are earthquakes concentrated in any partiular regions and why are they in the areas of plat tectonics?

Answer 1

Convergent boundaries occur where two plates are being pushed together and collide. This is sometimes called a "destructive plate margin". One thing to keep in mind is that when subduction occurs, the denser plate (usually the older one) generally is considered to be the one that is pushed into the hot asthenosphere. Its rocks are melted and the resulting hot magma migrate upward along cracks and weakened areas in the overriding plate forming volcanoes. Of course, you always get earthquakes along with this process. The regions where the earthquakes occur are called the Wadati-Benioff zones. However, what actually happens depend on the composition of the crustal plates involved.

Oceanic colliding with continental crustal plates: An example of this is the subduction of the denser oceanic Nazca Plate under the South American Plate, pushing limestone strata upward to form the towering Andes and generating destructive earthquakes. Another example is the Cascadian subduction zone off the northwest coast of the U.S. you can find volcanoes along the subduction zones. Deep trenches are formed as a result of subduction.

Answer 2

I live in Memphis, TN and it is called the New Myriad fault. Back in the 1800's it caused the Mississippi river to flow backwards and made a lake called now Reel Foot, I guess because of the Indians that lived here at the time. It is because of the earth's layers of layers that move. I don't understand everything, but I have seen and know it is real.

Answer 3

Please visit my slide show at URL
http://asia.pg.photos.yahoo.com/ph/quake

You can understand about earthquakes and Tsunami