Anonymous
Anonymous asked in Science & MathematicsEarth Sciences & Geology · 1 decade ago

H.W HELP IN EARTHQUAKES AND TSUNAMIS !! GR.7 SCIENCE!!!PLS !!?

ok my science teacher wants us to hand 2 researches 1 about earthquakes and the other about tsunamis!! so here are the questions she wants us to answer:

Earthquakes

1. The most 3 destructive earthquakes in the world.

2. Where did the famous earthquakes occur?

3. Their source and their reason.

4. What deformation they caused to the earth?

5 . Can we predict earthquakes.

6. Solutions to decrease the harmful effect of earthquakes .

7. Your ideas too to reduce the effect of earthquakes.

Tsunamis

1. Where do tsunami waves happen?

2. Their causes.

3. How did they affect the nature?

4. How to reduce their damaging effect?

5. Can we predict a tsunami?

Update:

in the 1st question i mean what are the 3 strong types of earthquakes

2 Answers

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  • 1 decade ago
    Favorite Answer

    One of the most destructive earthquakes to occur in recent history was the Boxing Day earthquake 2004 that occurred in the Indian Ocean. The earthquake was somewhere in the region of 8.2 on the Richter scale. This earthquake occurred in the sea and generated massive tsunamis which killed over 280,000 people. The tsunami that resulted from the earthquake is the main reason it was one of the most deadly earthquakes.

    http://en.wikipedia.org/wiki/2004_Indian_Ocean_ear...

    Another notable earthquake is the San Francisco Earthquake that occurred in 1906. This earthquake caused a massive fire in San Francisco, causing wide spread damage which almost ruined San Francisco for good. If it had not been for their mayor who was thought to be corrupt, San Francisco may not have been rebuilt.

    http://en.wikipedia.org/wiki/San_fransisco_earthqu...

    Another earthquake for your project. The Chile Earthquake of 1960.

    http://en.wikipedia.org/wiki/1960_Valdivia_earthqu...

    We cannot predict earthquakes.

    http://en.wikipedia.org/wiki/Earthquake_prediction

    Earthquakes are caused by movements in the earth’s plates and usually occur at subduction zones. A subduction zone occurs at destructive plate boundaries also known as convergent plate boundaries. One plate slide under another (subducts). This movement generates heat which creates slipping. It is this slipping that causes earthquakes.

    http://en.wikipedia.org/wiki/Plate_tectonics

    http://en.wikipedia.org/wiki/Subduction_zones

    http://en.wikipedia.org/wiki/Seismic_waves

    We can't totally earthquake proof everything but we can take steps to reduce the effects on buildings etc by better engineering methods.

    http://en.wikipedia.org/wiki/Earthquake_proofing

    Tsunamis

    Tsunami waves occur in the sea. They are commonly caused by earthquakes but can also be caused by, Volcanic eruptions (volcanogenic earthquakes), landslides or rock and ice falls, and although very rare, can also be caused by meteor/asteroid impact.

    Tsunamis can destroy habitats of animals and cause extinction in some animals. Tsunamis can also kill coral reefs and the life that resides in the reefs. Tsunamis also destroy human homes and can cause a mass loss of life.

    We cannot predict when a tsunami will occur but we can monitor them when they occur by using sensors in the ocean. This helps us to issue warnings people to people so that they may move to higher ground, thus saving many lives. In some instances though, the tsunami can be triggered too close to land to issue enough warning.

    You can find out more about tsunamis via this link:

    http://www.noaa.gov/

    This should give you lots of useful information for your assignment and will help you develop a deeper understanding of the subject.

    I hope this helps.

    Kind regards

    Leanne

  • 1 decade ago

    okay on Earthquakes:

    1) define 'destructive'. do you mean the 3 strongest quakes recorded?

    a) off the coast of Chile 1960 (9.6)

    b) gulf of Alaska 1964 (9.2)

    c) Banda Aceh 2004 (9.1)

    or just over all damage and life loss it caused (not including tsunami deaths)

    a) Shaanxi, China 1556 (approx. 835,000 killed)

    b) Tangshan, China 1976 (approx. 255,000 officially listed killed, some reports over 650,000)

    c) Aleppo, Syria 1138 (approx. 230,000 killed)

    The Banda Aceh quake WITH tsunami still came in 4th

    2) Most famous quakes?

    a) San Francisco 1906

    b) Lisbon, Portugal 1755

    c) Tangshan, China 1976*

    * my choice because the quake in the area just prior, by about a week I believe, has been the only quake successfully predicted by men (too bad they missed this one)

    3) well if I do your work you won't learn about them, plus you might select others.

    4) well can tell you that with the Alaska quake (1965) it was so widely felt and moved the earth as far away as South Africa. The land moved as much as 4" in Texas and sloshed Lake Pontchartrain. It vertically moved the earth in the Gulf of Alaska as much as 40 feet in some areas.

    5) so far, they can make educated guesses. Only one quake was predicted. Chinese government moved people out and it did hit. but then as they were trying to get people back in the area where they had moved them to safety had a quake and killed hundreds of thousands.

    6) you cannot make a building earthquake proof, only earthquake resistant. but right now that costs a lot. making such adjustments more economical would decrease harmful effects. And doing stupid things like building a nuclear power plant on a fault line really needs to stop.

    7)well that would be up to you, this is your project.

    Tsunamis:

    1) usually in open oceans, but there have been some more into coastal fjords.

    2) large quakes that move large blocks of earth (usually along subduction plate boundaries).

    landslides (often have the largest known tsunamis), and volcanoes also can create them.

    3) They can level large areas, including many very strong manmade objects like concrete builidings with steel reinforcements. Thier affect can reach miles inland.

    4) right now many coastal areas are making break waters (man made reefs) to cause such waves to break early. having evacuation plans in place. Warning systems such as the buoy network.

    5) some times. since we know what can cause them we have a better shot than predicting earthquakes. This is why we have in the U.s. the Tsunami Warning Centers. They often issue warnings on the emergency broadcast system

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