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

when earthquakes happen ?

when earthquakes happen under the ocean floor they sometimes cause hudge waves anyone know why its caused please help thanks

4 Answers

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  • Anonymous
    1 decade ago
    Best Answer

    An earthquake is the result of a sudden release of energy in the Earth's crust that creates seismic waves. Earthquakes are recorded with a seismometer, also known as a seismograph. The moment magnitude of an earthquake is conventionally reported, or the related and mostly obsolete Richter magnitude, with magnitude 3 or lower earthquakes being mostly imperceptible and magnitude 7 causing serious damage over large areas. Intensity of shaking is measured on the modified Mercalli scale.

    At the Earth's surface, earthquakes manifest themselves by a shaking and sometimes displacement of the ground. When a large earthquake epicenter is located offshore, the seabed sometimes suffers sufficient displacement to cause a tsunami. The shaking in earthquakes can also trigger landslides and occasionally volcanic activity.

    In its most generic sense, the word earthquake is used to describe any seismic event—whether a natural phenomenon or an event caused by humans—that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults, huge amounts of gas migration, mainly methane deep within the earth, but also by volcanic activity, landslides, mine blasts, and nuclear experiments.

  • 1 decade ago

    Underwater earthquakes do not actually cause the waves (called tsunamis)... they simple trigger the event that does cause them. Tsunamis are actually caused by underwater landslides, called turbidity currents, which displace a huge amount of water and force it upwards creating the wave.

  • abadie
    Lv 4
    3 years ago

    all of us understand why earthquakes take place interior the Bay area: 2 of the earth's greatest tectonic plates meet interior the location of the San Francisco Bay area. whilst boundary faults ruin, the North American and Pacific Plates roll unexpectedly and inconsistently previous one yet another and quakes take place. all of us understand that great and adverse earthquakes are advantageous to take place interior the destiny: a minimum of 8 faults interior the Bay area are able to producing earthquakes of fee 6.7 or greater. Such quakes could reason important harm to homes, roads, bridges, and utilities, ensuing in harm or demise to human beings interior the area.

  • 1 decade ago

    Try to down load my power point presentation. you will know A to Z about earthquakes and Tsunami. I am the one issued the warning 2 hours before Tsunami struck our coast. If you find difficult to down load my ppt file just type my name A.Ganapathy in google search engine you will find answers for hundres of questions connected with this subject.

    http://www.mediafire.com/?1bbdzzdml1e

    Source(s): My research work in early warning systems.
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