felt and detected hundreds, or even thousands of miles away from the epicenter.
How Do We Measure Earthquakes?
The energy from an earthquake travels through Earth in vibrations called seismic waves. Scientists can measure these seismic waves on instruments called seismometer. A seismometer detects seismic waves below the instrument and records them as a series of zig-zags.
Scientists can determine the time, location and intensity of an earthquake from the information recorded by a seismometer. This record also provides information about the rocks the seismic waves traveled through.
A seismometer records seismic waves as a series of zig-zags.
Do Earthquakes Only Happen on Earth?
Earthquake is a name for seismic activity on Earth, but Earth isn’t the only place with seismic activity. Scientists have measured quakes on Earth's Moon, and see evidence for seismic activity on Mars, Venus and several moons of Jupiter, too!
NASA’s InSight mission took a seismometer to Mars to study seismic activity there, known as marsquakes. On Earth, we know that different materials vibrate in different ways. By studying the vibrations from marsquakes, scientists hope to figure out what materials are found on the inside of Mars.
An artist's illustration of the Mars InSight lander operating on the surface of Mars. Credit: NASA-JPL/Caltech
InSight is collecting tons of information about what Mars is like under the surface. These new discoveries will help us understand more about how planets like Mars—and our home, Earth—came to be.
Wow what a lots of detailed information Bardsley! Its okay to write a shorter paragraph in your own words but thanks for copying so much for us to read.

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The video is very educational so watch it.
Love it Alex! My personal hero, Bill Nye the Science Guy!

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An underwater earthquake, a volcano eruption or a landslide mostly causes a tsunami.  Only on very few occasions a tsunami is caused by a giant meteor in the ocean. Tsunami waves can be as huge as 100 feet.  About 80% of the tsunamis occur in the Pacific Ocean's Ring of Fire.
Fantastic diagram Harry! and well written information. Hope you are doing well at home!

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If the earthquake occurs in the ocean, it can push up powerful waves, known as tsunamis. The sudden upward or downward movement of the seafloor during an earthquake creates large tsunami waves, Earthquakes can also trigger tsunamis by unleashing underwater landslides, which also displace huge amounts of seawater. Most tsunamis–about 80 %–happen within the Pacific Ocean. “The Ring of Fire,” is  geologically active area where tectonic shifts make volcanoes and earthquakes common. Tsunamis race across the sea at up to 805 kilometres an hour -about as fast as a jet airplane Thats fast. At that pace, they can cross the entire expanse of the Pacific Ocean in less than a day.
Great research, Ben. I wouldn't want to be in that little car when the wave hit!

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If the earthquake occurs in the ocean, it can push up powerful waves, known as tsunamis. The sudden upward or downward movement of the seafloor during an earthquake creates large tsunami waves, similar to a child splashing in the bathtub. Earthquakes can also trigger tsunamis by unleashing underwater landslides, which also displace huge amounts of seawater. Most tsunamis–about 80 %–happen within the Pacific Ocean’s “Ring of Fire,” a geologically active area where tectonic shifts make volcanoes and earthquakes common. Tsunamis race across the sea at up to 805 kilometres an hour -about as fast as a jet airplane. At that pace, they can cross the entire expanse of the Pacific Ocean in less than a day.
Well answered, Keira. I love the gif you attached. Poor ocean animals!

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Tsunamis are caused by violent seafloor movement associated with earthquakes, landslides, lava entering the sea, seamount collapse, or meteorite impact. The most common cause is earthquakes.
A great post Ellie, well done for sharing this great information.

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How Earthquakes Trigger Tsunamis - Bang Goes The Theory, Preview - BBC One

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http://www.bbc.co.uk/bang Follow Bang on Twitter @bbcbang and #bbcbang. Jem Stansfield explains how pent-up energy between tectonic plates can cause a tsunami when it is eventually released.

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Alyssa and Ava. What causes Tsunamis and Earthquakes. 

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Alyssa and Ava. What causes Tsunamis and Earthquakes. 

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Tsunamis-
Volcanic activity, Certain weather types and earthquakes.

Earthquakes-
A sudden slip on a fault.
Great job Ava and Alyssa!

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Most tsunamis are caused by earthquakes on converging tectonic plate boundaries. However, tsunamis can also be caused by landslides, volcanic activity, certain types of weather, and possibly near earth objects. Tsunamis are detected and measured by coastal tide gages and by tsunami buoys in the deep ocean. The tide gages measure the tsunami wave directly. In the deep ocean, sensors on the ocean floor detect the pressure signature of tsunami waves. Contaminated water injures and causes health hazards as they pass by, electric poles and electrical appliances are affected and leakage of gas explosions. Most tsunamis are caused by large earthquakes on the sea floor when slabs of rock move past each other suddenly, causing the overlying water to move. The resulting waves move away from the source of the earthquake event.
Excellent information Peyton and a great video for the kids to watch. You are amazing!

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Tsunami Facts for Kids - What causes a Tsunami - What is a Tsunami for Kids? - Tsunami Facts Tsunami

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An Earthquake happens when 2 blocks of earth move past each other. The surface where this happens is called the fault plane. The place where the earthquake starts is called the hypocentre. Sometimes smaller earthquakes occur in the same spot before the larger one, this is called a foreshock. The main earthquake is called the mainshock, it has the biggest and the worst impact. After a mainshock there are always smaller ones that follow, they are called aftershocks. Aftershocks always occur in the same spot as the mainshock.
Excellent answer Alice! What a perfect image to show the effect of an earthquake. I wouldn't want to be driving on that road when it hit!

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most tsunamis are caused by earthquakes on converging tectonic plate boundaries. however, tsunamis can also be caused by landslides, volcanic activity, certain types of weathers, and possible near earth objects e.g.

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An earthquake happens when fault lines rub against each other and when the pressure is too much, seismic energy is released into the earth that shakes it. That energy coursing through the earth causes earthquakes to happen. A tsunami occurs when an underwater earthquake happens. The waves move as fast as 700 kilometers per hour. They are barely visible  at first then grow into massive waves as they approach shallow waters. Follow the link for information about when California's fault lines snap in April 18th 1906 and the Richter scale.

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Alyssa and Ava.  How Tsunamis & Earthquakes are Measured 

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Alyssa and Ava.  How Tsunamis & Earthquakes are Measured 

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Tsunamis- they are measured by Coastal Tide Gags and Tsunami buoys in the deep ocean.

Earthquakes- Earthquakes are recorded by a seismographic Network.
Good information Well researched !!!

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Tsunamis are generated by any large movement in the sea. The most common cause of a tsunami is sea floor uplift, which is made by an earthquake. The Bureau of Meteorology own these deep-ocean tsunami detectors that can detect the existence of a tsunami out in the ocean. The violent force of a tsunami results in instant death, most commonly by drowning, buildings collapsing, electrocution and explosions from displaced gasses. The relationship between tsunamis and earthquakes are that most tsunamis are cause by large earthquakes on the sea floor.
Fantastic info Thomas! I will find an image for your great post. Thanks TP

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Tsunamis occur when the ocean is disrupted by an Earthquake in the Ocean. This causes massive waves at over 800km/h about the speed of a Boeing 737.
Excellent and interesting information LEVI! Well done mate!

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Second Video
I love this Levi! THANKS

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Earthquakes occur when Tectonic Plates interact with each other is a certain way. This causes huge vibrations that can shake buildings roads and even make mountains because the land pushes up. That is how the Himalayas were formed.
You should be teaching the class you are an expert!. Keep the great posts coming!

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This video explains that earthquakes occur when tectonic plates slide past each other in opposite directions. When this happens shock waves are released through the ground.

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Why do Earthquakes happen ? | Earthquake for Kids |What is an Earthquake?

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This is a good website that describes how earthquakes are caused, and some of the most significant ones in history.
Well done for finding this website. Can you add your name so I know who to thank.

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We operate the National Earthquake Alerts Centre to provide around the clock monitoring, analysis and alerting of significant earthquakes to the emergency management sector. To help understand what could be at threat from earthquakes, we provide about buildings, demographics, community infrastructure and agricultural commodities.

Our nation-wide seismic hazard assessment defines the level of earthquake ground shaking across Australia that has a specified likelihood of being exceeded across a given time period.

This information is used by building standards and decision makers to develop mitigation strategies so that communities can be more resilient to earthquake events.

We also use this information to provide advice to government on seismic hazards that may impact infrastructure projects for a low-carbon economy.

We also provide around the clock about people, property and infrastructure potentially exposed. Our information aids in providing an understanding of the situation to targeted preparedness, response and recovery efforts.

Our products, tools and data provide a better understanding of hazard vulnerabilities for all sectors to plan, prepare and reduce exposure to natural hazards improving preparedness now and into the future.

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Earthquake | Community Safety | Geoscience Australia

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We operate the National Earthquake Alerts Centre to provide around the clock monitoring, analysis and alerting of significant earthquakes to the emergency management sector. To help understand what could be at threat from earthquakes, we provide about buildings, demographics, community infrastructure and agricultural commodities.

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what causes earthquakes
An earthquake is caused by a sudden split on a fault. when the stress on the edge overcomes the friction, there is an earthquake that releases energy waves that travel through the earth's crust   and cause the shaking that people felt. in California there are two tectonic plates, the pacific plates and the north american plates.
Excellent info Teteho!. Well done mate! I appreciate your research.

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A tsunami is a series of enormous ocean waves caused by earthquakes, underwater landslides, volcanic eruptions, or asteroids. Tsunamis can: Travel 20-30 miles per hour with waves 10-100 feet high. Cause flooding and disrupt transportation, power, communications, and the water supply.
Good information just add your name to the subject box. You can click on the three dots up the top to edit your post.

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An earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane. The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter.
Great info.. the hypocenter is also called the focus of the earthquake. I love this model.

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What Causes Tsunamis?
Most tsunamis are caused by earthquakes, when rock slabs move past each other suddenly, which causes the water to move, resulting in the waves created to move away from the earthquake event. However, they can also be caused by landslides, volcanic activity, specific weather, and sometimes (very rarely) near-earth objects.
How Are Tsunamis Measured?
Tsunamis are measured in different ways; coastal tide gages, which measure the wave directly, and  also Tsunami Buoys that are deeper out in the ocean. Finally, there are sensors on the ocean floor, which detect pressure of the Tsunami as it passes.
What is the effect of a Tsunami?
Not only do Tsunamis endanger human lives, but also the lives of insects and animals, too, just as well as plants and natural resources. Tsunamis uproot plants and trees,  and flood bird nesting sites, ruining homes and habitats for wildlife.
Great information Ruby! I love the GIF you found. I wonder what it is like for the animals swept up in a tsunami?

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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.
This post has such good information. Well done Franklin!

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Earthquakes occur as a result of sudden movements in tectonic plates. The centre of an earthquake is called the epicentre.