tsunami facts

A tsunami (soo-NAH-mee) is one of the world’s most powerful and destructive natural forces.

They can speed across the ocean as fast as a jet plane, swallow up islands and wipe out villages.

But what causes tsuamis…? Join National Geographic Kids and dive into our tsunami facts to find out!

Tsunami facts

What causes a tsunami?

tsunami facts

Meaning “great harbour wave” in Japanese, tsunamis are sometimes called “tidal waves” but their strength has nothing to do with the tides. About four out of five tsunamis happen within the Ring Of Fire, a zone in the Pacific Ocean where earthquakes and volcanic eruptions frequently take place.

Giant slabs of the Earth’s crust, called tectonic plates, grind together. Sometimes, though, the plates get stuck, the pressure builds up and they suddenly slam into a new position. This causes an earthquake. If an earthquake lifts or drops part of the ocean floor, the water above rises and starts spreading across the ocean, causing a tsunami. Underwater landslides or volcanic eruptions can also displace water (cause water to spread across the ocean) and may lead to a tsunami.

How big is a tsunami?

tsunami facts

Out in the open ocean, tsunami waves are only about one-metre high because the water is deep. However, as the water becomes shallow, the waves slow down and begin to grow. They can rise 35m or higher – that’s the same as a 10-floor block of flats! However, the scariest thing about a tsunami is its wavelength, as this determines how far inland it can travel. Whereas a large wave caused by a storm might have a wavelength of up to 150m, a tsunami could reach up to a fearsome 1,000km!

How fast is a tsunami?

tsunami facts

A normal wind wave travels at about 90kmh, but a tsunami can race across the ocean at an incredible 970kmh! Sometimes, before a tsunami hits, there is a huge vacuum effect, sucking water from harbours and beaches. People can see the ocean floor littered with flopping fish and other sea animals. Then a wave blasts onto the shore minutes later, then another and another for two hours or more. There may also be up to one hour between each wave.

tsunami facts

Can you predict when a tsunami is coming?

To save lives, scientists established the Pacific Tsunami Warning System, based in Hawaii, in the USA. Its network of detectors can track quakes that may cause a tsunami. These waves can race from one side of the Pacific Ocean to the other in less than a day, so people need to be warned in time to head for higher ground!

tsunami facts

What do you think of these tsunami facts? Let us know by leaving a comment, below!

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    love it

  • BEREN

    FANTAST?C

  • mini_me4256

    awesome

  • lyndsey

    lol

  • lyndsey

    cool!!!!!!!!!!!!!!!!!!! lol

  • ghjklkj

    cool

  • Bob

    Cool

  • t181818

    awesome

  • zehong1

    cooooooooooooooooooooooooooooooooooooooooooooooooool cool i loved it!

  • jajajjajajaj

    pooooooop

  • funny

    cool

  • funny

    awsome!

  • youster

    it is so cool

  • ryyyyyt

    epik

  • Imrandom

    not really informational.....

  • Cat

    Omg

  • FATTYPANTS

    awesome!!!!!!!

  • beee20

    Scary!!!!!!

  • cool_ 99

    good 4 my report thanks national geographic

  • cool_ 99

    good info for my report thanks a lot National geographic!!!!!!!!!!!!!!!!!!!!!!!!!:)

  • dragons-human

    epic! cool! awesome!

  • shaaqaib

    aaassssommmeee

  • MaddieV

    This helped me a lot with research

  • dumancela

    THANK YOU SO MUCH NATIONAL GEOGRAPHIC SO MUCH

  • andres

    so cool but sad too:]

  • anabelac28406

    thats super duper cool

  • Rayan

    I used this for my science poster

  • Moususorus

    Cool

  • df

    wow

  • Lisa7541189

    Amazing,

  • nevsonic1234

    good work keep it up

  • jasmine torres

    yea it is cool wow im so happy to be learning more about tsunmai

  • hanah111

    cool

  • BestPlayer999

    Awesome

  • Anya_The_Animal

    Wow

  • LaraPotter

    Love this website. It helps sso much when it comes to homework.

  • Awesomegirl652

    Epic

  • matida

    cool really cool awsome wow

  • Griffey

    AWSOME

  • Jonathan118

    Thank you for information

  • henri

    thank you.

  • Jaiden246

    That would be scary but awesome. I probably would die.

  • croline

    so cool

  • Macey-Sean

    This helped us alot

  • Naruto4321

    Wtf this is not helpful

  • happy

    this was really helpful for my science homework

  • marleni

    This helps me a lot about tsunmai Thanks

  • harvs9

    thank you! very intresting!

  • elea

    this helped me a lot to do my tsunami homework for y6 reading journal work

  • awesomegirl202

    this helped me out a lot thanks!

  • happy123

    cool

  • me1

    cool

  • superboy

    this is a super cool website

  • Zachary

    Wow

  • Noah111111111

    very good facts

  • Emi- Jess 10

    I was ill one day,but i still found myself up on the computer googling facts about Tsunamis for my group at school. Thanks alot National Geographic !!!!!!

  • ethanwesson

    This site was very helpful for my school homework it was also very factual and interesting and intriging THANKYOU!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • Annacool

    wow awesome

  • doggy

    i love this vebsite

  • shasha

    COOL! very good information :)

  • Po

    Wow!

  • Annabell

    Awesome never new that, I was surprised how big it is I am now interested in tsunamis.

  • My names Jeff

    Cool

  • awesome88

    awesome website , awesome facts

  • Josh

    Great website plz ad more pics

  • interestgirl

    amazing

  • Marley

    Thats awsome

  • oldmanisc00l

    Such an awesome website. I love facts that tell you about the Natural World.

  • Vittorio7

    I like this website!!!!!!!

  • ExpertGamer

    Nice

  • Trackstar_Lizzy

    That weird,cool and sad at the same time.

  • jahad

    great!

  • chupachups808

    cool

  • GossipGirl299

    THAT WAS SO BIG

  • Super cute

    This website is cool !!!!!!!!!!!!!!!

  • rayshwan

    love this website

  • cooldude47

    What pasific month does tsunamis happen in?

  • will123456789

    im learing :(

  • bonnie

    hi I think your site is really good

  • FYI

    GREAT WEBSITE :)

  • JeffSwag

    This website is very useful.

  • ellsbells

    these are really good facts!! thank you this really helped me to understand some things about tsunamis!

  • lolol

    awesome!

  • lolol

    cool! :)

  • Nat

    epic!

  • Nat

    epic

  • cooldude47

    Totally radical dude

  • hi1

    nice i am doin a unit about it.

  • Grace_is_awesome

    Wow thats really good to know for school!

  • tinka

    thank you for the facts i now know about tsunamis xxx

  • bob101101101101

    wow i didnt know that

  • Line Ranger

    Great job How did you find this facts AWESOME!!!!!!!!!!!!!!!!!!!!!!!!!

  • serina

    cool

  • bubba

    ahhhhhhh run a tsunami

  • yomm

    also the topography of the oceans floor changes the size of the seismic sea wave!!!!!

  • researcher

    good for researcher do more! please.

  • bubba

    Ahhhhhh run a tsunami

  • Golden_oreo

    Seriously this info is SO helpful for school!!!

  • Keljn

    Wow

  • jacob

    asomme

  • oliverwilson

    tsuami info is great

  • rayson

    well tsunimas are sick but they can millions

  • bobgeregas

    this is realy shoking

  • Golden_oreo

    OMG! This is amazing info! But still, that would be something really scary to be in!!!

  • bubba

    Cool

  • bubba

    run

  • Cookie Luv ! :D

    This website helps so much withe homework !!! Ill defenitly come back to this web site

  • AKWARD

    OMG ITS SO COOL BUT SCARY

  • eunniel

    run everybody

  • eunniel

    i like it

  • eunniel

    men what will happened to us

  • 200

    AWSOME

  • hono

    i did not know

  • Kool kid no 1

    You helped me with homework thanks

  • Kool kid no 1

    I feel sorry for them

  • meepmeep

    great info for homework! thanks

  • amy44

    Cool!

  • Callan

    helped loads thx

  • winner

    soooooooo cool

  • ready

    i like it

  • hasad

    cool

  • toki

    yay

  • toki

    awsome

  • dodobird

    :-)

  • fias

    scary

  • #Natasha:)

    Tsunamis are terrible!

  • Detty

    that some scary stuff

  • waffles

    very good info i love it i could read it all day every day

  • Amy 543

    Amazing wonderful full of information

  • stock

    Thank you for this it helped a lot.

  • dude

    i hate tsunamis, they are really bad!!!!!!!!!!!

  • Duke

    creepy really creepy

  • miriama

    that is the scariest thing i have seen

  • hjkhhd

    oh no

  • SurplusOak06270

    hi that was vary interesting

  • rere

    Very helpful

  • John

    Helped

  • DinoMatt0710

    I am working on a project about tsunamis and this gives me juicy stuff!!!!!!!!!!

  • glenashia

    hi that was awsome

  • 81323pedro

    Great Info helped me.ð

  • mason

    this site was like totes peanut brittle and i was like all up in dem i learned lots bout tsunamis

  • Mason

    I loved this cite please go to it

  • peter410282

    It is very helpful.

  • scooter

    thanks for the help

  • at

    epic

  • ak47

    awesome this is very helpful .

  • Akshitha

    awesome this is very helpful .

  • yolo

    Now Im scared a tsunami will occur on the island that I live on.

  • BOBBERT

    OMG SO INTERESITNG

  • Jeff

    k den

  • pugs

    wow so powerful

  • pugs

    Tsunamis are powerful

  • Jose-123

    so helpful for homework and our project with biological

  • Lauren

    really helpful for homework!

  • jdfslka

    very good

  • stampy337

    wow Im amazed and scared

  • stampy337

    wow

  • stampy337

    scary!

  • stampy337

    Thanks for the knowledge :)

  • Patryk

    NOW i did not now that never

  • Khy

    Cooool

  • spongebobsquarepants

    that seems kinda sillyð

  • SlowlyPokingYou

    Wow! This will really help me with my writing assignment! Cool!

  • Sup

    Scary

  • Lehua

    Wow things in here are crazy cool and I learned so much!

  • Lehua

    Wow some things in here I do not know about in here

  • flippinawesometomakeadogflip

    awesome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

  • Awesomenewdiscovery

    I love all the pictures and stuff and things.

  • liamp21413

    Im cranky

  • liamp21413

    awesome

  • Bob

    cool

  • FaithL

    wow

  • Amelia

    amazing how a tsunami is formed!!!

  • polly

    Wow i didnt no

  • Emma

    COOL! i love this website

  • Walid

    I cant belive that a tsunami can do that with a boat

  • lol

    full of useful info

  • Steve

    This information helped me with my project.

  • ww

    wow! my homework is over!

  • clawdude

    AWESOME

  • claws

    awsome

  • sofia

    This really helped me out with my homework!

  • Funky_Monkey321

    OH MY WORD!!!!!!!

  • Funky_Monkey321

    OH MY WORD!!!!!!!

  • Funky_Monkey321

    OH MY WORD!!!!!!

  • unknown

    this was interesting and really good info

  • Person

    tsunamis r scary

  • jahson

    awsome

  • unknown-person

    hmm this is kind of good

  • unknown-person

    hmm this is kind of good

  • jahson

    this is cool

  • nia

    thank you National Geographic Ive learned much more

  • lucky777

    I love it!!!!!!!!!!!! I wanna know moooorrrrrreeeee!!!!!!!!!!!!

  • Ruby

    NG is a wonderful website to look at for homework.I would recommend

  • muj

    helping stuff

  • beauty155

    this really helped me with my geog presentation thanks NG!!

  • kitty

    i love this

  • CuteRecruit

    LOVES IT!!!!!

  • Bolop123

    I survived a tsunami!

  • Bolop123

    I was evacuated from a tsunami!

  • Emily

    Thats amazing but looks very scary

  • zoom51

    Amazing

  • kyra kurz123

    omg i luv this stuff how did tsunamies happen when or how where they formed

  • jack

    OMG i am going to have nightmares LOL!

  • jack

    this is great thank you national grog

  • TurtlePower

    Thanks, I really learned a lot from this!

  • Dantdm

    Awsome

  • Dantdm

    Cool

  • m

    WOW!!!!!!!!!!!!!!!!!!!!!!

  • jackie

    cool

  • sabirenaden

    this is really good

  • keelin

    I moved from Canada a few months ago and we get tsunamis there!!!!

  • Aquamarine

    This post really helped for my homework project! Thanks!

  • Ewan

    Whos seen the filmThe Impossible because that shows a tsunami and also gives you an idea of what it was like for those people who got caught in the wave

  • Ali pli

    Big Wave!!!

  • Maisie

    Hi again everyone. Im taking care of some birds today. That means feeding them and giving them water. Does anyone else do this?

  • Maisie

    I feel so sorry for the towns who get stuck in tsunamis. So Im quite glad to live in England! What about tornados? The horrible brown dirty tornado could rip up a town!

  • Cizzy

    WAVE!!!

  • Shanzie

    How sad

  • Abdul

    How many houses is destroyed in tsunami

  • Chloe

    Dont know what would if it happened to me

  • Josh_and_Ross12

    How many floods have there been and how many people died from it

  • palvi

    if this happened right now you wouldnt know what could happen

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