Tsunami facts: check out the mighty wave!
Learn all about these mammoth forces of nature!
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?
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?
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?
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.
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!
What do you think of these tsunami facts? Let us know by leaving a comment, below!
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COMMENTS1
Lyla
That’s so cool hope I can learn more x
Neisha
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Random guy
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Me
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AOGA
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FOXY123
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Yo mamas can dance
This was helpful. Thank you.
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thats kinda scary tho ;-;
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Luna
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Lol
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Thanks National Geographic Kids, this helped me a lot.
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These facts really helped me as I have a theme project about active planet Thanks so much! ;D - turtlefox
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Thanks! This really helped me with my Geography Homework
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cool, interesting and good for homework
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Euan
Well I for one would not like to live in one of those countrys that get swept with tsunamis. And just think that when I was 18 or something I wanted to go on holiday to one of those places. Please tell me if there`s a nice country that doesn`t have any tornadoes hurricanes or tsunamis
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Me
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To mama
Im falling asleep
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what going
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Awesome fact!
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AWESOME FACTS! I learnt alot!
HappyGiraffe
Thats awesome! Although I wouldnt want that to happen to us though. I may find that really scary! About tsunamis, Im pretty sure there has been a tsunami quite recently in Japan. Maybe you could write about that?
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this page is great
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Wicked Id like to see that happening
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hi peple
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LOLZ COOL
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Im doing a project on tsunamis-This REALLY helped! (Of coarse I didnt plague anything) Keep going, Nat. Geo! Youre awesome! -NerdMonster, Grade 6.
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A very big help with homework
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anya and beth
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Scary
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10 times the awsome
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Awesome website! I used it for research on a class weather project.
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hi
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I like this! I love seeing the pictures of tzunamis. its really sad about the town.
Pop
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nice website
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Derp
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helpful thanks
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awesome
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Theta
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soo cool its good for projects and it helped me allot ! thanks!
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really helpful
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Why does tsunamis have to be so bad that it leaves it to a tragedy?
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great article
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cool
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Hi this is a good website from your mom
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This is a good website and Im AWSOME
Geography test
Helpful hehe
vrishabhg13
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ur mom
I think in the paragraph where it explains the way to measure tsunamis it should have more of how they measure it. I also think u should have a little more about tsunamis. All in all I think this a terrible.
jeby
cool
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Awesome
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so cool
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nice.
Oh yaa
Thanks for the information
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I have to admit, this was very helpful to copy and paste work off for a school project which is supposed to be in 2 hours...its now 4am...oops
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wow this is really interesting i am shocked about the before and after picturs
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Lol
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thanks though:)
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you helped me...alot!!
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thanks for the help!
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this is freaking me out. isnt it amazing?
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I am researching tsunamis for homework
zainab25
FANTASTIC but one thing there isnt any facts about tsunamis WE NEED FACTS!
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what no way
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Very Interesting to know about tsunami.
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this is the best ocean web site
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this happened to me my home is gone
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I am studying tsunamis
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This is quite terrifying and cool at the same time
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cool
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thank you national geo
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This is so helpful.
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This will really help my science project, Thanks!!!
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gts
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lol bob
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this is a huge help got to do talk to class and this will really help
purple
so sad to people who went through this. so much work just to be washed away : (
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OMG
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Thank u guys! It helped me on my project See you l8r ??
You
Absolutely terrible I learnt nothing
Reg
Great
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In school were learning about Earthquakes Valcanos and thunames so we are suppose to pick 1 and find facts about it I am choseing thunames so its helpful
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Wow! Kinda like the facts in here
#21
bad website#shutdown site
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i find this very helpful x
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sostupuid im doing a report and it,s not helping
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Thanks, this was very useful. :)
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amazing
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helpful
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it is so cool
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not really informational.....
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Omg
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awesome!!!!!!!
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Scary!!!!!!
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good 4 my report thanks national geographic
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good info for my report thanks a lot National geographic!!!!!!!!!!!!!!!!!!!!!!!!!:)
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epic! cool! awesome!
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aaassssommmeee
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This helped me a lot with research
dumancela
THANK YOU SO MUCH NATIONAL GEOGRAPHIC SO MUCH
andres
so cool but sad too:]
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thats super duper cool
Rayan
I used this for my science poster
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Cool
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wow
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Amazing,
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good work keep it up
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yea it is cool wow im so happy to be learning more about tsunmai
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cool
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Awesome
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Wow
LaraPotter
Love this website. It helps sso much when it comes to homework.
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Epic
matida
cool really cool awsome wow
Griffey
AWSOME
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Thank you for information
henri
thank you.
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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
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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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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wow awesome
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i love this vebsite
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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
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That weird,cool and sad at the same time.
jahad
great!
chupachups808
cool
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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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